步驟01

2.操作步驟

在開始之前，要確保 Visual Studio 和 SQL Server Management Studio 已經安裝成功，並且SQL服務已經打開了。

2.1 建庫、建表

將下圖中的名字複製下來。後面的步驟中會用到。（DESKTOP-ADKCETM）

Y_strong

根據題目要求建立表結構。（注意這裏並沒有按照題目要求的設置性別字段的數據類型爲Char(4)，而是設置爲了Char(2)，因爲一箇中文佔2位）

然後將Oid設置爲主鍵，並將其設置爲自動增加。

（注意下圖中的Char(4)爲未修改之前，應該爲Char(2)，不要被下圖混淆了，我給上錯了圖。。。）

2.2 添加測試數據

設置好表的結構後，就點擊下圖中的刷新按鈕，然後再去選擇編輯前200行。

隨便添加幾條測試數據。
這裏先統一一下規則，就是姓名只能2-4箇中文，性別只能男或者女，電話是11位數字，後面的三個字段都是1-3位數字。會在B層進行邏輯判斷的時候，主要對描述的這些規則進行驗證。

2.3 在VS中創建項目

選擇ASP.NET Web應用程序（YYYDemo P_ULayer）

點擊確定

現在是這個樣子

在解決方案上右鍵—添加—新建項目。

選擇類庫項目。（P_BLayer）

同樣的步驟，再新建一個類庫項目。（P_DLayer）
現在的解決方案是下圖所示的情況。

2.4 添加引用

在P_ULayer項目中添加對P_BLayer項目的引用，在P_BLayer項目中添加對P_DLayer項目的引用。

U中添加對B的引用：

B中添加對D的引用：

現在是這個樣子：

修改程序集名稱和默認命名空間名稱

同樣的方法，修改B層和D層項目的這兩個屬性，都是修改爲 YYYDemo.XXX

2.5 添加類和頁面

①：B中添加類：

BLayer

②：同樣的方法，在D中添加一個類（DLayer）
③：在U層項目中，添加一個.aspx web窗體和一個.master母版頁
③-1：添加web窗體

ShowAll

③-2：添加母版頁

Site

完成上述操作，現在的結構應該是這樣的：

2.6 建立VS與SSMS的連接

現在將 “2.1 建庫、建表” 步驟中的名字拿過來

可以看到，連接已經建立。

把下圖的連接字符串複製下來
Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True

2.7 實現顯示功能

①：修改D_Layer.cs的代碼，把 “2.6 步驟” 中的連接字符串拿過來。
紅框爲新增或修改的代碼，後續的步驟中也是同樣的意思。

代碼如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }

        //關閉連接
        public void D_CloseConn()
        {
            CreateConnection().Close();
        }

        //獲取全部的賬戶信息，以DataSet數據類型返回
        public DataSet GetAllAccount_TO_DataSet()
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
    }
}

②：修改B_Layer的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Data;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗


namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);

        public DataSet GetAllAccount_TO_DataSet()
        {
            return new DLayer().GetAllAccount_TO_DataSet();
        }

        public void B_CloseConn()
        {
            new DLayer().D_CloseConn();
        }
    }
}

③-1：修改U層ShowAll頁面

然後到設計界面去修改GridView。

這個數據字段很關鍵，是跟數據表中的字段一一對應的，所以需要跟數據表中的字段的名稱一樣。
頁眉文本就是顯示在界面上的文本。

同樣的方法，添加如下幾列：

對應的GridView的代碼如下：
（那個SortExpression屬性可以刪掉，因爲我們並不使用它實現任何功能。）

截止到現在ShowAll.aspx的代碼

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ShowAll.aspx.cs" Inherits="P_ULayer.ShowAll" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>小區業主列表</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            
            <div id="Div_lbl_Topic">
                <asp:Label runat="server" ID="lbl_Topic" Text="小 區 業 主 列 表"></asp:Label>
            </div>
            
            <asp:GridView ID="gView" runat="server"
                AllowPaging="True"
                AutoGenerateColumns="False">
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="姓名" SortExpression="Name" />
                    <asp:BoundField DataField="Sex" HeaderText="性別" />
                    <asp:BoundField DataField="Phone" HeaderText="聯繫電話" SortExpression="Phone" />
                    <asp:BoundField DataField="BuildNum" HeaderText="樓號" SortExpression="BuildNum" />
                    <asp:BoundField DataField="Unit" HeaderText="單元" SortExpression="Unit" />
                    <asp:BoundField DataField="RoomNum" HeaderText="房間號" SortExpression="RoomNum" />
                </Columns>
            </asp:GridView>
        </div>
    </form>
</body>
</html>

編寫ShowAll.aspx.cs的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;

namespace P_ULayer
{
    public partial class ShowAll : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.gView.DataSource = new BLayer().GetAllAccount_TO_DataSet();
            this.gView.DataBind();
            new BLayer().B_CloseConn();
        }
    }
}

運行測試：（ 一定要讓VS當前活動窗口爲ShowAll.aspx或者是****ShowAll.aspx.cs纔可以摁下F5運行）

可以看到已經能夠正常顯示出數據表的信息了。

2.8 新建內容頁，並編輯母版頁和內容頁以及ShowAll頁的UI

①：編寫Site.Master

隱藏起來的table內容可以直接查看下面的代碼。

<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="P_ULayer.Site" %>

<!DOCTYPE html>

<html>
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <asp:ContentPlaceHolder ID="head" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <div id="Div_hLink_TO_01">
                <asp:HyperLink ID="hLink_TO_ShowAll" runat="server" NavigateUrl="~/ShowAll.aspx" Target="_self" Text="返回主頁"></asp:HyperLink>
            </div>
            

            <asp:ContentPlaceHolder ID="ContentPlaceHolder_DivLabel" runat="server">
            </asp:ContentPlaceHolder>

            <br />
            <br />

            <table id="tableUI">
                <tr>
                    <td style="width: 48%" class="td_Left">
                        <asp:Label ID="lbl_Name" runat="server" Text="姓名："></asp:Label>
                    </td>
                    <td style="width: 50%">
                        <asp:TextBox ID="textBox_Name" runat="server" Font-Size="16pt"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td class="td_Left">
                        <asp:Label ID="lbl_Sex" runat="server" Text="性別："></asp:Label>
                    </td>
                    <td>
                        <asp:RadioButton ID="radioBtn_Boy" runat="server" GroupName="Sex" Text="男" Checked="True" />
                        <asp:RadioButton ID="radioBtn_Girl" runat="server" GroupName="Sex" Text="女" />
                    </td>
                </tr>
                <tr>
                    <td class="td_Left">
                        <asp:Label ID="lbl_Phone" runat="server" Text="聯繫電話："></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="textBox_Phone" runat="server" Font-Size="16pt"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td class="td_Left">
                        <asp:Label ID="lbl_BuildNum" runat="server" Text="樓號："></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="textBox_BuildNum" runat="server" Font-Size="16pt"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td class="td_Left">
                        <asp:Label ID="lbl_Unit" runat="server" Text="單元："></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="textBox_Unit" runat="server" Font-Size="16pt"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td class="td_Left">
                        <asp:Label ID="lbl_RoomNum" runat="server" Text="房間號："></asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="textBox_RoomNum" runat="server" Font-Size="16pt"></asp:TextBox>
                    </td>
                </tr>
            </table>

            <br />
            <br />
            
            <asp:ContentPlaceHolder ID="ContentPlaceHolder_DivButton" runat="server">
            </asp:ContentPlaceHolder>
        </div>
    </form>
</body>
</html>

②：添加內容頁：

可以看到新建的內容頁爲下圖所示：

同樣的方法，再新建一個內容頁，然後修改兩個內容頁的名字，具體效果如下：

③：編輯內容頁的代碼
③-1：編輯後的AddAccount內容頁：

在設計界面，雙擊Button，爲其添加一個點擊事件。

下圖這個函數是雙擊後自動創建的

回到AddAccount這個內容頁的.aspx中，可以看到：

自動多了一個這個屬性。

截止到目前，AddAccount.aspx內容頁的代碼如下：

<%@ Page Title="新增業主" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="AddAccount.aspx.cs" Inherits="YYYDemo.P_ULayer.WebForm1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder_DivLabel" runat="server">
    <div id="Div_lbl_Topic">
        <asp:Label ID="lbl_Topic" runat="server" Text="新 增 業 主"></asp:Label>
    </div>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder_DivButton" runat="server">
    <div id="Div_btnSubmit">
        <asp:Button ID="btnSubmit" runat="server" class="CSS_class_btnSubmit" Text="提交" OnClick="btnSubmit_Click"/>
    </div>
</asp:Content>

