每天积累一点点，

一、获取获取根目录的URL的方法

#region 获取本页根目录URL
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;
}
#endregion

二、获取全URL

IN_URL = Request.Url.ToString();

希望积少成多，水滴石穿！