[C#] 查詢本機IP GetIP

寫程式常常會遇到需要用到本機IP的事
但是又不知道本機IP是多少該怎麼辦呢?

獲取本機所有IP位址:

private void GetIP()  
{  
    string hostName = Dns.GetHostName();  //取得本機名稱
    //取得所有IP，包含IPV4和IPV6
    System.Net.IPAddress[] addressList = Dns.GetHostAddresses(hostName);  
    foreach (IPAddress ip in addressList)  
    {  
        Console.WriteLine(ip.ToString());  
    }  
    Console.ReadLine();
}

以上的IP包含所有網卡(虛擬網卡)的IPV4和IPV6的IP

如果想要只取IPV4的位址，需加入以下條件，
獲取本機所有IPV4位址:

private void GetIP()  
{  
    string hostName = Dns.GetHostName();  //取得本機名稱
    //取得所有IP，包含IPV4和IPV6
    System.Net.IPAddress[] addressList = Dns.GetHostAddresses(hostName);  
    foreach (IPAddress ip in addressList)  
    {  
        //過濾IPV4的位址
        if (ip.AddressFamily == AddressFamily.InterNetwork)  
            Console.Writeline(ip.ToString());    
    }  
    Console.ReadLine();
}

以上包含所有網卡(虛擬網卡)的IPV4

若想過濾掉虛擬網卡位址的話，必需使用下列程式碼實現，
獲取本機IPV4，過濾虛擬網卡:

class Program
{
    static void Main(string[] args)
    {

        Console.WriteLine(GetLocalIP());
        Console.WriteLine("-- -- The End -- --");
        Console.ReadKey();
    }


    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
        {
            return "找不到本機IP";
        }
    }

    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;
        }
    }
}

以上就能過濾掉其他討厭的IP位址啦!