Global.asax 文件中        protected void Application_BeginRequest(object sender, EventArgs e)        {            //判断当前请求是否是访问 images/文件夹            if (Request.RawUrl.ToLower().Contains("/images/"))            {                Uri referrer = Request.UrlReferrer;                Uri url = Request.Url;                if (!CompareURL(url, referrer))                {                    //输出盗链图片                    string path = Request.MapPath("~/images/daolian.gif");                    Response.WriteFile(path);                    //结束请求                    Response.End();                }            }        }        bool CompareURL(Uri u1, Uri u2)        {            return Uri.Compare(u1, u2, UriComponents.HostAndPort, UriFormat.SafeUnescaped, StringComparison.CurrentCultureIgnoreCase) == 0;        } 转：http://blog.csdn.net/zhangquanok/article/details/10072293