一個月多的ASP.NET+C#學習經驗

0.一些程式短語：
  string fdwmc=TextBox1.text.trim();

  ArrayList value=new ArrayList();
  value.Add("aaa");
  value.Add("bbb");

  Hashtable h=new Hashtable();
  h.Add("a1","a2");
  h.Add("b1","b2");
  
  StringBuilder s3 = new StringBuilder();
  s3.Append("hello");
  s3.Append(" world");
  s3.Append(" !!!");

00.HTML短語：
   <p> 則是代表段落標註
   <br>斷行標註,，這個標註不需要再寫一個對映的 </br>
   <font>標註：本標註用來設定文字的大小、顏色、字體
   <b> 粗體、<i> 斜體及 <u> 底線標註
   <h1>～<h6> 標題標註
   <blockquote>縮排標示
   <ol> 條列標註：(顯數字)
   <ul>條列標註：(顯。)
   <div> 段落對齊標註
   <!-- 這是批註, 給開發人員看的, 不會被解譯 -->
   <table> 標註用來表示表格的開始及結束
   <tr> 則表示其中行的開始及結束
   <td> 則表示一行中的字段
   <img src="Train.jpg">顯視圖形
   <a href="H10.htm>...</a><br>超級聯接

1.DataGrid自定義字段.
  <Column
    <asp:BoundColumn DataField="khbh" HeaderText="客戶編號"></asp:BoundColumn>
    <asp:BoundColumn DataField="khjc" HeaderText="客戶簡稱"><ItemStyle BackColor="#CCFFFF"></ItemStyle></asp:BoundColumn>
    <asp:BoundColumn DataField="dh" HeaderText="電話"></asp:BoundColumn>
    <asp:BoundColumn DataField="cjri" HeaderText="創建日期" DataFormatString="{0:yyyy-MM-dd}"></asp:BoundColumn>
    <asp:BoundColumn DataField="bycgl" HeaderText="月均出櫃量"></asp:BoundColumn>
    <asp:EditCommandColumn ButtonType="LinkButton" UpdateText="更新" CancelText="取消" EditText="編輯">
	<ItemStyle Font-Names="楷體_GB2312" Wrap="False" ForeColor="#339966"></ItemStyle>
	</asp:EditCommandColumn>
    <asp:ButtonColumn Text="刪除" CommandName="Delete"><ItemStyle Font-Names="楷體_GB2312" Wrap="False" ForeColor="#339966"></ItemStyle>
	</asp:ButtonColumn>
  </Columns>
  (DataGrid1.AutoGenerateColumns=False)

2.按一個控件後出一提示框選擇是否執行.
  private void Page_Load(object sender, System.EventArgs e)
  {
	// 在此處放置用戶代碼以初始化頁面
	Button1.Attributes["onClick"]="javascript:return confirm('確定嗎?');";

  }

3.一般提示框.
  private void Button1_Click(object sender, System.EventArgs e)
  {
      Response.Write("<script language='javascript'>alert('hellow');</script>");
  }

4.一般的DataGrid顯視數據過程:
  SqlConnection SqlConn;
  DataSet objDataSet=new DataSet();
  string Connstr="server=bserver;user=sa;database=SFA";
  string SQLstr="select * from khxx";
  SqlConn=new SqlConnection(Connstr);
  SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
  objAdapter.Fill(objDataSet,"khxx");
  DataGrid1.DataSource=objDataSet.Tables["khxx"].DefaultView;
  DataGrid1.DataBind();

5.在Web.config裏設好連接數據庫的字符串.
  //web.config
  </system.web>
   <appSettings>
     <add key="strConn" value="server=bserver;database=SFA;user=sa;"/>
   </appSettings>
  </configuration>
  //WebForm1.aspx
  using System.Configuration;
  string Connstr=ConfigurationSettings.AppSettings["strConn"];

6.分頁顯視數據:
  private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
  {
      DataGrid1.CurrentPageIndex=e.NewPageIndex;
      BindGrid();
  }

7.統一顯視數據函數:
  public void BindGrid()
  {
      SqlConnection SqlConn;
      DataSet objDataSet=new DataSet();
      string Connstr=ConfigurationSettings.AppSettings["strConn"];
      string SQLstr="select * from khxx";
      SqlConn=new SqlConnection(Connstr);
      SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
      objAdapter.Fill(objDataSet,"khxx");
      DataGrid1.DataSource=objDataSet.Tables["khxx"].DefaultView;
      DataGrid1.DataBind();
  }

