aspnet 怎么获取浏览器等客户端请求的url地址？

怎么获取客户端请求的url地址，请参阅下面的代码：

    /// <summary>    /// 获得当前请求网站的URL    /// </summary>    /// <returns></returns>    protected string GetHostUrl()    {        string AppUrl = "http://{0}{1}";        string host = this.Request.Url.Host;        if (!Request.Url.IsDefaultPort) host += ":" + Request.Url.Port;             return string.Format(AppUrl, host, Request.Url.AbsolutePath.ToString());    }

主要用到的类：Url