C#如何检测网络端口连接的状态

C#如何检测/监控远程连接网络端口的情况（例如：3389端口是否处于监听状态，是否建立了连接等）。

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Net.NetworkInformation;

namespace test 
{ 
    class Program 
    {

        static void Main(string[] args) 
        { 
            GetTcpConnections(); 
        }

 

        public static void GetTcpConnections() 
        { 
            IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties(); 
       
            TcpConnectionInformation[] connections = properties.GetActiveTcpConnections(); 
            foreach (TcpConnectionInformation t in connections) 
            { 
                Console.Write("Local endpoint: {0} ", t.LocalEndPoint.ToString()); 
                Console.Write("Remote endpoint: {0} ", t.RemoteEndPoint.ToString()); 
                Console.WriteLine("{0}", t.State); 
            } 
            Console.WriteLine(); 
            Console.ReadLine(); 
        }

    } 
}

 

运行结果：

Local endpoint: 127.0.0.1:1025 Remote endpoint: 127.0.0.1:1026 Established 
Local endpoint: 127.0.0.1:1026 Remote endpoint: 127.0.0.1:1025 Established 
Local endpoint: 127.0.0.1:1028 Remote endpoint: 127.0.0.1:16992 CloseWait 
Local endpoint: 127.0.0.1:1110 Remote endpoint: 127.0.0.1:4900 Established 
Local endpoint: 127.0.0.1:2754 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:2762 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:2773 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:2913 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:3014 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:3531 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:4012 Remote endpoint: 127.0.0.1:1110 CloseWait 
Local endpoint: 127.0.0.1:4900 Remote endpoint: 127.0.0.1:1110 Established