<%@ WebHandler Language="C#" Class="picHandler" %>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.IO;
using System.Data.SqlClient;
public class picHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.BufferOutput = false;
Stream outstream = null;
int photoId = -1;
if (context.Request.QueryString["PhotoID"] != null && context.Request.QueryString["PhotoID"] != "")
{
photoId = Convert.ToInt32(context.Request.QueryString["PhotoID"]);
outstream = GetPhoto(photoId);
}
const int buffersize = 1024*16;
byte[] buffer = new byte[buffersize];
int count = outstream.Read(buffer, 0, buffersize);
while (count > 0)
{
context.Response.OutputStream.Write(buffer, 0, count);
count = outstream.Read(buffer, 0, buffersize);
}
// context.Response.End();
}
public Stream GetPhoto(int photoId)
{
SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["Personal"].ConnectionString);
SqlCommand myCommand = new SqlCommand
("SELECT [Photo] FROM [Employees] WHERE [EmployeeID]=@EmployeeID",myConnection);
myCommand.CommandType = CommandType.Text;
myCommand.Parameters.Add(new SqlParameter("@EmployeeID", photoId));
myConnection.Open();
object result = myCommand.ExecuteScalar();
try {
return new MemoryStream((byte[])result);
}
catch (ArgumentNullException e) {
return null;
}
finally{
myConnection.Close();
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
调用<ItemTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl='<%# Bind("EmployeeID", "picHandler.ashx?PhotoId={0}") %>' />
</ItemTemplate>