③-2：跟③-1同樣的步驟，去修改AlterAccount內容頁的代碼。

截止到目前，AlterAccount.aspx的代碼：

<%@ Page Title="修改業主" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="AlterAccount.aspx.cs" Inherits="YYYDemo.P_ULayer.WebForm2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder_DivLabel" runat="server">
    <div id="Div_lbl_Topic">
        <asp:Label ID="lbl_Topic" runat="server" Text="修 改 業 主"></asp:Label>
    </div>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder_DivButton" runat="server">
    <div id="Div_btnSubmit">
        <asp:Button ID="btnSubmit" runat="server" Text="提交" class="CSS_class_btnSubmit" OnClick="btnSubmit_Click" />
    </div>
</asp:Content>

④：爲ShowAll頁面新加一個鏈接控件

截止到目前，ShowAll頁面的代碼：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ShowAll.aspx.cs" Inherits="P_ULayer.ShowAll" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>小區業主列表</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            
            <div id="Div_lbl_Topic">
                <asp:Label runat="server" ID="lbl_Topic" Text="小 區 業 主 列 表"></asp:Label>
            </div>
            
            <div>
                <br /><br />
                <asp:HyperLink Target="_self" NavigateUrl="~/AddAccount.aspx" runat="server" ID="hLink_AddAccount" Text="新增業主"></asp:HyperLink>
                <br /><br /><br /><br />
            </div>

            <asp:GridView ID="gView" runat="server"
                AllowPaging="True"
                AutoGenerateColumns="False">
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="姓名" SortExpression="Name" />
                    <asp:BoundField DataField="Sex" HeaderText="性別" />
                    <asp:BoundField DataField="Phone" HeaderText="聯繫電話" SortExpression="Phone" />
                    <asp:BoundField DataField="BuildNum" HeaderText="樓號" SortExpression="BuildNum" />
                    <asp:BoundField DataField="Unit" HeaderText="單元" SortExpression="Unit" />
                    <asp:BoundField DataField="RoomNum" HeaderText="房間號" SortExpression="RoomNum" />
                </Columns>
            </asp:GridView>
        </div>
    </form>
</body>
</html>

運行測試：

可以正常的進入到新增業主界面和返回主頁。

2.9 實現新增業主功能

先修改DLayer的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }

        //關閉連接
        public void D_CloseConn()
        {
            CreateConnection().Close();
        }

        //獲取全部的賬戶信息，以DataSet數據類型返回
        public DataSet GetAllAccount_TO_DataSet()
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
        
        //添加一個賬戶
        public void AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                "INSERT INTO owner(name,sex,phone,buildnum,unit,roomnum) " +
                "VALUES(N'{0}','{1}',N'{2}',N'{3}',N'{4}',N'{5}')"
                , name, sex, phone, buildNum, unit, roomNum),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

再修改BLayer的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Data;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗


namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);

        public DataSet GetAllAccount_TO_DataSet()
        {
            return new DLayer().GetAllAccount_TO_DataSet();
        }

        public void B_CloseConn()
        {
            new DLayer().D_CloseConn();
        }


        string errorStr = "";//這個也可以設置成局部變量，只不過讓RegularCheck_Add(Update)_TO_Bool函數多傳遞一個參數而已。
        //添加賬戶時正則表達式對輸入數據的驗證
        private bool RegularCheck_Add_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";//2-4箇中文
            string rStr_Phone = @"^\d{11}$";//11位數字
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";//1-3位數字

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            DataTable table = GetAllAccount_TO_DataSet().Tables[0];

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < table.Rows.Count; i++)
            {

                if (phone == table.Rows[i][3].ToString())
                    equal_Phone = true;

                if (
                    buildNum == table.Rows[i][4].ToString() &&
                    unit == table.Rows[i][5].ToString() &&
                    roomNum == table.Rows[i][6].ToString()
                    )
                    equal_Position = true;
            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }

            B_CloseConn();
            return flag;
        }

        //添加一個賬戶
        public string AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            if (RegularCheck_Add_TO_Bool(name, sex, phone, buildNum, unit, roomNum))
            {
                errorStr = "新增業主信息成功！";
                new DLayer().AddAnAccount(name, sex, phone, buildNum, unit, roomNum);
            }
            else
                errorStr += "\n新增業主信息失敗！";
            return errorStr;
        }
    }
}

修改AddAccount.aspx.cs文件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;

namespace YYYDemo.P_ULayer
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            char sex = '男';
            if ((Master.FindControl("radioBtn_Girl") as RadioButton).Checked)
                sex = '女';


            string message = new BLayer().AddAnAccount(
                        (Master.FindControl("textBox_Name") as TextBox).Text.ToString(),
                        sex,
                        (Master.FindControl("textBox_Phone") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_BuildNum") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_Unit") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_RoomNum") as TextBox).Text.ToString()
                        );
            BLayer.MessageBox(IntPtr.Zero, message, "提示！", 0);
        }
    }
}

Master.FindControl(“IDName”)
這個代碼的意思是通過id尋找在母版頁上的控件
BLayer.MessageBox(IntPtr.Zero, message, “提示！”, 0);
第二個參數(string 類型)表示的是提示框顯示的文本，第三個參數(string 類型)是提示框左上角的文本，第四個參數(int 類型)是按鈕的個數，0就是一個確定按鈕，1就是一個確定按鈕、一個取消按鈕（後面在刪除功能上用到）。

運行測試：
輸入正確數據的時候：

輸入錯誤數據的時候：

可以看到已經可以正常的進行驗證與添加，添加成功後去SQLserver上看一下表的數據，發現已經添加上了。

2.10 實現修改業主信息功能

先修改DLayer的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }

        //關閉連接
        public void D_CloseConn()
        {
            CreateConnection().Close();
        }

        //獲取全部的賬戶信息，以DataSet數據類型返回
        public DataSet GetAllAccount_TO_DataSet()
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
        
        //添加一個賬戶
        public void AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                "INSERT INTO owner(name,sex,phone,buildnum,unit,roomnum) " +
                "VALUES(N'{0}','{1}',N'{2}',N'{3}',N'{4}',N'{5}')"
                , name, sex, phone, buildNum, unit, roomNum),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }

        //通過手機號獲得一個賬戶的信息，以DataSet數據類型返回；
        //這個函數是爲了在B層通過手機號獲取賬戶的id
        public DataSet GetAnAccountByPhone_TO_DataSet(string phone)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE phone=N'{0}'", phone),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }

        //通過id獲得一個賬戶的信息，以DataSet數據類型返回
        public DataSet GetAnAccountByIndex_TO_DataSet(int index)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE Oid={0}", index),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }


        //修改一行信息
        public void UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                    "UPDATE owner SET name=N'{0}',sex='{1}',phone=N'{2}',buildnum=N'{3}',unit=N'{4}',roomnum=N'{5}' " +
                    "WHERE Oid={6}; ", name, sex, phone, buildNum, unit, roomNum, index),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

修改BLayer的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Data;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗


namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);

        public DataSet GetAllAccount_TO_DataSet()
        {
            return new DLayer().GetAllAccount_TO_DataSet();
        }

        public void B_CloseConn()
        {
            new DLayer().D_CloseConn();
        }


        string errorStr = "";//這個也可以設置成局部變量，只不過讓RegularCheck_Add(Update)_TO_Bool函數多傳遞一個參數而已。
        //添加賬戶時正則表達式對輸入數據的驗證
        private bool RegularCheck_Add_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";//2-4箇中文
            string rStr_Phone = @"^\d{11}$";//11位數字
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";//1-3位數字

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            DataTable table = GetAllAccount_TO_DataSet().Tables[0];

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < table.Rows.Count; i++)
            {

                if (phone == table.Rows[i][3].ToString())
                    equal_Phone = true;

                if (
                    buildNum == table.Rows[i][4].ToString() &&
                    unit == table.Rows[i][5].ToString() &&
                    roomNum == table.Rows[i][6].ToString()
                    )
                    equal_Position = true;
            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }

            B_CloseConn();
            return flag;
        }

        //添加一個賬戶
        public string AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            if (RegularCheck_Add_TO_Bool(name, sex, phone, buildNum, unit, roomNum))
            {
                errorStr = "新增業主信息成功！";
                new DLayer().AddAnAccount(name, sex, phone, buildNum, unit, roomNum);
            }
            else
                errorStr += "\n新增業主信息失敗！";
            return errorStr;
        }
        
