namespace CustomHander
{
/// <summary>
/// CustomHandler 的摘要说明
/// </summary>
public class ImageHandler : IHttpHandler
{
public bool IsReusable
{
get { return false; }
}
public void ProcessRequest(HttpContext context)
{
if (!string.IsNullOrEmpty(context.Request.QueryString["picture"]))
{
string fileName = context.Request.QueryString["picture"];
OnServing(fileName);
try
{
string folder = "App_Data/Picture/";//图片路径请自己定义
FileInfo fi = new FileInfo(context.Server.MapPath(folder) + fileName);
if (fi.Exists &&fi.Directory.FullName.ToUpperInvariant().Contains (Path.DirectorySeparatorChar + "PICTURE"))
{
//context.Response.Cache.SetCacheability(HttpCacheability.Public);
//context.Response.Cache.SetExpires(DateTime.Now.AddYears(1));
//if (Utils.SetConditionalGetHeaders(fi.CreationTimeUtc))
// return;
int index = fileName.LastIndexOf(".") + 1;
string extension = fileName.Substring(index).ToUpperInvariant();
// Fix for IE not handling jpg image types
if (string.Compare(extension, "JPG") == 0)
context.Response.ContentType = "image/jpeg";
else
context.Response.ContentType = "image/" + extension;
context.Response.TransmitFile(fi.FullName);
OnServed(fileName);
}
else
{
OnBadRequest(fileName);
context.Response.ContentType = "image/gif";
context.Response.TransmitFile(context.Server.MapPath(folder) + "nophoto.gif");
//context.Response.Redirect(Utils.AbsoluteWebRoot + "error404.aspx");
}
}
catch (Exception ex)
{
OnBadRequest(ex.Message);
//context.Response.Redirect(Utils.AbsoluteWebRoot + "error404.aspx");
}
}
}
/**/
/// <summary>
/// Occurs before the requested image is served.
/// </summary>
public static event EventHandler<EventArgs> Serving;
private static void OnServing(string file)
{
if (Serving != null)
{
Serving(file, EventArgs.Empty);
}
}
/**/
/// <summary>
/// Occurs when a file is served.
/// </summary>
public static event EventHandler<EventArgs> Served;
private static void OnServed(string file)
{
if (Served != null)
{
Served(file, EventArgs.Empty);
}
}
/**/
/// <summary>
/// Occurs when the requested file does not exist.
/// </summary>
public static event EventHandler<EventArgs> BadRequest;
private static void OnBadRequest(string file)
{
if (BadRequest != null)
{
BadRequest(file, EventArgs.Empty);
}
}
}
}
<configuration>
<appSettings/>
<connectionStrings/>
<system.web>
<httpHandlers>
<add verb="*" path="image.axd" type="CustomHandler.ImageHandler" validate="true"/>
</httpHandlers>
</system.web>
</configuration>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_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>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<img src="/image.axd?picture=IP.jpg" /></div>
</form>
</body>
</html>