回覆：

8.DataGrid數據編輯處理(一)_直接編輯
  private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
	DataGrid1.EditItemIndex=(int)e.Item.ItemIndex;
	BindGrid();
  }

  private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
	DataGrid1.EditItemIndex=-1;
	BindGrid();
  }

  private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
     DataGrid1.EditItemIndex=-1;	
			
     SqlConnection SqlConn;
     DataSet objDataSet=new DataSet();
     string Connstr=ConfigurationSettings.AppSettings["strConn"];
     string SQLstr="select * from khxx";
     SqlConn=new SqlConnection(Connstr);
     SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
     objAdapter.Fill(objDataSet,"khxx");

     TextBox CurrentText;
     CurrentText = (TextBox)e.Item.Cells[1].Controls[0];//取得文本框
     objDataSet.Tables["khxx"].Rows[(int)e.Item.ItemIndex]["khjc"]=CurrentText.Text;

     SqlCommandBuilder cb=new SqlCommandBuilder(objAdapter);
     SqlConn.Open();
     objAdapter.Update(objDataSet,"khxx");
     SqlConn.Close();

     DataGrid1.DataSource=objDataSet.Tables["khxx"];
     DataGrid1.DataBind();

   }
   在PageLoad()裏一定要if(Page.IsPostBack){....};
   DataGrid1.DataKeyField="khbh";

8.排序:
  private void DataGrid1_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
  {
	DataGrid1.EditItemIndex=-1;
	SqlConnection SqlConn;
	DataSet objDataSet=new DataSet();
	string Connstr=ConfigurationSettings.AppSettings["strConn"];
	string SQLstr="select * from khxx";
	SqlConn=new SqlConnection(Connstr);
	SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
	objAdapter.Fill(objDataSet,"khxx");

	DataTable objDataTable=objDataSet.Tables["khxx"];
	DataView objDataView=new DataView(objDataTable);
	objDataView.Sort=e.SortExpression;

	DataGrid1.DataSource=objDataView;
	DataGrid1.DataBind();
  }
  DataGrid1.AllowSorting=True;
  <asp:BoundColumn DataField="khbh" ReadOnly="True" HeaderText="客戶編號" SortExpression="khbh">
  <ItemStyle Wrap="False"></ItemStyle></asp:BoundColumn>

9.刪除一條記錄:
  private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
	SqlConnection SqlConn;
	DataSet objDataSet=new DataSet();
	string Connstr=ConfigurationSettings.AppSettings["strConn"];
	SqlConn=new SqlConnection(Connstr);

	string bh=DataGrid1.DataKeys[e.Item.ItemIndex].ToString();
	string SQLstr="delete from khxx where khbh='"+bh+"'";
        //int ProductID =(int)MyDataGrid.DataKeys[(int)E.Item.ItemIndex];
        //string SQLStatement="Delete Products WHERE ProductID="+ProductID;(當字段爲整數時)
			
	SqlCommand myCommand = new SqlCommand(SQLstr,SqlConn);

	myCommand.Connection.Open();
	myCommand.ExecuteNonQuery();
	myCommand.Connection.Close();

	BindGrid();
  }

10.刪除時提示是否刪除:
  <HEAD>
	.....	
	<script language="javascript">
	function delete_confirm(e) {
           if (event.srcElement.outerText=="刪除")
	   event.returnValue=confirm("確認刪除否？");
               }
           document.οnclick=delete_confirm;
	</script>
  </HEAD>

11.在DataGrid里加複選框.
  <Columns>
	<asp:TemplateColumn HeaderText="" ItemStyle-HorizontalAlign="Center">
		<ItemTemplate>
			<asp:CheckBox runat="server" ID="del" />
		</ItemTemplate>
	</asp:TemplateColumn>
        ......
  </Columns>

12.選中刪除多條記錄:
  private void Button1_Click(object sender, System.EventArgs e)
  {
	SqlConnection SqlConn;
	string Connstr=ConfigurationSettings.AppSettings["strConn"];
	SqlConn=new SqlConnection(Connstr);

	string DelString,SIDString="";
	for(int i=0;i<DataGrid1.Items.Count;i++)
	{
		CheckBox h;
		h=(CheckBox)DataGrid1.Items[i].Cells[0].Controls[1];
		if(h.Checked == true)
		{ //取得已選取的主鍵
			SIDString +=" or (khbh ='" + DataGrid1.Items[i].Cells[1].Text + "')";
		}
	}
	if(SIDString.Length>0)
	{
		SIDString=SIDString.Remove(0,4);
		DelString = "Delete from khxx where " + SIDString;
		SqlCommand DelRec = new SqlCommand(DelString,SqlConn);
		DelRec.Connection.Open();
		DelRec.ExecuteNonQuery();
		DelRec.Connection.Close();
		BindGrid();
	}
  }

