获取本机IP_考虑多网卡的情况

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Text.RegularExpressions;

namespace _09获取本机IP_考虑多网卡_
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(GetLocalIP());

Console.ReadKey();
}

/// <summary>
/// 获取当前使用的IP
/// </summary>
/// <returns></returns>
public static string GetLocalIP()
{
string result = RunApp("route", "print", true);
Match m = Regex.Match(result, @"0.0.0.0\s+0.0.0.0\s+(\d+.\d+.\d+.\d+)\s+(\d+.\d+.\d+.\d+)");
if (m.Success)
{
return m.Groups[2].Value;
}
else
{
try
{
System.Net.Sockets.TcpClient c = new System.Net.Sockets.TcpClient();
c.Connect("www.baidu.com", 80);
string ip = ((System.Net.IPEndPoint)c.Client.LocalEndPoint).Address.ToString();
c.Close();
return ip;
}
catch (Exception)
{
return null;
}
}
}

/// <summary>
/// 运行一个控制台程序并返回其输出参数。
/// </summary>
/// <param name="filename">程序名</param>
/// <param name="arguments">输入参数</param>
/// <returns></returns>
public static string RunApp(string filename, string arguments, bool recordLog)
{
try
{
if (recordLog)
{
Trace.WriteLine(filename + " " + arguments);
}
Process proc = new Process();
proc.StartInfo.FileName = filename;
proc.StartInfo.CreateNoWindow = true;
proc.StartInfo.Arguments = arguments;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.UseShellExecute = false;
proc.Start();

using (System.IO.StreamReader sr = new System.IO.StreamReader(proc.StandardOutput.BaseStream, Encoding.Default))
{
string txt = sr.ReadToEnd();
sr.Close();
if (recordLog)
{
Trace.WriteLine(txt);
}
if (!proc.HasExited)
{
proc.Kill();
}
return txt;
}
}
catch (Exception ex)
{
Trace.WriteLine(ex);
return ex.Message;
}
}
}
}