asp.net圖片上傳 ----上傳至數據庫---上傳至項目文件夾

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
namespace WebApplication4
{
    public partial class _Default : System.Web.UI.Page
    {
        string filename = "";      //文件名 
        string yanzhenggeshi = ""; //驗證文件擴展名 
        string path = "";          //上傳的文件路徑 
        System.Drawing.Image image; //畫圖 
        string url = "server=.;uid=sa;password=12345;database=pubs"; 
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                bandlist();
            }
        }
        //上傳至項目文件夾photo 
        protected void Button1_Click(object sender, EventArgs e)
        {
            string ss = yanzheng();
            if(ss!="ok")
            {
                MessageBox(ss);
                return;
            }
            Random random = new Random();
            int rand = random.Next(01,99);
            filename = DateTime.Now.ToString("yyMMddhhmmss")+rand;
            path = Server.MapPath("") + "/photo/" + filename + yanzhenggeshi;
            FileUpload1.PostedFile.SaveAs(path);
            image = System.Drawing.Image.FromFile(path);
            Bitmap bt = new Bitmap(image);
            try
            {
                bt.Save(Server.MapPath("") + "/photo/" + filename + yanzhenggeshi, ImageFormat.Jpeg);
                this.Button1.Enabled = false;
                this.Button2.Enabled = false;
            }
            catch(Exception )
            {}
            MessageBox("上傳ok！");
            this.Button1.Enabled = true;
            this.Button2.Enabled = true;
        }
        //上傳至數據庫 
        protected void Button2_Click(object sender, EventArgs e)
        {
            string ss = yanzheng();
            if (ss != "ok")
            {
                MessageBox(ss);
                return;
            }
            System.IO.Stream filestream = FileUpload1.PostedFile.InputStream;
            int filelength = FileUpload1.PostedFile.ContentLength;
            byte[] file = new byte[filelength];    
            filestream.Read(file, 0, filelength);  //讀取流 
            string up = upload(file);
            if (up == "ok")
            {
                MessageBox("上傳ok！");
            }
            else
            {
                MessageBox(up);
            }
        }
        //插入圖片 
        private string upload(object file)
        {
            SqlConnection con = new SqlConnection(url);
            string sql = "insert into photo(img) values(@img)";
            string msg = "";
            try
            {
                SqlCommand cmd = new SqlCommand(sql, con);
                con.Open();
                cmd.Parameters.AddWithValue("@img",file);
                int count = cmd.ExecuteNonQuery();
                if (count > 0)
                {
                    msg = "ok";
                    return msg;
                }
                else
                {
                    msg="error";
                    return msg;
                }
                con.Close();
            }
            catch (Exception ex)
            {
                msg=ex.Message.ToString();
                return msg;
            }
        }
        //驗證文件 
        private string yanzheng()
        {
            string ss = "";
            yanzhenggeshi = Path.GetExtension(FileUpload1.PostedFile.FileName).ToUpper();
            if (yanzhenggeshi == "" || yanzhenggeshi==null)
            {
                ss ="請選擇要上傳的文件";
                return ss;
            }
            if (yanzhenggeshi != ".JPG" && yanzhenggeshi != ".GIF")
            {
                ss = "格式不正確";
                return ss;
            }
            if (FileUpload1.PostedFile.ContentLength > 1048576) //不能大於1M 
            {
                ss = "圖片不能大於1M";
                return ss;
            }
            else
            {
                ss = "ok";
            }
            return ss;
        }
        //彈出對話框 
        private void MessageBox(string msg)
        {
            Response.Write("<script language='javascript'>alert('" + msg + "')</script>");
        }
        //顯示圖片 
        protected void Button3_Click(object sender, EventArgs e)
        {
            string id = this.DropDownList1.SelectedValue.ToString();
            SqlConnection con = new SqlConnection(url);
            string sql = " select img from photo where id = '"+id+"'";
            SqlCommand cmd = new SqlCommand(sql,con);
            con.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if(dr.Read())
            {
                Response.Clear();
                Response.BinaryWrite((byte[])dr["img"]);
            }
        }
        //綁定圖片列表框 
        private void bandlist()
        {
            SqlConnection con = new SqlConnection(url);
            DataSet ds = new DataSet();
            try
            {
                SqlDataAdapter dt = new SqlDataAdapter("select id from photo", con);
                con.Open();
                dt.Fill(ds);
                this.DropDownList1.DataSource = ds;
                this.DropDownList1.DataValueField = "id";
                this.DataBind();
            }catch(Exception ex)
            {
                MessageBox(ex.Message.ToString());
            }
            con.Close();
        }
    }
}
//SQL---數據表 
//if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[photo]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) 
//drop table [dbo].[photo] 
//GO 
//CREATE TABLE [dbo].[photo] ( 
//    [id] [int] IDENTITY (1001, 1) NOT NULL , 
//    [img] [image] NULL  
//) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] 
//GO 

aspx文件

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication4._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>無標題頁</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    <asp:FileUpload ID="FileUpload1" runat="server" />
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="上傳至項目文件夾" 
        Width="136px" />
    <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="上傳至數據庫" 
        Width="125px" />
    <asp:DropDownList ID="DropDownList1" runat="server" Height="25px" Width="123px">
    </asp:DropDownList>
    <asp:Button ID="Button3" runat="server" Height="25px" onclick="Button3_Click" 
        Text="顯示圖片" Width="104px" />
    </form>
</body>
</html>

asp.net圖片上傳 ----上傳至數據庫---上傳至項目文件夾

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