侦听特定的端口C＃

Question

I want to listen specific port in c#, but I don't want to write a chat program in net. I just want listen to a port and receive all of the bytes that come from that port. I asked this question before but I did't get a useful answer. I say again, I don't want to have a client and server program, I want to just have a single program that run on my Computer and show me what bytes are received from specific port, or a program that show me what IP is connected to each port , like "netstat" command in CMD.(I don't want to use CMD command in my C# program) please help me.

Answer 1

I think this should get you started. This will show you similar information to netstat :

using System;
using System.Net;
using System.Net.NetworkInformation;

static void Main()
{

    IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
    TcpConnectionInformation[] tcpConnections = ipGlobalProperties.GetActiveTcpConnections();

    foreach (TcpConnectionInformation tcpConnection in tcpConnections)
    {
        Console.WriteLine("Local Address {0}:{1}\nForeign Address {2}:{3}\nState {4}",
                        tcpConnection.LocalEndPoint.Address,
                        tcpConnection.LocalEndPoint.Port,
                        tcpConnection.RemoteEndPoint.Address,
                        tcpConnection.RemoteEndPoint.Port,
                        tcpConnection.State);
    }
}

To listen to a port, the sample code provided by Microsoft here should get you going.

Answer 2

You need a sniffer. Check Wireshark out.