asp.net防图片盗链HttpHandler

IHttpHandler 成员 #region IHttpHandler 成员

    bool IHttpHandler.IsReusable
    {
        get { return true; }
    }

    void IHttpHandler.ProcessRequest(HttpContext context)
    {
        string FileName = context.Server.MapPath(context.Request.FilePath);
        if (context.Request.UrlReferrer.Host == null)
        {
            context.Response.ContentType = "image/JPEG";
            context.Response.WriteFile("/no.jpg");
        }
        else
        {
            if (context.Request.UrlReferrer.Host.IndexOf("mydomain.com") > 0)
            {
                context.Response.ContentType = "image/JPEG";
                context.Response.WriteFile(FileName);
            }
            else
            {
                context.Response.ContentType = "image/JPEG";
                context.Response.WriteFile("no/jpg");
            }
        }
    }

    #endregion

< httpHandlers >
< add verb = " * "  path = " *.jpg "  type = " JpgHandler, MyDll "   />
</ httpHandlers >