c#得到本机IP的函数

收集客户机信息时，需要得到客户机的IP，那么客户端就需要提供自己的本机IP：

using System;
using System.Net;
using System.Windows.Forms;

namespace Mynet
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(GetMyIP());
        }
        
        /// <summary>
        /// 得到本机IP
        /// </summary>
        /// <returns></returns>
        public string GetMyIP()
        {
            try
            {
                string computername = Dns.GetHostName();
                IPHostEntry ipall = Dns.GetHostEntry(computername);
                for (int i = 0; i < ipall.AddressList.Length; i++)
                {
                    string theip = ipall.AddressList[i].ToString();
                    if (theip.LastIndexOf(".") != -1)
                    {
                        return theip;
                    }
                }
                return "未得到IP地址";
            }
            catch (Exception ErrMsg)
            {
                return ErrMsg.ToString();
            }
        }
    }
}