获取服务器ip,本地ip,本在mac

using System.Net;
// 在此处放置用户代码以初始化页面
    string SessionID = HttpContext.Current.Request.UserHostAddress;

    string strHostName = Dns.GetHostName(); //得到本机的主机名
    IPHostEntry ipEntry = Dns.GetHostByName(strHostName); //取得本机IP 
    SessionID = SessionID +","+ ipEntry.AddressList[0].ToString();
    Label1.Text = SessionID;

   System.Diagnostics.Process p=new System.Diagnostics.Process();
   p.StartInfo.CreateNoWindow=true;
   p.StartInfo.UseShellExecute=false;
   p.StartInfo.RedirectStandardOutput=true;
   p.StartInfo.FileName="ipconfig";
   p.StartInfo.Arguments="/all";
   p.Start();
   p.WaitForExit();
   string s=p.StandardOutput.ReadToEnd();
   Label1.Text+=","+s.Substring(s.IndexOf("Physical Address. . . . . . . . . :")+36,17);

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//
            //获取指定域名的IP地址
            //
            string StringURL;
            StringURL = "http://www.baidu.com/";
            for (int i = 0; i < Dns.GetHostEntry(StringURL).AddressList.Length; i = i + 1)
            {
                MessageBox.Show(Dns.GetHostEntry(StringURL).AddressList[i].ToString());
            }

            //
            //获取本机IP地址
            //
            string StringHost;
            StringHost = Dns.GetHostName();
            for (int i = 0; i < Dns.GetHostEntry(StringHost).AddressList.Length; i = i + 1)
            {
                MessageBox.Show(Dns.GetHostEntry(StringHost).AddressList[i].ToString());
            }
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