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

以下是一个简单的C#带样式Socket点对点通信的例子，该例子包含连接按钮、断开按钮、发送按钮和两个RichTextBox控件（分别用于显示接收和发送的消息）：

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

namespace SocketCommunication
{
    public partial class Form1 : Form
    {
        private Socket clientSocket;
        private Thread receiveThread;
        private bool isRunning = true;

        public Form1()
        {
            InitializeComponent();
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            if (clientSocket != null && clientSocket.Connected)
            {
                MessageBox.Show("Already connected.");
                return;
            }

            try
            {
                IPAddress ip = IPAddress.Parse(txtIP.Text);
                int port = int.Parse(txtPort.Text);
                IPEndPoint endPoint = new IPEndPoint(ip, port);

                clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                clientSocket.Connect(endPoint);

                receiveThread = new Thread(new ThreadStart(ReceiveData));
                receiveThread.Start();

                MessageBox.Show("Connected successfully.");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Failed to connect: " + ex.Message);
            }
        }

        private void btnDisconnect_Click(object sender, EventArgs e)
        {
            if (clientSocket == null || !clientSocket.Connected)
            {
                MessageBox.Show("Not connected yet.");
                return;
            }

            isRunning = false;
            receiveThread.Join();

            clientSocket.Shutdown(SocketShutdown.Both);
            clientSocket.Close();
            clientSocket = null;

            MessageBox.Show("Disconnected successfully.");
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            if (clientSocket == null || !clientSocket.Connected)
            {
                MessageBox.Show("Not connected yet.");
                return;
            }

            string message = txtMessage.Text;
            byte[] data = Encoding.UTF8.GetBytes(message);

            try
            {
                clientSocket.Send(data);
                AppendText(txtSent, message, true);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Failed to send message: " + ex.Message);
            }
        }

        private void ReceiveData()
        {
            while (isRunning)
            {
                try
                {
                    byte[] buffer = new byte[1024];
                    int count = clientSocket.Receive(buffer);
                    if (count > 0)
                    {
                        string message = Encoding.UTF8.GetString(buffer, 0, count);
                        AppendText(txtReceived, message, false);
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Failed to receive data: " + ex.Message);
                    isRunning = false;
                }
            }
        }

        private void AppendText(RichTextBox richTextBox, string text, bool isSent)
        {
            if (richTextBox.InvokeRequired)
            {
                richTextBox.Invoke(new Action<RichTextBox, string, bool>(AppendText), richTextBox, text, isSent);
            }
            else
            {
                richTextBox.SelectionStart = richTextBox.TextLength;
                richTextBox.SelectionLength = 0;
                richTextBox.SelectionColor = isSent ? System.Drawing.Color.Blue : System.Drawing.Color.Red;
                richTextBox.AppendText(text + Environment.NewLine);
                richTextBox.SelectionColor = richTextBox.ForeColor;
            }
        }
    }
}

在界面设计器中，将以下控件添加到窗体上并设置其属性：

- 两个RichTextBox控件，分别命名为txtReceived和txtSent，用于显示接收和发送的消息。
- 三个Button控件，分别命名为btnConnect、btnDisconnect和btnSend，用于连接、断开和发送消息。
- 两个TextBox控件，分别命名为txtIP和txtPort，用于指定连接的IP地址和端口号。

然后，将btnConnect、btnDisconnect和btnSend的Click事件分别绑定到btnConnect_Click、btnDisconnect_Click和btnSend_Click方法，如下所示：

private void btnConnect_Click(object sender, EventArgs e)
{
    // ...
}

private void btnDisconnect_Click(object sender, EventArgs e)
{
    // ...
}

private void btnSend_Click(object sender, EventArgs e)
{
    // ...
}

最后，实现ReceiveData和AppendText方法，用于接收数据并在RichTextBox控件中显示数据，如下所示：

private void ReceiveData()
{
    while (isRunning)
    {
        try
        {
            byte[] buffer = new byte[1024];
            int count = clientSocket.Receive(buffer);
            if (count > 0)
            {
                string message = Encoding.UTF8.GetString(buffer, 0, count);
                AppendText(txtReceived, message, false);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Failed to receive data: " + ex.Message);
            isRunning = false;
        }
    }
}

private void AppendText(RichTextBox richTextBox, string text, bool isSent)
{
    if (richTextBox.InvokeRequired)
    {
        richTextBox.Invoke(new Action<RichTextBox, string, bool>(AppendText), richTextBox, text, isSent);
    }
    else
    {
        richTextBox.SelectionStart = richTextBox.TextLength;
        richTextBox.SelectionLength = 0;
        richTextBox.SelectionColor = isSent ? System.Drawing.Color.Blue : System.Drawing.Color.Red;
        richTextBox.AppendText(text + Environment.NewLine);
        richTextBox.SelectionColor = richTextBox.ForeColor;
    }
}

这样，一个简单的C#带样式Socket点对点通信就完成了。