C#获取本地IP

通过创建 UDP 套接字连接到外部地址，可以获取当前网络接口的本地 IP：

using System;
using System.Net;
using System.Net.Sockets;
class Program
{
    static void Main()
    {
        using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0))
        {
            socket.Connect("8.8.8.8", 65530);
            IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint;
            Console.WriteLine("本地 IP: " + endPoint.Address.ToString());
        }
    }
}