        
        //通過手機號獲取該行數據的索引，爲下面的GetAnAccountByIndex_TO_DataSet()函數提供作用
        public int GetIndexByPhone_TO_Int(string phone)
        {
            return Convert.ToInt32(
                new DLayer().GetAnAccountByPhone_TO_DataSet(phone).Tables[0].Rows[0][0].ToString());
        }

        //通過索引獲取該行數據的全部信息，以DataSet數據類型返回
        public DataSet GetAnAccountByIndex_TO_DataSet(int index)
        {
            return new DLayer().GetAnAccountByIndex_TO_DataSet(index);
        }

        //修改一個賬戶的信息
        public string UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            if (RegularCheck_Update_TO_Bool(name, sex, phone, buildNum, unit, roomNum, index))
            {
                errorStr = "修改業主信息成功！";
                new DLayer().UpdateAnAccount(name, sex, phone, buildNum, unit, roomNum, index);
            }
            else
                errorStr += "\n修改業主信息失敗！";
            return errorStr;
        }



        //修改賬戶時正則表達式對輸入數據的驗證
        //修改個人信息，需要驗證 手機號 和 住房位置 是否 *跟別人* 重複；還需驗證數據是否合理
        private bool RegularCheck_Update_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";
            string rStr_Phone = @"^\d{11}$";
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            DataTable table = GetAllAccount_TO_DataSet().Tables[0];

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < table.Rows.Count; i++)
            {
                if (Convert.ToInt32(table.Rows[i][0].ToString())
                    != index)
                {
                    if (phone == table.Rows[i][3].ToString())
                        equal_Phone = true;

                    if (
                        buildNum == table.Rows[i][4].ToString() &&
                        unit == table.Rows[i][5].ToString() &&
                        roomNum == table.Rows[i][6].ToString()
                        )
                        equal_Position = true;
                }

            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }

            B_CloseConn();
            return flag;
        }

    }
}

修改ShowAll頁面的GridView控件的事件，雙擊下圖這兩個事件處，讓其自動添加兩個方法。

爲GridView添加兩列ButtonField列。

可以看到這一列已經出來了。
繼續編輯列。

將修改這一列的CommandName修改爲Y_Update

可以在ShowALl.aspx頁面的源碼上看到如下圖所示的代碼：

截止目前，ShowAll.aspx的代碼：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ShowAll.aspx.cs" Inherits="P_ULayer.ShowAll" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>小區業主列表</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            
            <div id="Div_lbl_Topic">
                <asp:Label runat="server" ID="lbl_Topic" Text="小 區 業 主 列 表"></asp:Label>
            </div>
            
            <div>
                <br /><br />
                <asp:HyperLink Target="_self" NavigateUrl="~/AddAccount.aspx" runat="server" ID="hLink_AddAccount" Text="新增業主"></asp:HyperLink>
                <br /><br /><br /><br />
            </div>

            <asp:GridView ID="gView" runat="server"
                AllowPaging="True"
                AutoGenerateColumns="False" OnPageIndexChanging="gView_PageIndexChanging" OnRowCommand="gView_RowCommand">
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="姓名" SortExpression="Name" />
                    <asp:BoundField DataField="Sex" HeaderText="性別" />
                    <asp:BoundField DataField="Phone" HeaderText="聯繫電話" SortExpression="Phone" />
                    <asp:BoundField DataField="BuildNum" HeaderText="樓號" SortExpression="BuildNum" />
                    <asp:BoundField DataField="Unit" HeaderText="單元" SortExpression="Unit" />
                    <asp:BoundField DataField="RoomNum" HeaderText="房間號" SortExpression="RoomNum" />
                    <asp:ButtonField CommandName="Y_Update" HeaderText="操作" ShowHeader="True" Text="修改" />
                </Columns>
            </asp:GridView>
        </div>
    </form>
</body>
</html>

繼續修改ShowAll.aspx.cs的代碼，在ShowAll頁面上實現換頁功能和跳轉到AlterAccount頁面的功能。

截止目前，ShowAll.aspx.cs的代碼：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;

namespace P_ULayer
{
    public partial class ShowAll : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.gView.DataSource = new BLayer().GetAllAccount_TO_DataSet();
            this.gView.DataBind();
            new BLayer().B_CloseConn();
        }

        protected void gView_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Y_Update" || e.CommandName == "Y_Delete")
            {
                //獲取 操作列 或者 刪除列 點擊的是GridView的哪一行
                int gViewSelect_Index = Convert.ToInt32(e.CommandArgument);
                //將點擊的這一行的手機號（因爲手機號不可重複）的業主的Oid字段的值傳給 全局變量 Application["Index"] 
                Application["Index"] = new BLayer().GetIndexByPhone_TO_Int(
                    this.gView.Rows[gViewSelect_Index].Cells[2].Text.ToString()
                    );

                //這個代碼塊也就是實現了 ： 點擊的哪一行 ---> 手機號 ---> Oid ---> Application["Index"]
            }

            if (e.CommandName == "Y_Update")
                Response.Redirect("AlterAccount.aspx");

            if (e.CommandName == "Y_Delete")
            {
                //TODO
            }

            new BLayer().B_CloseConn();
        }

        protected void gView_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            this.gView.PageIndex = e.NewPageIndex;
            gView.DataBind();
        }
    }
}

修改AlterAccount.cs的代碼：

運行測試：

沒問題

2.11 實現刪除業主信息功能

DLayer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }

        //關閉連接
        public void D_CloseConn()
        {
            CreateConnection().Close();
        }

        //獲取全部的賬戶信息，以DataSet數據類型返回
        public DataSet GetAllAccount_TO_DataSet()
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
        
        //添加一個賬戶
        public void AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                "INSERT INTO owner(name,sex,phone,buildnum,unit,roomnum) " +
                "VALUES(N'{0}','{1}',N'{2}',N'{3}',N'{4}',N'{5}')"
                , name, sex, phone, buildNum, unit, roomNum),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }

        //通過手機號獲得一個賬戶的信息，以DataSet數據類型返回；
        //這個函數是爲了在B層通過手機號獲取賬戶的id
        public DataSet GetAnAccountByPhone_TO_DataSet(string phone)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE phone=N'{0}'", phone),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }

        //通過id獲得一個賬戶的信息，以DataSet數據類型返回
        public DataSet GetAnAccountByIndex_TO_DataSet(int index)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE Oid={0}", index),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }


        //修改一行信息
        public void UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                    "UPDATE owner SET name=N'{0}',sex='{1}',phone=N'{2}',buildnum=N'{3}',unit=N'{4}',roomnum=N'{5}' " +
                    "WHERE Oid={6}; ", name, sex, phone, buildNum, unit, roomNum, index),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }

        //刪除一行信息
        public void DeleteAnAccount(int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format("DELETE FROM owner WHERE Oid = {0}", index),
                conn);
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

BLayer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Data;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗


namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);

        public DataSet GetAllAccount_TO_DataSet()
        {
            return new DLayer().GetAllAccount_TO_DataSet();
        }

        public void B_CloseConn()
        {
            new DLayer().D_CloseConn();
        }


        string errorStr = "";//這個也可以設置成局部變量，只不過讓RegularCheck_Add(Update)_TO_Bool函數多傳遞一個參數而已。
        //添加賬戶時正則表達式對輸入數據的驗證
        private bool RegularCheck_Add_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";//2-4箇中文
            string rStr_Phone = @"^\d{11}$";//11位數字
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";//1-3位數字

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            DataTable table = GetAllAccount_TO_DataSet().Tables[0];

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < table.Rows.Count; i++)
            {

                if (phone == table.Rows[i][3].ToString())
                    equal_Phone = true;

                if (
                    buildNum == table.Rows[i][4].ToString() &&
                    unit == table.Rows[i][5].ToString() &&
                    roomNum == table.Rows[i][6].ToString()
                    )
                    equal_Position = true;
            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }

            B_CloseConn();
            return flag;
        }

        //添加一個賬戶
        public string AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            if (RegularCheck_Add_TO_Bool(name, sex, phone, buildNum, unit, roomNum))
            {
                errorStr = "新增業主信息成功！";
                new DLayer().AddAnAccount(name, sex, phone, buildNum, unit, roomNum);
            }
            else
                errorStr += "\n新增業主信息失敗！";
            return errorStr;
        }
        
        
        //通過手機號獲取該行數據的索引，爲下面的GetAnAccountByIndex_TO_DataSet()函數提供作用
        public int GetIndexByPhone_TO_Int(string phone)
        {
            return Convert.ToInt32(
                new DLayer().GetAnAccountByPhone_TO_DataSet(phone).Tables[0].Rows[0][0].ToString());
        }