13.不同WEB頁傳遞參數(前一個向後一個傳)：
  (WebForm1.aspx)
  private void Button2_Click(object sender, System.EventArgs e)
  {
	Response.Redirect("WebForm2.aspx@ID="+TextBox1.Text+"&NAME="+TextBox2.Text);
  }
  (WebForm2.aspx)
  private void Page_Load(object sender, System.EventArgs e)
  {
	string s;
	s=Request.QueryString["ID"];
	Label1.Text=s;
	s=Request.QueryString["NAME"];
	Label2.Text=s;		
  }

回覆：

14.增加一條記錄(一)：
        SqlConnection SqlConn;
        DataSet objDataSet=new DataSet();
	string Connstr=ConfigurationSettings.AppSettings["strConn"];
	string SQLstr="select * from khxx";
	SqlConn=new SqlConnection(Connstr);
	SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
	objAdapter.Fill(objDataSet,"khxx");

	DataRow row=objDataSet.Tables[0].NewRow();
	row["khbh"]=TextBox3.Text;
	row["khjc"]=TextBox4.Text;
	row["dh"]=TextBox5.Text;
	row["cjri"]=TextBox6.Text;
	row["bycgl"]=TextBox7.Text;

	objDataSet.Tables[0].Rows.Add(row);
	SqlCommandBuilder cb=new SqlCommandBuilder(objAdapter);
	objAdapter.Update(objDataSet,objDataSet.Tables[0].ToString());
	BindGrid();
15.代碼色之用：
   LinkButton1.ForeColor=ColorTranslator.FromHtml("#FF8000");

16.關於加載執行：
  protected void Page_Load(Object sender, EventArgs e) 
  { 
  // 網頁每次加載時，執行的一些操作 
    if (!IsPostBack) 
    { 
       // 網頁第一次加載時執行的操作 
    } 
    else 
    { 
      // 回送時執行的操作 
    } 

      // 網頁每次加載時執行的操作 
  } 

17.打開網頁時全屏顯視：
   （另加default.aspx,加入：)
  <script language="javascript">
  window.open('loadfile.aspx.html','_blank','menubar=no,location=no,toolbar=no,
  scrollbars=no,status=no,top=0,left=0,width=' + screen.width + ',height=' + screen.height); 
  window.opener = null;
  window.close();
  </script>

18.打開新的瀏覽器窗口:
  Response.Write("<SCRIPT language='javascript'> window.open('YOURURL')</SCRIPT>");

19.網頁啓動的時候彈出一個小窗體：
   在Page_Lod事件中加入：
   Response.Write("<script>window.open('newyear.htm','_blank','toolbar=no,location=no,directories=no,status=no,
   menubar=no,scrollbars=no,revisable=no,left=100,top=0,width=600,height=50')</" + "script>");
   彈出文件名：newyear.htm

20.Session的用法：
  //傳遞參數
  Session["markid"] = webform1.Text1.Value;
  Application["markid"] = webform1.Text1.Value;
  WebForm2.Text1.Value = Session["markid"].ToString();
  WebForm2.Text1.Value = Application["markid"].ToString();

  //清除
  Session.Remove("markid"); (session可以定義在webform1的任何地方。)

21.html控件：
   button光標移上移開的不同效果：
  <INPUT id="Button3" style="Z-INDEX: 111; LEFT: 248px; POSITION: absolute; 
  TOP: 456px" οnmοuseοver="this.style.color='red';"
  οnmοuseοut="this.style.color='black';" type="button" 
  value="text" name="Button3" runat="server">

22.cookie的用法：
  HttpCookie cookie = new HttpCookie("aspcn");
  cookie.Values.Add("webmaster","飛刀");
  cookie.Values.Add("writer","beige");
  cookie.Values.Add("LinkColor","blue");
  Response.AppendCookie(cookie);
  取出信息也一樣簡單
  HttpCookie cookie = Request.Cookies["aspcn"];
  value1 = cookies.Values["webmaster"];
  value2 = cookies.Values["writer"];

