.Net网站防盗链

一、简单写法，在Global.asax下的这个方法中添加如下信息

         /// <summary>
         /// 管道当中的第一个事件
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         protected void Application_BeginRequest(object sender, EventArgs e)
         {
             //防盗链
             if (Request.RawUrl.Contains("images/"))
             {
                 if (Request.UrlReferrer==null || !IsSameDomain(Request.UrlReferrer,Request.Url))
                 {
                     Response.ContentType = "image/jpeg";
                     string path = Request.MapPath("/daplian.jpg");
                     Response.WriteFile(path);
                     Response.End();
                 }
             }
         }
         /// <summary>
         /// 判断域名是否相同
         /// </summary>
         /// <param name="u1"></param>
         /// <param name="u2"></param>
         /// <returns></returns>
         bool IsSameDomain(Uri u1,Uri u2)
         {
             return Uri.Compare(u1, u2, UriComponents.HostAndPort, UriFormat.SafeUnescaped, StringComparison.CurrentCulture) ==  ? true : false;
         }