C#图片防盗链

1 写一个继承自IHttpHandler的类,并生成DLL;

using System;

using System.Web;

using System.Collections.Generic;

using System.Text;

namespace ImgProtect

{

public class ImgProtectHadler:IHttpHandler

{

public bool IsReusable

{

get

{

return true;

}

}

public void ProcessRequest(HttpContext context)

{

string path = context.Request.PhysicalPath;

string serverHost = context.Request.Url.Host;

Uri u = context.Request.UrlReferrer;

if (u == null || u.Host.ToLower() != serverHost.ToLower())

{

context.Response.WriteFile("~/Forbidden.gif");

}

else

{

context.Response.WriteFile(path);

}

}

}

}

2 在网站中引用　该DLL;

3 在Web.config中加入

<httpHandlers>

<add verb="*" path="*.jpg,*.jpeg,*.gif,*.png,*.bmp" type="ImgProtect.ImgProtectHadler"/>

</httpHandlers>