C#取得域名以及目录地址的方法

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace SinvanCMS.Common
{
    /// <summary>
    /// 全局类，当前域名，物理路径
    /// </summary>
    public class Application
    {
        /// <summary>
        /// 获得url路径, http://localhost/www_dalian/fangyuan.asp 的app部分如：http://localhost/www_dalian
        /// </summary>
        public static string AppUrl
        {
            get
            {
                return "http://" + System.Web.HttpContext.Current.Request.Url.Host.ToString() + AppSiteName;
            }
        }
        /// <summary>
        /// 获得 http://localhost/www_dalian/fangyuan.asp 的 部分如：www_dalian
        /// </summary>
        public static string AppSiteName
        {
            get
            {
                string SiteAddress = "";
                SiteAddress = System.Web.HttpContext.Current.Request.ApplicationPath.ToString();