这样可以防止盗链吗？

Question

参考了论坛里几位大师的意见，在项目中添加了ashx文件,代码如下：
 [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Handler1 : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            string Filepath = context.Server.MapPath(context.Request.FilePath);

            if (context.Request.UrlReferrer.Host.Contains("cmltl.cn"))
            {
                context.Response.ContentType = context.Request.ContentType;
                context.Response.WriteFile(Filepath);
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }