/// <summary>
    /// 获取当前站点域名
    /// </summary>
    /// <returns></returns>
    public string GetSiteUrl()
    {
        string fullUrl = Request.Url.AbsoluteUri;
        string querystring = Request.Url.PathAndQuery;
        string url = fullUrl.Replace(querystring, "") + "/";
        return url;
    }