获取站点RootURI

    public class UitlHelper
    {
        public static string GetRootURI()
        {
            string AppPath = "";
            HttpContext HttpCurrent = HttpContext.Current;
            HttpRequest Req;
            if (HttpCurrent != null)
            {
                Req = HttpCurrent.Request;

                string UrlAuthority = Req.Url.GetLeftPart(UriPartial.Authority);
                if (Req.ApplicationPath == null || Req.ApplicationPath == "/")
                    //直接安装在   Web   站点  
                    AppPath = UrlAuthority;
                else
                    //安装在虚拟子目录下  
                    AppPath = UrlAuthority + Req.ApplicationPath;
            }
            return AppPath;
        }
    }