1、TCP实现类

internal class TcpServer
    {
        public Socket ServerSocket { get; set; }
        public Dictionary<string,Socket> Sockets { get; set; }= new Dictionary<string,Socket>();
        public byte[] SendBuffer { get; set; }
        public byte[] ReceiveBuffer { get; set; }
        /// <summary>
        /// 创建构造函数
        /// </summary>
        /// <param name="sendBufferLength"></param>
        /// <param name="receiveBufferLength"></param>
        public TcpServer(int sendBufferLength, int receiveBufferLength)
        {
            SendBuffer = new byte[sendBufferLength];
            ReceiveBuffer = new byte[receiveBufferLength];
        }
        /// <summary>
        /// 启动服务器
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="port"></param>
        public void Start(string ip, string port)
        {
            ServerSocket = CreateSocket(ip, port);
            CreateThread();
        }
        /// <summary>
        /// 服务端向指定客户端发送消息
        /// </summary>
        /// <param name="clientInfo"></param>
        /// <param name="data"></param>
        public void Send(string clientInfo, byte[] data)
        {
            Socket socket = Sockets[clientInfo];
            socket.Send(data);
        }
        /// <summary>
        /// 创建服务端Socket
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="port"></param>
        /// <returns></returns>
        private Socket CreateSocket(string ip, string port)
        {
            Socket socket=new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress address=IPAddress.Parse(ip);
            IPEndPoint endPoint=new IPEndPoint(address, int.Parse(port));
            socket.Bind(endPoint);
            socket.Listen(20);
            return socket;
        }
        /// <summary>
        /// 创建监听客户端的线程并启动
        /// </summary>
        private void CreateThread()
        {
            Thread watchThread = new Thread(WatchConnection);
            watchThread.IsBackground = true;
            watchThread.Start();
        }
        /// <summary>
        /// 监听客户端请求
        /// </summary>
        private void WatchConnection()
        {
            while (true)
            {
                Socket clientSocket = null;
                try
                {
                    clientSocket = ServerSocket.Accept();
                    IPEndPoint endPoint = (IPEndPoint)clientSocket.RemoteEndPoint;
                    string ip= endPoint.Address.ToString();
                    string port= endPoint.Port.ToString();
                    Sockets.Add(ip + ":" + port, clientSocket);

                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                    break;
                }
                ParameterizedThreadStart pts = new ParameterizedThreadStart(ClientReceiver);
                Thread clientThread = new Thread(pts);
                clientThread.IsBackground = true;
                clientThread.Start(clientSocket);
            }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="socket"></param>
        private void ClientReceiver(object socket)
        {
            Socket clientSocket=socket as Socket;
            int ReceiveBufferSize = 1 * 1024;
            while (true)
            {
                int receivedLength = 0;
                byte[] buffer = new byte[ReceiveBufferSize];
                try
                {
                    List<byte> ls = new List<byte>();
                    if (clientSocket != null)
                    {
                        receivedLength = clientSocket.Receive(buffer);
                        if (receivedLength > 0)
                        {
                            Buffer.BlockCopy(buffer,0, ReceiveBuffer, 0, receivedLength);
                            string msg = "Receive Success " + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
                            byte[] datas = System.Text.Encoding.UTF8.GetBytes(msg);
                            clientSocket.Send(datas);
                        }
                    }
                }catch(Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                    break;
                }
            }
        }
    }

2、页面布局

<Grid Margin="10">
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="50"/>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="50"/>
            <RowDefinition Height="50"/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0" Text="配置" VerticalAlignment="Center"/>
        <DockPanel Grid.Row="1">
            <DockPanel HorizontalAlignment="Left">
                <TextBlock Text="地址" VerticalAlignment="Center" Margin="20 0 10 0"/>
                <TextBox x:Name="TextBoxIp" Text="" Width="100" Height="36" VerticalContentAlignment="Center"/>
                <TextBlock Text="端口" VerticalAlignment="Center" Margin="20 0 10 0"/>
                <TextBox x:Name="TextBoxport" Text="" Width="100" Height="36" VerticalContentAlignment="Center"/>
                <Button x:Name="ButtonStart" Content="启动" Width="75" Height="36" Margin="20,0,10,0" Click="ButtonStart_Click"/>
            </DockPanel>
            <DockPanel HorizontalAlignment="Right">
                <TextBlock Text="客户端" VerticalAlignment="Center" Margin="20 0 10 0"/>
                <ComboBox x:Name="ComboBoxClient" SelectedValuePath="Key" DisplayMemberPath="Key" Width="200" Height="36" Margin="20 0 10 0" SelectionChanged="ComboBoxClient_SelectionChanged"/>
            </DockPanel>
        </DockPanel>
        <TextBlock Grid.Row="2" Text="接收" VerticalAlignment="Center"/>
        <TextBox Grid.Row="3" Name="TextBoxReciver" Text=""/>
        <TextBlock Grid.Row="4" Text="发送" VerticalAlignment="Center"/>
        <StackPanel Grid.Row="5" Orientation="Horizontal">
            <TextBox x:Name="TextBoxSender" Text="" Width="650" Height="36"/>
            <Button Content="发送" Click="ButtonSend_CLick" Width="75" Height="36" HorizontalAlignment="Right" Margin="10 0 20 0"/>
        </StackPanel>
    </Grid>

3、后台代码

TcpServer tcpServer= null;
        public MainWindow()
        {
            InitializeComponent();
            tcpServer = new TcpServer(2 * 1024, 2 * 1024);
            TextBoxIp.Text = "10.11.10.44";
            TextBoxport.Text = "8080";
        }

        private void ButtonStart_Click(object sender, RoutedEventArgs e)
        {
            string address = this.TextBoxIp.Text;
            string[] arr= address.Split('.');
            if (arr.Length == 4)
            {
                foreach(string item in arr)
                {
                    int i=int.Parse(item);
                    if(i < 0 || i > 255)
                    {
                        return;
                    }
                }
            }
            string port = this.TextBoxport.Text;
            int j= int.Parse(port);
            if (j < 0)
            {
                return;
            }
            ComboBoxClient.ItemsSource = tcpServer.Sockets;
            tcpServer.Start(address, port);
        }
        string currentClient = null;
        private void ComboBoxClient_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //currentClient = ComboBoxClient.SelectedValue.ToString();
            ComboBox comboBox = sender as ComboBox;
            string str = comboBox.SelectedValue.ToString();
            if (tcpServer.Sockets.ContainsKey(str))
            {
                currentClient = str;
            }
        }

        private void ButtonSend_CLick(object sender, RoutedEventArgs e)
        {
            if (currentClient != null)
            {
                string str = TextBoxSender.Text;
                byte[] bytes=System.Text.Encoding.UTF8.GetBytes(str);
                tcpServer.Send(currentClient,bytes);
            }
        }

4、运行结果