C#网络TCP客户端的实现

1、创建Form窗口
在窗口添加TextBox用于设置IP、Port、以及显示数据，并添加连接Button；
2、实现过程

  //创建Socket
    private Socket tcpClient;
    //创建取消数据源
    private CancellationTokenSource cts = new CancellationTokenSource();

    private void bt_netConnect_Click(object sender, EventArgs e)
    {
        if (this.bt_netConnect.Text == "连接")
        {
            //实例化Socket
            tcpClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            EndPoint ep = new IPEndPoint(IPAddress.Parse(this.tb_ipTxt.Text), int.Parse(this.tb_portTxt.Text));
            try
            {
                tcpClient.Connect(ep);
            }
            catch (Exception ex)
            {
                MessageBox.Show("连接失败："   ex.Message);
                return;
            }
            MessageBox.Show("连接成功");
            this.bt_netConnect.Text = "断开";
            Task.Run(new Action(() =>
            {
                GetValue();
            }));
        }
        else
        {
            tcpClient?.Close();
            this.bt_netConnect.Text = "连接";
        }
       
    }
    //读数据
    private void GetValue()
    {
        while (!cts.IsCancellationRequested)
        {
            byte[] buffer = new byte[1024 * 10];
            int length = -1;
            try
            {
                length = tcpClient.Receive(buffer, SocketFlags.None);
            }
            catch(Exception ex)
            {
                break;
            }
            if (length > 0)
            {
                byte[] result = new byte[length];
                Buffer.BlockCopy(buffer, 0, result, 0, length);
                ReceiveDataDisplay(result);
                SetValue(result); 
            }
        }
    }
    //显示接收数据
    private void ReceiveDataDisplay(byte[] b)
    {
        string str = System.Text.Encoding.Default.GetString(b);
        if (tb_receiveTxt.InvokeRequired)
        {
            MethodInvoker mi = delegate ()
            {
                string str1 = tb_receiveTxt.Text;
                tb_receiveTxt.Text = str1   str;
            };
            tb_receiveTxt.Invoke(mi);
        }
        else
        {
            string str1 = tb_receiveTxt.Text;
            tb_receiveTxt.Text = str1   str;
        }
    }
    //写数据
    private void SetValue(byte[] b)
    {
        if (tcpClient.Connected)
        {
            try
            {
                tcpClient.Send(b);
            }catch(Exception ex)
            {
                return;
            }
        }
    }

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