.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) == 0 ? true : false;
        }