        //通過索引獲取該行數據的全部信息，以DataSet數據類型返回
        public DataSet GetAnAccountByIndex_TO_DataSet(int index)
        {
            return new DLayer().GetAnAccountByIndex_TO_DataSet(index);
        }

        //修改一個賬戶的信息
        public string UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            if (RegularCheck_Update_TO_Bool(name, sex, phone, buildNum, unit, roomNum, index))
            {
                errorStr = "修改業主信息成功！";
                new DLayer().UpdateAnAccount(name, sex, phone, buildNum, unit, roomNum, index);
            }
            else
                errorStr += "\n修改業主信息失敗！";
            return errorStr;
        }



        //修改賬戶時正則表達式對輸入數據的驗證
        //修改個人信息，需要驗證 手機號 和 住房位置 是否 *跟別人* 重複；還需驗證數據是否合理
        private bool RegularCheck_Update_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";
            string rStr_Phone = @"^\d{11}$";
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            DataTable table = GetAllAccount_TO_DataSet().Tables[0];

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < table.Rows.Count; i++)
            {
                if (Convert.ToInt32(table.Rows[i][0].ToString())
                    != index)
                {
                    if (phone == table.Rows[i][3].ToString())
                        equal_Phone = true;

                    if (
                        buildNum == table.Rows[i][4].ToString() &&
                        unit == table.Rows[i][5].ToString() &&
                        roomNum == table.Rows[i][6].ToString()
                        )
                        equal_Position = true;
                }

            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }

            B_CloseConn();
            return flag;
        }

        //刪除一個賬戶
        public string DeleteAnAccount(int index)
        {
            errorStr = "刪除業主信息成功！";
            new DLayer().DeleteAnAccount(index);
            return errorStr;
        }

    }
}

ShowAll.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ShowAll.aspx.cs" Inherits="P_ULayer.ShowAll" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>小區業主列表</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            
            <div id="Div_lbl_Topic">
                <asp:Label runat="server" ID="lbl_Topic" Text="小 區 業 主 列 表"></asp:Label>
            </div>
            
            <div>
                <br /><br />
                <asp:HyperLink Target="_self" NavigateUrl="~/AddAccount.aspx" runat="server" ID="hLink_AddAccount" Text="新增業主"></asp:HyperLink>
                <br /><br /><br /><br />
            </div>

            <asp:GridView ID="gView" runat="server"
                AllowPaging="True"
                AutoGenerateColumns="False" OnPageIndexChanging="gView_PageIndexChanging" OnRowCommand="gView_RowCommand">
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="姓名" SortExpression="Name" />
                    <asp:BoundField DataField="Sex" HeaderText="性別" />
                    <asp:BoundField DataField="Phone" HeaderText="聯繫電話" SortExpression="Phone" />
                    <asp:BoundField DataField="BuildNum" HeaderText="樓號" SortExpression="BuildNum" />
                    <asp:BoundField DataField="Unit" HeaderText="單元" SortExpression="Unit" />
                    <asp:BoundField DataField="RoomNum" HeaderText="房間號" SortExpression="RoomNum" />
                    <asp:ButtonField CommandName="Y_Update" HeaderText="操作" ShowHeader="True" Text="修改" />
                    <asp:ButtonField CommandName="Y_Delete" HeaderText="操作" ShowHeader="True" Text="刪除" />
                </Columns>
            </asp:GridView>
        </div>
    </form>
</body>
</html>

修改ShowAll.aspx.cs的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;

namespace P_ULayer
{
    public partial class ShowAll : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.gView.DataSource = new BLayer().GetAllAccount_TO_DataSet();
            this.gView.DataBind();
            new BLayer().B_CloseConn();
        }

        protected void gView_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Y_Update" || e.CommandName == "Y_Delete")
            {
                //獲取 操作列 或者 刪除列 點擊的是GridView的哪一行
                int gViewSelect_Index = Convert.ToInt32(e.CommandArgument);
                //將點擊的這一行的手機號（因爲手機號不可重複）的業主的Oid字段的值傳給 全局變量 Application["Index"] 
                Application["Index"] = new BLayer().GetIndexByPhone_TO_Int(
                    this.gView.Rows[gViewSelect_Index].Cells[2].Text.ToString()
                    );

                //這個代碼塊也就是實現了 ： 點擊的哪一行 ---> 手機號 ---> Oid ---> Application["Index"]
            }

            if (e.CommandName == "Y_Update")
                Response.Redirect("AlterAccount.aspx");

            if (e.CommandName == "Y_Delete")
            {
                if (BtnDelete() == 1)
                {
                    new BLayer().DeleteAnAccount(Convert.ToInt32(Application["Index"]));
                    Response.Redirect("ShowAll.aspx");
                }
            }

            new BLayer().B_CloseConn();
        }

        protected void gView_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            this.gView.PageIndex = e.NewPageIndex;
            gView.DataBind();
        }
        private int BtnDelete()
        {
            return BLayer.MessageBox(IntPtr.Zero, "確定要刪除這條數據嗎？", "警告！", 1);
        }
    }
}

運行測試：
我這裏先隨便添加了多條數據：

可以看到，換頁功能正常：

下面進行進行刪除操作：

正常

分割線一

截止到現在，已經完成了SQLserver數據庫上的增刪改查，樣式表我還沒怎麼添加，好像只是給修改和刪除頁面的TextBox添加了一個字體大小爲16pt的樣式。
接下來的部分我會添加樣式表和樣式，並且完成連接MySQL的操作。
可能還會添加實體類和對不同數據庫的支持，主題和皮膚功能也在預定之列吧。或許還會添加一個頭像。

以上內容完成後的當前時間：2019年5月22日00:32:39

2.12 添加實體類，替代DataSet傳遞數據

新建一個Entity類庫項目

修改Entity項目的程序集名稱和默認命名空間名稱

並添加一個Owner類

編輯Owner.cs的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace YYYDemo.Entity
{
    public class Owner
    {
        private int oid;
        private string name;
        private char sex;
        private string phone;
        private string buildNum;
        private string unit;
        private string roomNum;
        public int Oid
        {
            set { oid = value; }
            get { return oid; }
        }
        public string Name
        {
            set { name = value; }
            get { return name; }
        }
        public char Sex
        {
            set { sex = value; }
            get { return sex; }
        }
        public string Phone
        {
            set { phone = value; }
            get { return phone; }
        }
        public string BuildNum
        {
            set { buildNum = value; }
            get { return buildNum; }
        }
        public string Unit
        {
            set { unit = value; }
            get { return unit; }
        }
        public string RoomNum
        {
            set { roomNum = value; }
            get { return roomNum; }
        }
    }
}

添加引用，添加完後應該是下圖所示的情況：

修改D層的P_DLayer項目的DLayer類

修改B層的P_BLayer項目的BLayer類

修改U層的P_ULayer項目的ShowAll.aspx.cs

修改U層的P_ULayer項目的AlterAccount.aspx.cs 的代碼

運行測試，發現沒問題。

2.13 目前的代碼

1. 未刪減多餘代碼時：

DLayer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;
using YYYDemo.Entity;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }

        //關閉連接
        public void D_CloseConn()
        {
            CreateConnection().Close();
        }

        //獲取全部的賬戶信息，以DataSet數據類型返回
        public DataSet GetAllAccount_TO_DataSet()
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
        public IList<Owner> GetAllAccount()
        {
            List<Owner> owners = new List<Owner>();

            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            for (int i = 0; i < dSet.Tables[0].Rows.Count; i++)
            {
                Owner owner = new Owner();
                owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[i][0].ToString());
                owner.Name = dSet.Tables[0].Rows[i][1].ToString();
                owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[i][2].ToString());
                owner.Phone = dSet.Tables[0].Rows[i][3].ToString();
                owner.BuildNum = dSet.Tables[0].Rows[i][4].ToString();
                owner.Unit = dSet.Tables[0].Rows[i][5].ToString();
                owner.RoomNum = dSet.Tables[0].Rows[i][6].ToString();
                owners.Add(owner);
            }
            conn.Close();
            return owners;
        }

        //添加一個賬戶
        public void AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                "INSERT INTO owner(name,sex,phone,buildnum,unit,roomnum) " +
                "VALUES(N'{0}','{1}',N'{2}',N'{3}',N'{4}',N'{5}')"
                , name, sex, phone, buildNum, unit, roomNum),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
        

