C#写一个TCP通信得程序

以下是一个简单的 C# TCP 通信的程序，其中包含了客户端和服务器端的代码。

服务器端代码：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace TCPServer
{
    class Program
    {
        static void Main(string[] args)
        {
            IPAddress ipAddress = IPAddress.Parse("127.0.0.1");
            int port = 8888;

            TcpListener serverSocket = new TcpListener(ipAddress, port);
            TcpClient clientSocket = default(TcpClient);

            serverSocket.Start();
            Console.WriteLine(" >> Server Started");

            while (true)
            {
                clientSocket = serverSocket.AcceptTcpClient();
                Console.WriteLine(" >> Accept connection from client");

                NetworkStream networkStream = clientSocket.GetStream();
                byte[] bytesFrom = new byte[10025];
                networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                string dataFromClient = Encoding.ASCII.GetString(bytesFrom);
                dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));

                Console.WriteLine(" >> Data from client - " + dataFromClient);

                string serverResponse = "Last Message from client - " + dataFromClient;
                Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);
                networkStream.Write(sendBytes, 0, sendBytes.Length);
                networkStream.Flush();

                Console.WriteLine(" >> " + serverResponse);
            }

            clientSocket.Close();
            serverSocket.Stop();
            Console.WriteLine(" >> exit");
            Console.ReadLine();
        }
    }
}

客户端代码：

using System;
using System.Net.Sockets;
using System.Text;

namespace TCPClient
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                TcpClient clientSocket = new TcpClient();
                clientSocket.Connect("127.0.0.1", 8888);
                Console.WriteLine(" >> Client Started");

                string message = "Hello Server!";
                Byte[] sendBytes = Encoding.ASCII.GetBytes(message);
                NetworkStream networkStream = clientSocket.GetStream();
                networkStream.Write(sendBytes, 0, sendBytes.Length);
                networkStream.Flush();

                byte[] bytesFrom = new byte[10025];
                networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                string dataFromServer = Encoding.ASCII.GetString(bytesFrom);
                dataFromServer = dataFromServer.Substring(0, dataFromServer.IndexOf("$"));

                Console.WriteLine(" >> Data from server - " + dataFromServer);

                networkStream.Flush();
                clientSocket.Close();

                Console.WriteLine(" >> exit");
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine(" >> " + ex.ToString());
            }
        }
    }
}

在运行这个程序之前，需要先运行服务器端程序，然后再运行客户端程序。在成功运行之后，客户端将会发送消息“Hello Server!”给服务器端，然后服务器端会将消息原样发送回客户端。