获取当前SILVERLIGHT程序存放网络URL的前缀

/// <summary>
        /// 获取当前SILVERLIGHT程序存放网络URL的前缀
        /// </summary>
        /// <returns>URL前缀</returns>
        public static string GetUrl()
        {
            ScriptObject location = (HtmlPage.Window.GetProperty("location")) as ScriptObject;//获取当前脚本对象
            object r = location.GetProperty("href");
            string URL = r.ToString().Substring(0, r.ToString().LastIndexOf('/'));//截取到当前SILVERLIGHT程序存放网络URL的前缀
            return URL;
        }