23.ASP.NET中文顯示之種幾種解決方法:
  (1)configuration>
      <globalization 
        requestencoding="utf-8" 
        responseencoding="utf-8" 
      /> 
    </configuration>  或"gb2312" 或"big5"
  (2)添加<%@ CODEPAGE = "936" %>到每一頁的開頭;

24.在線用戶統計:
  private void Page_Load(object sender, System.EventArgs e)
  {   
     Visitors.Text = Application["user_sessions"].ToString();
  }
  global.asax文件:
  protected void Application_Start(Object sender, EventArgs e)
  {
   Application["user_sessions"] = 0;
  }
  protected void Session_Start(Object sender, EventArgs e) 
  {
   Application.Lock();
   Application["user_sessions"] = (int)Application["user_sessions"] + 1;
   Application.Unlock();
  }
  protected void Session_End(Object sender, EventArgs e)
  {
    Application.Lock();
    Application["user_sessions"] = (int)Application["user_sessions"] - 1;
    Application.Unlock();
  }

25.DataSet的一種遍歷修改方法：
  SqlDataAdapter myCmd=new SqlDataAdapter(strSql,myConn);
  DataSet ds=new DataSet();
  myCmd.Fill(ds,"操作員");
  for(int i=0;i<ds.Tables[0].Rows.Count;i++)
  {
   if(ds.Tables[0].Rows[i]["Oper_state"].ToString()=="1")
    ds.Tables[0].Rows[i]["Oper_state"]="有效";
   else if(ds.Tables[0].Rows[i]["Oper_state"].ToString()=="0")
    ds.Tables[0].Rows[i]["Oper_state"]="凍結";
  }

26.自動刷新：
  <head>
  <!--每10秒自動刷新-->
  <meta http-equiv="refresh" content="10">
  </head>

27.ViewState的讀取：
  // 保存在 ViewState 中 
  ViewState["SortOrder"] = "DESC"; 
  // 從 ViewState 中讀取 
  string sortOrder = (string)ViewState["SortOrder"]; 

28.用Session傳遞DataSet:
  DataTable Dt=new DataTable();
  Dt=yourDataSet.Tables[yourtable].DefaultView;
  DataGrid1.DataSource=Dt;//yourDataSet是一個DataSet對象
  DataGrid1.DataBind();//假如你的“當前頁”的DataGrid是這樣邦定的
  Session["MyTable"]=Dt;
  另一頁(打印頁)：
  DataTable Dt2=new DataTable();
  Dt2=(DataTable)Session["MyTable"];
  DataGrid2.DataSource=Dt2;
  DataGrid2.DataBind();

29.超鏈接傳遞中文參數的問題:"list.aspx?name=" + Server.UrlEncode("中國");

30.Calendar的日期取出：
  private void Calendar1_SelectionChanged(object sender, System.EventArgs e)
  {
	TextBox1.Text=Calendar1.SelectedDate.ToShortDateString();
  }
  private void Calendar1_DayRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
  {
        ......		
  }

31.用DataTable在內存建表和加入數據方式一：
        DataTable dt=new DataTable();
	dt.Columns.Add(new DataColumn("編號",typeof(Int32)));
	dt.Columns.Add(new DataColumn("客戶",typeof(string)));
	DataRow dr;
	dr=dt.NewRow();
	dr[0]=9;
	dr[1]="custom";
	dt.Rows.Add(dr);
	DataGrid1.DataSource=new DataView(dt);

32.Hashtable表的用法：
  Hashtable h = new Hashtable();
  h.Add ("鍵 1", "值 1");
  h.Add ("鍵 2", "值 2");
  h.Add ("鍵 3", "值 3");
  MyDataList.DataSource = h;

33.通常的DataList模板應用：
  <ItemTemplate>
        編號：<%# DataBinder.Eval(Container.DataItem,"ID","{0:N2}") %><br>
	項：<%# DataBinder.Eval(Container.DataItem,"STRING") %><br>
	日期：<%# DataBinder.Eval(Container.DataItem,"DATETIME","{0:d}") %><br>
	是否：
	<asp:CheckBox ID="checkbox1" Checked='<%# DataBinder.Eval(Container.DataItem,"BOOL") %>' Runat=server /><br>
  </ItemTemplate>

34.使用 SqlDataReader的一般方法:
  SqlConnection myConnection = new SqlConnection(".......");
  SqlCommand myCommand = new SqlCommand("select * from Authors", myConnection);
  myConnection.Open();
  SqlDataReader dr = myCommand.ExecuteReader();
  MyDataGrid.DataSource = dr;
  MyDataGrid.DataBind();
  myConnection.Close();