        //通過手機號獲得一個賬戶的信息，以DataSet數據類型返回；
        //這個函數是爲了在B層通過手機號獲取賬戶的id
        public DataSet GetAnAccountByPhone_TO_DataSet(string phone)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE phone=N'{0}'", phone),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
        public Owner GetAnAccountByPhone_TO_Owner(string phone)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE phone=N'{0}'", phone),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");

            Owner owner = new Owner();
            owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[0][0].ToString());
            owner.Name = dSet.Tables[0].Rows[0][1].ToString();
            owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[0][2].ToString());
            owner.Phone = dSet.Tables[0].Rows[0][3].ToString();
            owner.BuildNum = dSet.Tables[0].Rows[0][4].ToString();
            owner.Unit = dSet.Tables[0].Rows[0][5].ToString();
            owner.RoomNum = dSet.Tables[0].Rows[0][6].ToString();
            conn.Close();
            return owner;
        }

        //通過id獲得一個賬戶的信息，以DataSet數據類型返回
        public DataSet GetAnAccountByIndex_TO_DataSet(int index)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE Oid={0}", index),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            return dSet;
        }
        public Owner GetAnAccountByIndex_TO_Owner(int index)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE Oid={0}", index),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");

            Owner owner = new Owner();
            owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[0][0].ToString());
            owner.Name = dSet.Tables[0].Rows[0][1].ToString();
            owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[0][2].ToString());
            owner.Phone = dSet.Tables[0].Rows[0][3].ToString();
            owner.BuildNum = dSet.Tables[0].Rows[0][4].ToString();
            owner.Unit = dSet.Tables[0].Rows[0][5].ToString();
            owner.RoomNum = dSet.Tables[0].Rows[0][6].ToString();
            conn.Close();
            return owner;
        }


        //修改一行信息
        public void UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                    "UPDATE owner SET name=N'{0}',sex='{1}',phone=N'{2}',buildnum=N'{3}',unit=N'{4}',roomnum=N'{5}' " +
                    "WHERE Oid={6}; ", name, sex, phone, buildNum, unit, roomNum, index),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
        

        //刪除一行信息
        public void DeleteAnAccount(int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format("DELETE FROM owner WHERE Oid = {0}", index),
                conn);
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

BLayer：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Data;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗
using YYYDemo.Entity;

namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);

        public DataSet GetAllAccount_TO_DataSet()
        {
            return new DLayer().GetAllAccount_TO_DataSet();
        }
        public IList<Owner> GetAllAccount()
        {
            return new DLayer().GetAllAccount();
        }

        public void B_CloseConn()
        {
            new DLayer().D_CloseConn();
        }


        string errorStr = "";//這個也可以設置成局部變量，只不過讓RegularCheck_Add(Update)_TO_Bool函數多傳遞一個參數而已。
        //添加賬戶時正則表達式對輸入數據的驗證
        private bool RegularCheck_Add_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";//2-4箇中文
            string rStr_Phone = @"^\d{11}$";//11位數字
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";//1-3位數字

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            var owners = GetAllAccount();

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < owners.Count; i++)
            {

                if (phone == owners[i].Phone)
                    equal_Phone = true;

                if (
                    buildNum == owners[i].BuildNum &&
                    unit == owners[i].Unit &&
                    roomNum == owners[i].RoomNum
                    )
                    equal_Position = true;
            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }
            
            return flag;
        }
        
        //添加一個賬戶
        public string AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            if (RegularCheck_Add_TO_Bool(name, sex, phone, buildNum, unit, roomNum))
            {
                errorStr = "新增業主信息成功！";
                new DLayer().AddAnAccount(name, sex, phone, buildNum, unit, roomNum);
            }
            else
                errorStr += "\n新增業主信息失敗！";
            return errorStr;
        }
        
        //通過手機號獲取該行數據的索引，在U層中爲下面的GetAnAccountByIndex_TO_DataSet()函數提供作用
        public int GetIndexByPhone_TO_Int(string phone)
        {
            return Convert.ToInt32(
                new DLayer().GetAnAccountByPhone_TO_Owner(phone).Oid);
            //return Convert.ToInt32(
                //new DLayer().GetAnAccountByPhone_TO_DataSet(phone).Tables[0].Rows[0][0].ToString());
        }
        
        //通過索引獲取該行數據的全部信息，以DataSet數據類型返回
        public DataSet GetAnAccountByIndex_TO_DataSet(int index)
        {
            return new DLayer().GetAnAccountByIndex_TO_DataSet(index);
        }
        public Owner GetAnAccountBydIndex_TO_Owner(int index)
        {
            return new DLayer().GetAnAccountByIndex_TO_Owner(index);
        }
        
        //修改一個賬戶的信息
        public string UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            if (RegularCheck_Update_TO_Bool(name, sex, phone, buildNum, unit, roomNum, index))
            {
                errorStr = "修改業主信息成功！";
                new DLayer().UpdateAnAccount(name, sex, phone, buildNum, unit, roomNum, index);
            }
            else
                errorStr += "\n修改業主信息失敗！";
            return errorStr;
        }
        //修改賬戶時正則表達式對輸入數據的驗證
        //修改個人信息，需要驗證 手機號 和 住房位置 是否 *跟別人* 重複；還需驗證數據是否合理
        private bool RegularCheck_Update_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";
            string rStr_Phone = @"^\d{11}$";
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }
            
            var owners = GetAllAccount();

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < owners.Count; i++)
            {
                if (owners[i].Oid != index)
                {
                    if (phone == owners[i].Phone)
                        equal_Phone = true;

                    if (
                        buildNum == owners[i].BuildNum &&
                        unit == owners[i].Unit &&
                        roomNum == owners[i].RoomNum
                        )
                        equal_Position = true;
                }

            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }
            
            return flag;
        }
        
        //刪除一個賬戶
        public string DeleteAnAccount(int index)
        {
            errorStr = "刪除業主信息成功！";
            new DLayer().DeleteAnAccount(index);
            return errorStr;
        }

    }
}

ShowAll.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;

namespace P_ULayer
{
    public partial class ShowAll : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.gView.DataSource = new BLayer().GetAllAccount();
            this.gView.DataBind();
        }

        protected void gView_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Y_Update" || e.CommandName == "Y_Delete")
            {
                //獲取 操作列 或者 刪除列 點擊的是GridView的哪一行
                int gViewSelect_Index = Convert.ToInt32(e.CommandArgument);
                //將點擊的這一行的手機號（因爲手機號不可重複）的業主的Oid字段的值傳給 全局變量 Application["Index"] 
                Application["Index"] = new BLayer().GetIndexByPhone_TO_Int(
                    this.gView.Rows[gViewSelect_Index].Cells[2].Text.ToString()
                    );

                //這個代碼塊也就是實現了 ： 點擊的哪一行 ---> 手機號 ---> Oid ---> Application["Index"]
            }

            if (e.CommandName == "Y_Update")
                Response.Redirect("AlterAccount.aspx");

            if (e.CommandName == "Y_Delete")
            {
                if (BtnDelete() == 1)
                {
                    new BLayer().DeleteAnAccount(Convert.ToInt32(Application["Index"]));
                    Response.Redirect("ShowAll.aspx");
                }
            }
        }

        protected void gView_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            this.gView.PageIndex = e.NewPageIndex;
            gView.DataBind();
        }
        private int BtnDelete()
        {
            return BLayer.MessageBox(IntPtr.Zero, "確定要刪除這條數據嗎？", "警告！", 1);
        }
    }
}

Alteraccount.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

//using System.Data;
using YYYDemo.P_BLayer;
using YYYDemo.Entity;

namespace YYYDemo.P_ULayer
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //這裏若不加此判斷，則每次點擊未修改成功的按鈕後，頁面都會重傳，然後恢復一開始的值，不會保存修改的值
            if (!IsPostBack)
            {
                Owner owner = new BLayer().GetAnAccountBydIndex_TO_Owner(Convert.ToInt32(Application["Index"]));
               
                (Master.FindControl("textBox_Name") as TextBox).Text = owner.Name;
                if (owner.Sex == '男')
                    (Master.FindControl("radioBtn_Boy") as RadioButton).Checked = true;
                if (owner.Sex == '女')
                    (Master.FindControl("radioBtn_Girl") as RadioButton).Checked = true;
                (Master.FindControl("textBox_Phone") as TextBox).Text = owner.Phone;
                (Master.FindControl("textBox_BuildNum") as TextBox).Text = owner.BuildNum;
                (Master.FindControl("textBox_Unit") as TextBox).Text = owner.Unit;
                (Master.FindControl("textBox_RoomNum") as TextBox).Text = owner.RoomNum;
                
