GridView显示数据库图片与加入图片代码

 处理程序代码

<% @ WebHandler Language = " C# "  Class = " GetImg "   %>

using  System;
using  System.Web;
using  System.Data;
using  System.Data.SqlClient;
using  System.Drawing;
using  System.Drawing.Imaging;
using  System.IO;
using  System.Configuration;


/**/ /// 

/// GetImg 的摘要说明。
/// 

public   class  GetImg : IHttpHandler
... {
public void ProcessRequest(HttpContext context)
...{
string id = (string)context.Request["id"];

if (id != null)
...{

   
    MemoryStream stream = new MemoryStream();
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["testConnectionString"].ConnectionString);
Bitmap bm = null;
Image image = null;
try
...{
conn.Open();
SqlCommand cmd = new SqlCommand("select pic from image where id='" + id + "'", conn);
byte[] blob = (byte[])cmd.ExecuteScalar();
stream.Write(blob, 0, blob.Length);
bm = new Bitmap(stream);

int width = 58;
int height = (int)(width * ((double)bm.Height / (double)bm.Width));
// GetThumbnailImage生成缩略图
image = bm.GetThumbnailImage(width, height, null, IntPtr.Zero);

context.Response.ContentType = "image/jpeg";

image.Save(context.Response.OutputStream, ImageFormat.Jpeg);
}
finally
...{
if (image != null)
image.Dispose();
if (bm != null)
bm.Dispose();
stream.Close();
conn.Close();
}
}
}

// 实现成员接口(System.Web.IHttpHandler.IsReusable)
public bool IsReusable
...{
get
...{
return true;
}
}
}

 

加入图片到数据库,首先用VS建立存储过程

 

protected   void  Button2_Click( object  sender, EventArgs e)
     ... {
        FileStream fs = File.OpenRead(TextFile.Text);
        byte[] imageb = new byte[fs.Length];
        fs.Read(imageb, 0, imageb.Length);
        fs.Close();
        DataSet1TableAdapters.imageTableAdapter add = new DataSet1TableAdapters.imageTableAdapter();
        add.Insert(textName.Text, imageb);
        Response.Write("加入成功");
    }

 

页面上绑定代码

 

< ItemTemplate >
                             < asp:Image ID = " Image1 "  runat = " server "  ImageUrl = ' <%# "GetImg.ashx?ID=" + Eval("ID") %> '   />
                         ItemTemplate >