写一个C# 带样式Socket点对点通信，要求界面上有连接按钮，断开按钮，发送按钮，两个RichTextBox控件，端口号要固定

以下是一个简单的 C# 带样式 Socket 点对点通信程序，界面上包含连接按钮、断开按钮、发送按钮和两个 RichTextBox 控件，并且端口号固定为 8888：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace SocketDemo
{
    public partial class Form1 : Form
    {
        private Socket clientSocket;
        private Thread receiveThread;

        public Form1()
        {
            InitializeComponent();
        }

        private void ConnectButton_Click(object sender, EventArgs e)
        {
            try
            {
                // 创建客户端 Socket
                clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

                // 连接服务器
                clientSocket.Connect(IPAddress.Parse("127.0.0.1"), 8888);

                // 启动接收线程
                receiveThread = new Thread(ReceiveMessage);
                receiveThread.Start();

                // 更新界面状态
                ConnectButton.Enabled = false;
                DisconnectButton.Enabled = true;
                SendMessageButton.Enabled = true;
                MessageBox.Show("连接成功！");
            }
            catch (Exception ex)
            {
                MessageBox.Show("连接失败：" + ex.Message);
            }
        }

        private void DisconnectButton_Click(object sender, EventArgs e)
        {
            try
            {
                // 关闭连接
                clientSocket.Shutdown(SocketShutdown.Both);
                clientSocket.Close();

                // 停止接收线程
                receiveThread.Abort();

                // 更新界面状态
                ConnectButton.Enabled = true;
                DisconnectButton.Enabled = false;
                SendMessageButton.Enabled = false;
                MessageBox.Show("已断开连接！");
            }
            catch (Exception ex)
            {
                MessageBox.Show("断开连接失败：" + ex.Message);
            }
        }

        private void SendMessageButton_Click(object sender, EventArgs e)
        {
            try
            {
                // 发送消息
                byte[] buffer = Encoding.UTF8.GetBytes(MessageTextBox.Text);
                clientSocket.Send(buffer);

                // 清空输入框
                MessageTextBox.Clear();
            }
            catch (Exception ex)
            {
                MessageBox.Show("发送消息失败：" + ex.Message);
            }
        }

        private void ReceiveMessage()
        {
            try
            {
                while (true)
                {
                    // 接收消息
                    byte[] buffer = new byte[1024];
                    int bufferSize = clientSocket.Receive(buffer);
                    string message = Encoding.UTF8.GetString(buffer, 0, bufferSize);

                    // 显示消息
                    if (InvokeRequired)
                    {
                        Invoke(new Action(() =>
                        {
                            ReceiveRichTextBox.AppendText(message);
                            ReceiveRichTextBox.ScrollToCaret();
                        }));
                    }
                    else
                    {
                        ReceiveRichTextBox.AppendText(message);
                        ReceiveRichTextBox.ScrollToCaret();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("接收消息失败：" + ex.Message);
            }
        }
    }
}

其中，ConnectButton_Click 方法用于连接服务器，DisconnectButton_Click 方法用于断开连接，SendMessageButton_Click 方法用于发送消息，ReceiveMessage 方法用于接收消息并显示在接收 RichTextBox 控件中。启动接收线程时需要使用 Invoke 方法来更新界面状态，否则会出现“跨线程访问控件异常”的错误。