            }
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            char sex = '男';
            if ((Master.FindControl("radioBtn_Girl") as RadioButton).Checked)
                sex = '女';


            string message = new BLayer().UpdateAnAccount(
                        (Master.FindControl("textBox_Name") as TextBox).Text.ToString(),
                        sex,
                        (Master.FindControl("textBox_Phone") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_BuildNum") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_Unit") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_RoomNum") as TextBox).Text.ToString(),
                        Convert.ToInt32(Application["index"])
                        );
            BLayer.MessageBox(IntPtr.Zero, message, "提示！", 0);
        }
    }
}

2. 刪減多餘代碼後：

DLayer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;
using YYYDemo.Entity;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }
        //獲取全部的賬戶信息，以Owner實體類類型返回
        public IList<Owner> GetAllAccount()
        {
            List<Owner> owners = new List<Owner>();

            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            for (int i = 0; i < dSet.Tables[0].Rows.Count; i++)
            {
                Owner owner = new Owner();
                owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[i][0].ToString());
                owner.Name = dSet.Tables[0].Rows[i][1].ToString();
                owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[i][2].ToString());
                owner.Phone = dSet.Tables[0].Rows[i][3].ToString();
                owner.BuildNum = dSet.Tables[0].Rows[i][4].ToString();
                owner.Unit = dSet.Tables[0].Rows[i][5].ToString();
                owner.RoomNum = dSet.Tables[0].Rows[i][6].ToString();
                owners.Add(owner);
            }
            conn.Close();
            return owners;
        }
        //添加一個賬戶
        public void AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                "INSERT INTO owner(name,sex,phone,buildnum,unit,roomnum) " +
                "VALUES(N'{0}','{1}',N'{2}',N'{3}',N'{4}',N'{5}')"
                , name, sex, phone, buildNum, unit, roomNum),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
        //通過手機號獲得一個賬戶的信息，以Owner實體類類型返回；
        //這個函數是爲了在B層通過手機號獲取賬戶的id
        public Owner GetAnAccountByPhone_TO_Owner(string phone)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE phone=N'{0}'", phone),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");

            Owner owner = new Owner();
            owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[0][0].ToString());
            owner.Name = dSet.Tables[0].Rows[0][1].ToString();
            owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[0][2].ToString());
            owner.Phone = dSet.Tables[0].Rows[0][3].ToString();
            owner.BuildNum = dSet.Tables[0].Rows[0][4].ToString();
            owner.Unit = dSet.Tables[0].Rows[0][5].ToString();
            owner.RoomNum = dSet.Tables[0].Rows[0][6].ToString();
            conn.Close();
            return owner;
        }
        //通過id獲得一個賬戶的信息，以Owner實體類類型返回
        public Owner GetAnAccountByIndex_TO_Owner(int index)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE Oid={0}", index),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");

            Owner owner = new Owner();
            owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[0][0].ToString());
            owner.Name = dSet.Tables[0].Rows[0][1].ToString();
            owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[0][2].ToString());
            owner.Phone = dSet.Tables[0].Rows[0][3].ToString();
            owner.BuildNum = dSet.Tables[0].Rows[0][4].ToString();
            owner.Unit = dSet.Tables[0].Rows[0][5].ToString();
            owner.RoomNum = dSet.Tables[0].Rows[0][6].ToString();
            conn.Close();
            return owner;
        }
        //修改一行信息
        public void UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                    "UPDATE owner SET name=N'{0}',sex='{1}',phone=N'{2}',buildnum=N'{3}',unit=N'{4}',roomnum=N'{5}' " +
                    "WHERE Oid={6}; ", name, sex, phone, buildNum, unit, roomNum, index),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
        //刪除一行信息
        public void DeleteAnAccount(int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format("DELETE FROM owner WHERE Oid = {0}", index),
                conn);
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

BLayer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗
using YYYDemo.Entity;

namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);
        public IList<Owner> GetAllAccount()
        {
            return new DLayer().GetAllAccount();
        }
        string errorStr = "";//這個也可以設置成局部變量，只不過讓RegularCheck_Add(Update)_TO_Bool函數多傳遞一個參數而已。
        //添加賬戶時正則表達式對輸入數據的驗證
        private bool RegularCheck_Add_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";//2-4箇中文
            string rStr_Phone = @"^\d{11}$";//11位數字
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";//1-3位數字

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            var owners = GetAllAccount();

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < owners.Count; i++)
            {

                if (phone == owners[i].Phone)
                    equal_Phone = true;

                if (
                    buildNum == owners[i].BuildNum &&
                    unit == owners[i].Unit &&
                    roomNum == owners[i].RoomNum
                    )
                    equal_Position = true;
            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }
            
            return flag;
        }
        //添加一個賬戶
        public string AddAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum)
        {
            if (RegularCheck_Add_TO_Bool(name, sex, phone, buildNum, unit, roomNum))
            {
                errorStr = "新增業主信息成功！";
                new DLayer().AddAnAccount(name, sex, phone, buildNum, unit, roomNum);
            }
            else
                errorStr += "\n新增業主信息失敗！";
            return errorStr;
        }
        //通過手機號獲取該行數據的索引，在U層中爲下面的GetAnAccountByIndex_TO_DataSet()函數提供作用
        public int GetIndexByPhone_TO_Int(string phone)
        {
            return Convert.ToInt32(
                new DLayer().GetAnAccountByPhone_TO_Owner(phone).Oid);
        }
        //通過索引獲取該行數據的全部信息，以Owner實體類類型返回
        public Owner GetAnAccountBydIndex_TO_Owner(int index)
        {
            return new DLayer().GetAnAccountByIndex_TO_Owner(index);
        }
        //修改一個賬戶的信息
        public string UpdateAnAccount(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            if (RegularCheck_Update_TO_Bool(name, sex, phone, buildNum, unit, roomNum, index))
            {
                errorStr = "修改業主信息成功！";
                new DLayer().UpdateAnAccount(name, sex, phone, buildNum, unit, roomNum, index);
            }
            else
                errorStr += "\n修改業主信息失敗！";
            return errorStr;
        }
        //修改賬戶時正則表達式對輸入數據的驗證
        //修改個人信息，需要驗證 手機號 和 住房位置 是否 *跟別人* 重複；還需驗證數據是否合理
        private bool RegularCheck_Update_TO_Bool(string name, char sex, string phone, string buildNum, string unit, string roomNum, int index)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";
            string rStr_Phone = @"^\d{11}$";
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";

            if (!Regex.IsMatch(name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(buildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(roomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }
            
            var owners = GetAllAccount();

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < owners.Count; i++)
            {
                if (owners[i].Oid != index)
                {
                    if (phone == owners[i].Phone)
                        equal_Phone = true;

                    if (
                        buildNum == owners[i].BuildNum &&
                        unit == owners[i].Unit &&
                        roomNum == owners[i].RoomNum
                        )
                        equal_Position = true;
                }

            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }
            
            return flag;
        }
        //刪除一個賬戶
        public string DeleteAnAccount(int index)
        {
            errorStr = "刪除業主信息成功！";
            new DLayer().DeleteAnAccount(index);
            return errorStr;
        }

    }
}

ShowAll.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;

namespace P_ULayer
{
    public partial class ShowAll : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.gView.DataSource = new BLayer().GetAllAccount();
            this.gView.DataBind();
        }

        protected void gView_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Y_Update" || e.CommandName == "Y_Delete")
            {
                //獲取 操作列 或者 刪除列 點擊的是GridView的哪一行
                int gViewSelect_Index = Convert.ToInt32(e.CommandArgument);
                //將點擊的這一行的手機號（因爲手機號不可重複）的業主的Oid字段的值傳給 全局變量 Application["Index"] 
                Application["Index"] = new BLayer().GetIndexByPhone_TO_Int(
                    this.gView.Rows[gViewSelect_Index].Cells[2].Text.ToString()
                    );

                //這個代碼塊也就是實現了 ： 點擊的哪一行 ---> 手機號 ---> Oid ---> Application["Index"]
            }

            if (e.CommandName == "Y_Update")
                Response.Redirect("AlterAccount.aspx");

            if (e.CommandName == "Y_Delete")
            {
                if (BtnDelete() == 1)
                {
                    new BLayer().DeleteAnAccount(Convert.ToInt32(Application["Index"]));
                    Response.Redirect("ShowAll.aspx");
                }
            }
        }

        protected void gView_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            this.gView.PageIndex = e.NewPageIndex;
            gView.DataBind();
        }
        private int BtnDelete()
        {
            return BLayer.MessageBox(IntPtr.Zero, "確定要刪除這條數據嗎？", "警告！", 1);
        }
    }
}

