AvoidImage类库设计-优快云博客

新建一个类库AvoidImage 继承IHttpHandler，记得引用System.Web

class AvoidImage : IHttpHandler
    {

        #region IHttpHandler 成员

        public bool IsReusable
        {
            //get { throw new NotImplementedException(); }
            get {
                return true;
            }
        }

        #endregion
        public void ProcessRequest(HttpContext context)
        {
            Uri urlreferrer = context.Request.UrlReferrer;//访问来源地址
            string ip = context.Request.UserHostAddress;//访问来源Ip地址
            string serverhost = context.Request.Url.Host;//当前访问主机地址
            string localIp = ConfigurationManager.AppSettings["LocalIP"];
            if (urlreferrer == null || urlreferrer.Host.ToLower() != serverhost.ToLower() || ip != localIp)
            {
                context.Response.WriteFile("~/images/index_adr11.gif");
            }
            else
            {
                context.Response.WriteFile(context.Request.PhysicalPath);
            }
        }
    }

default.aspx

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