AlterAccount.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;
using YYYDemo.Entity;

namespace YYYDemo.P_ULayer
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //這裏若不加此判斷，則每次點擊未修改成功的按鈕後，頁面都會重傳，然後恢復一開始的值，不會保存修改的值
            if (!IsPostBack)
            {
                Owner owner = new BLayer().GetAnAccountBydIndex_TO_Owner(Convert.ToInt32(Application["Index"]));
               
                (Master.FindControl("textBox_Name") as TextBox).Text = owner.Name;
                if (owner.Sex == '男')
                    (Master.FindControl("radioBtn_Boy") as RadioButton).Checked = true;
                if (owner.Sex == '女')
                    (Master.FindControl("radioBtn_Girl") as RadioButton).Checked = true;
                (Master.FindControl("textBox_Phone") as TextBox).Text = owner.Phone;
                (Master.FindControl("textBox_BuildNum") as TextBox).Text = owner.BuildNum;
                (Master.FindControl("textBox_Unit") as TextBox).Text = owner.Unit;
                (Master.FindControl("textBox_RoomNum") as TextBox).Text = owner.RoomNum;
                
            }
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            char sex = '男';
            if ((Master.FindControl("radioBtn_Girl") as RadioButton).Checked)
                sex = '女';


            string message = new BLayer().UpdateAnAccount(
                        (Master.FindControl("textBox_Name") as TextBox).Text.ToString(),
                        sex,
                        (Master.FindControl("textBox_Phone") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_BuildNum") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_Unit") as TextBox).Text.ToString(),
                        (Master.FindControl("textBox_RoomNum") as TextBox).Text.ToString(),
                        Convert.ToInt32(Application["index"])
                        );
            BLayer.MessageBox(IntPtr.Zero, message, "提示！", 0);
        }
    }
}

運行測試，都正常

注：

添加實體類後，修改DLayer的代碼，是將以DataSet爲返回值的函數作爲想要修改的函數去修改
修改完代碼後，要保證，除了在D層的DLayer代碼有 System.Data 的引用後，其餘各層均沒有

把多餘的Class1刪掉，現在的結構是下圖所示：

在不適用實體類的時候，GridView的列的DataField的值必須對應數據表中的字段的名稱，若數據表的結構修改，則程序會報錯。
現在使用上了實體類之後，U層的GridView 的列的DataField 的值是對應了實體類的屬性名稱，這裏雖然沒變，是因爲我在設計實體類的時候，寫實體類的屬性名稱是仿照着數據表的字段名稱來的，所以這裏的DataField的值雖然沒變，但是其實是已經映射到了實體類的屬性名稱上，而不是數據表的字段名稱上。
也就是說，比如我將實體類的Name屬性的名稱修改爲MMMM，然後在DLayer和AlterAccount頁面上用到該實體類的Name屬性的地方全部修改爲MMMM，最後將ShowAll頁面的GridView的某一列的DataField屬性的值設置爲MMMM，則程序正常運行。

2.14 繼續修改代碼，將D層的新增和修改函數的形參修改爲Owner實體類對象

D層項目：
將一連串的形參修改爲了一個Owner類型的形參

B層項目：

同樣的，修改B層的AlterAccount函數，也是需要像AddAccount函數一樣去改變形參。
接下來就不上圖了，直接放B層和D層目前的代碼。

B層BLayer：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using YYYDemo.P_DLayer;
using System.Text.RegularExpressions;//正則表達式
using System.Runtime.InteropServices;//爲了實現一個彈窗
using YYYDemo.Entity;

namespace YYYDemo.P_BLayer
{
    public class BLayer
    {
        //提示框，這兩行照着寫上即可，不必理解原理，會使用就行
        [DllImport("User32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern int MessageBox(IntPtr handle, String message, String title, int type);
        public IList<Owner> GetAllAccount()
        {
            return new DLayer().GetAllAccount();
        }
        string errorStr = "";//這個也可以設置成局部變量，只不過讓RegularCheck_Add(Update)_TO_Bool函數多傳遞一個參數而已。
        //添加賬戶時正則表達式對輸入數據的驗證
        private bool RegularCheck_Add_TO_Bool(Owner _owner)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";//2-4箇中文
            string rStr_Phone = @"^\d{11}$";//11位數字
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";//1-3位數字

            if (!Regex.IsMatch(_owner.Name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.Phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.BuildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.Unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.RoomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }

            var owners = GetAllAccount();

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < owners.Count; i++)
            {

                if (_owner.Phone == owners[i].Phone)
                    equal_Phone = true;

                if (
                    _owner.BuildNum == owners[i].BuildNum &&
                    _owner.Unit == owners[i].Unit &&
                    _owner.RoomNum == owners[i].RoomNum
                    )
                    equal_Position = true;
            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }
            
            return flag;
        }
        //添加一個賬戶
        public string AddAnAccount(Owner owner)
        {
            if (RegularCheck_Add_TO_Bool(owner))
            {
                errorStr = "新增業主信息成功！";
                new DLayer().AddAnAccount(owner);
            }
            else
                errorStr += "\n新增業主信息失敗！";
            return errorStr;
        }
        //通過手機號獲取該行數據的索引，在U層中爲下面的GetAnAccountByIndex_TO_DataSet()函數提供作用
        public int GetIndexByPhone_TO_Int(string phone)
        {
            return Convert.ToInt32(
                new DLayer().GetAnAccountByPhone_TO_Owner(phone).Oid);
        }
        //通過索引獲取該行數據的全部信息，以Owner實體類類型返回
        public Owner GetAnAccountBydIndex_TO_Owner(int index)
        {
            return new DLayer().GetAnAccountByIndex_TO_Owner(index);
        }
        //修改賬戶時正則表達式對輸入數據的驗證
        //修改個人信息，需要驗證 手機號 和 住房位置 是否 *跟別人* 重複；還需驗證數據是否合理
        private bool RegularCheck_Update_TO_Bool(Owner _owner)
        {
            errorStr = "";
            bool flag = true;
            string rStr_Name = "^[\u4e00-\u9fa5]{2,4}$";
            string rStr_Phone = @"^\d{11}$";
            string rStr_BuildNum_Unit_RoomNum = @"^\d{1,3}$";

            if (!Regex.IsMatch(_owner.Name, rStr_Name))
            {
                errorStr += "姓名應爲2-4個漢字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.Phone, rStr_Phone))
            {
                errorStr += "號碼應爲11位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.BuildNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "樓號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.Unit, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "單元號應爲1-3位數字！\n";
                flag = false;
            }
            if (!Regex.IsMatch(_owner.RoomNum, rStr_BuildNum_Unit_RoomNum))
            {
                errorStr += "房間號應爲1-3位數字！\n";
                flag = false;
            }
            
            var owners = GetAllAccount();

            bool equal_Phone = false;
            bool equal_Position = false;

            for (int i = 0; i < owners.Count; i++)
            {
                if (owners[i].Oid != _owner.Oid)
                {
                    if (_owner.Phone == owners[i].Phone)
                        equal_Phone = true;

                    if (
                        _owner.BuildNum == owners[i].BuildNum &&
                        _owner.Unit == owners[i].Unit &&
                        _owner.RoomNum == owners[i].RoomNum
                        )
                        equal_Position = true;
                }

            }
            if (equal_Phone)
            {
                errorStr += "聯繫電話不能重複！\n";
                flag = false;
            }
            if (equal_Position)
            {
                errorStr += "住房位置不能重複！\n";
                flag = false;
            }
            
            return flag;
        }
        //修改一個賬戶的信息
        public string UpdateAnAccount(Owner owner)
        {
            if (RegularCheck_Update_TO_Bool(owner))
            {
                errorStr = "修改業主信息成功！";
                new DLayer().UpdateAnAccount(owner);
            }
            else
                errorStr += "\n修改業主信息失敗！";
            return errorStr;
        }
        //刪除一個賬戶
        public string DeleteAnAccount(int index)
        {
            errorStr = "刪除業主信息成功！";
            new DLayer().DeleteAnAccount(index);
            return errorStr;
        }

    }
}

D層DLayer：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Data;
using System.Data.SqlClient;
using YYYDemo.Entity;

namespace YYYDemo.P_DLayer
{
    public class DLayer
    {
        //創建數據庫連接
        private SqlConnection CreateConnection()
        {
            return new SqlConnection(
                "Data Source=DESKTOP-ADKCETM;Initial Catalog=Y_strong;Integrated Security=True"
                );
        }
        //獲取全部的賬戶信息，以Owner實體類類型返回
        public IList<Owner> GetAllAccount()
        {
            List<Owner> owners = new List<Owner>();

            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                "SELECT * FROM owner", conn
                );
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");
            for (int i = 0; i < dSet.Tables[0].Rows.Count; i++)
            {
                Owner owner = new Owner();
                owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[i][0].ToString());
                owner.Name = dSet.Tables[0].Rows[i][1].ToString();
                owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[i][2].ToString());
                owner.Phone = dSet.Tables[0].Rows[i][3].ToString();
                owner.BuildNum = dSet.Tables[0].Rows[i][4].ToString();
                owner.Unit = dSet.Tables[0].Rows[i][5].ToString();
                owner.RoomNum = dSet.Tables[0].Rows[i][6].ToString();
                owners.Add(owner);
            }
            conn.Close();
            return owners;
        }
        //添加一個賬戶
        public void AddAnAccount(Owner owner)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                "INSERT INTO owner(name,sex,phone,buildnum,unit,roomnum) " +
                "VALUES(N'{0}','{1}',N'{2}',N'{3}',N'{4}',N'{5}')"
                , owner.Name, owner.Sex, owner.Phone, owner.BuildNum, owner.Unit, owner.RoomNum),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
        //通過手機號獲得一個賬戶的信息，以Owner實體類類型返回；
        //這個函數是爲了在B層通過手機號獲取賬戶的id
        public Owner GetAnAccountByPhone_TO_Owner(string phone)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE phone=N'{0}'", phone),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");

            Owner owner = new Owner();
            owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[0][0].ToString());
            owner.Name = dSet.Tables[0].Rows[0][1].ToString();
            owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[0][2].ToString());
            owner.Phone = dSet.Tables[0].Rows[0][3].ToString();
            owner.BuildNum = dSet.Tables[0].Rows[0][4].ToString();
            owner.Unit = dSet.Tables[0].Rows[0][5].ToString();
            owner.RoomNum = dSet.Tables[0].Rows[0][6].ToString();
            conn.Close();
            return owner;
        }
        //通過id獲得一個賬戶的信息，以Owner實體類類型返回
        public Owner GetAnAccountByIndex_TO_Owner(int index)
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlDataAdapter dAdp = new SqlDataAdapter(
                string.Format("SELECT * FROM owner WHERE Oid={0}", index),
                conn);
            DataSet dSet = new DataSet();
            dAdp.Fill(dSet, "owner");

            Owner owner = new Owner();
            owner.Oid = Convert.ToInt32(dSet.Tables[0].Rows[0][0].ToString());
            owner.Name = dSet.Tables[0].Rows[0][1].ToString();
            owner.Sex = Convert.ToChar(dSet.Tables[0].Rows[0][2].ToString());
            owner.Phone = dSet.Tables[0].Rows[0][3].ToString();
            owner.BuildNum = dSet.Tables[0].Rows[0][4].ToString();
            owner.Unit = dSet.Tables[0].Rows[0][5].ToString();
            owner.RoomNum = dSet.Tables[0].Rows[0][6].ToString();
            conn.Close();
            return owner;
        }
        //修改一行信息
        public void UpdateAnAccount(Owner owner)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format(
                    "UPDATE owner SET name=N'{0}',sex='{1}',phone=N'{2}',buildnum=N'{3}',unit=N'{4}',roomnum=N'{5}' " +
                    "WHERE Oid={6}; ", owner.Name, owner.Sex, owner.Phone, owner.BuildNum, owner.Unit, owner.RoomNum, owner.Oid),
                conn
                );
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
        //刪除一行信息
        public void DeleteAnAccount(int index)
        {
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = new SqlCommand(
                string.Format("DELETE FROM owner WHERE Oid = {0}", index),
                conn);
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                conn.Close();
            }
        }
    }
}

修改U層的新增和修改部分的代碼：

AddAccount.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;
using YYYDemo.Entity;

namespace YYYDemo.P_ULayer
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            char sex = '男';
            if ((Master.FindControl("radioBtn_Girl") as RadioButton).Checked)
                sex = '女';

            Owner owner = new Owner();

            owner.Name = (Master.FindControl("textBox_Name") as TextBox).Text.ToString();
            owner.Sex = sex;
            owner.Phone = (Master.FindControl("textBox_Phone") as TextBox).Text.ToString();
            owner.BuildNum = (Master.FindControl("textBox_BuildNum") as TextBox).Text.ToString();
            owner.Unit = (Master.FindControl("textBox_Unit") as TextBox).Text.ToString();
            owner.RoomNum = (Master.FindControl("textBox_RoomNum") as TextBox).Text.ToString();

            string message = new BLayer().AddAnAccount(owner);
            BLayer.MessageBox(IntPtr.Zero, message, "提示！", 0);
        }
    }
}

AlterAccount.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using YYYDemo.P_BLayer;
using YYYDemo.Entity;

namespace YYYDemo.P_ULayer
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //這裏若不加此判斷，則每次點擊未修改成功的按鈕後，頁面都會重傳，然後恢復一開始的值，不會保存修改的值
            if (!IsPostBack)
            {
                Owner owner = new BLayer().GetAnAccountBydIndex_TO_Owner(Convert.ToInt32(Application["Index"]));
               
                (Master.FindControl("textBox_Name") as TextBox).Text = owner.Name;
                if (owner.Sex == '男')
                    (Master.FindControl("radioBtn_Boy") as RadioButton).Checked = true;
                if (owner.Sex == '女')
                    (Master.FindControl("radioBtn_Girl") as RadioButton).Checked = true;
                (Master.FindControl("textBox_Phone") as TextBox).Text = owner.Phone;
                (Master.FindControl("textBox_BuildNum") as TextBox).Text = owner.BuildNum;
                (Master.FindControl("textBox_Unit") as TextBox).Text = owner.Unit;
                (Master.FindControl("textBox_RoomNum") as TextBox).Text = owner.RoomNum;
                
            }
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            char sex = '男';
            if ((Master.FindControl("radioBtn_Girl") as RadioButton).Checked)
                sex = '女';

            Owner owner = new Owner();

            owner.Oid = Convert.ToInt32(Application["index"]);
            owner.Name = (Master.FindControl("textBox_Name") as TextBox).Text.ToString();
            owner.Sex = sex;
            owner.Phone = (Master.FindControl("textBox_Phone") as TextBox).Text.ToString();
            owner.BuildNum = (Master.FindControl("textBox_BuildNum") as TextBox).Text.ToString();
            owner.Unit = (Master.FindControl("textBox_Unit") as TextBox).Text.ToString();
            owner.RoomNum = (Master.FindControl("textBox_RoomNum") as TextBox).Text.ToString();

            string message = new BLayer().UpdateAnAccount(owner);
            BLayer.MessageBox(IntPtr.Zero, message, "提示！", 0);
        }
    }
}

運行，測試功能，沒問題。

分割線二

到這裏已經實現實現了實體類。

2019年5月22日23:39:08

從零開始完成一個三層架構案例-2(步驟01)

步驟01

2.操作步驟

2.1 建庫、建表

2.2 添加測試數據

2.3 在VS中創建項目

2.4 添加引用

2.5 添加類和頁面

2.6 建立VS與SSMS的連接

2.7 實現顯示功能

2.8 新建內容頁，並編輯母版頁和內容頁以及ShowAll頁的UI

2.9 實現新增業主功能

2.10 實現修改業主信息功能

2.11 實現刪除業主信息功能

分割線一

2.12 添加實體類，替代DataSet傳遞數據

2.13 目前的代碼

1. 未刪減多餘代碼時：

2. 刪減多餘代碼後：

2.14 繼續修改代碼，將D層的新增和修改函數的形參修改爲Owner實體類對象

分割線二

使用c#強大的表達式樹實現對象的深克隆之解決循環引用的問題

痞子衡嵌入式：恩智浦i.MX RT1xxx系列MCU啓動那些事（12.A）- uSDHC eMMC啓動時間(RT1170)

本地SSL證書過期輸入命令在IIS自動生成

.NET週刊【5月第2期 2024-05-12】

從零開始完成一個三層架構案例-2(步驟01)

從零開始完成一個三層架構案例-3(步驟02)

從零開始完成一個三層架構案例-1

C#項目連接MySQL數據庫

C和C++中的 typedef struct 和 struct

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