<Window x:Class="Server.MainWindow"

         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

         xmlns:local="clr-namespace:Server"

         mc:Ignorable="d"

         xmlns:md="http://materialdesigninxaml.net/winfx/xaml/themes"

         WindowStartupLocation="CenterScreen" ResizeMode="NoResize"

         Loaded="MainWindow_OnLoaded"

         Title="Server" Height="450" Width="600">

     <Grid>

         <Grid.ColumnDefinitions>

             <ColumnDefinition Width="Auto"/>

             <ColumnDefinition Width="1*"/>

         </Grid.ColumnDefinitions>

         <TreeView x:Name="tvRemotes">

         </TreeView>

         <Grid Grid.Column="1">

             <Grid.RowDefinitions>

                 <RowDefinition Height="Auto"/>

                 <RowDefinition Height="Auto"/>

                 <RowDefinition Height="Auto"/>

                 <RowDefinition Height="1*"/>

             </Grid.RowDefinitions>

             <Grid.ColumnDefinitions>

                 <ColumnDefinition />

                 <ColumnDefinition Width="Auto"/>

             </Grid.ColumnDefinitions>

             <TextBlock HorizontalAlignment="Right" Margin="5,0,2,0" Padding="5" Text="本地地址"/>

             <TextBox x:Name="tbIP" IsReadOnly="True" Grid.Row="0" Grid.Column="1" Margin="5" Text="127.0.0.1" />

             <TextBlock HorizontalAlignment="Right" Margin="5,0,2,0" Padding="5" Grid.Row="1" Grid.Column="0" Text="本地端口:"/>

             <TextBox x:Name="tbPort" Grid.Row="1" Grid.Column="1" Margin="5"/>

             <StackPanel Grid.Row="2" Grid.Column="1" Orientation="Horizontal">

                 <Button x:Name="btnListen" Content="开始监听" Margin="15" Click="BtnListen_OnClick"/>

                 <Button x:Name="btnDisconnect" Content="断开连接" IsEnabled="False" Margin="15" Click="BtnDisconnect_OnClick"/>

             </StackPanel>

             <ListView x:Name="lvDebugs" Grid.Row="3" Grid.ColumnSpan="2" Grid.Column="0" AlternationCount="2">

                 <ListView.ItemContainerStyle>

                     <Style TargetType="ListViewItem">

                         <Style.Triggers>

                             <Trigger Property="ListView.AlternationIndex" Value="0">

                                 <Setter Property="Background" Value="White"/>

                             </Trigger>

                             <Trigger Property="ListView.AlternationIndex" Value="1">

                                 <Setter Property="Background" Value="WhiteSmoke"/>

                             </Trigger>

                         </Style.Triggers>

                     </Style>

                 </ListView.ItemContainerStyle>

             </ListView>

         </Grid>

     </Grid>

 </Window>

 using MaterialDesignThemes.Wpf;

 using System;

 using System.Collections.Generic;

 using System.Net;

 using System.Net.Sockets;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows;

 using System.Windows.Controls;

 using System.Windows.Threading;

 namespace Server

 {

     /// <summary>

     /// MainWindow.xaml 的交互逻辑

     /// </summary>

     public partial class MainWindow : Window

     {

         private TcpListener listener = null;

         private List<Socket> socketList = new List<Socket>();

         public class StateObject

         {

             public Socket workSocket = null;

             public const int BUFFER_SIZE = ;

             public byte[] buffer = new byte[BUFFER_SIZE];

         }

         public MainWindow()

         {

             InitializeComponent();

         }

         private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)

         {

         }

         /// <summary>

         /// 开启监听

         /// </summary>

         /// <param name="sender"></param>

         /// <param name="e"></param>

         private void BtnListen_OnClick(object sender, RoutedEventArgs e)

         {

             try

             {

                 listener = new TcpListener(new IPEndPoint(IPAddress.Any, Convert.ToInt32(tbPort.Text)));

                 listener.Start();

                 listener.BeginAcceptSocket(new AsyncCallback(AcceptCallback), listener.Server);

                 btnListen.IsEnabled = false;

                 btnDisconnect.IsEnabled = true;

             }

             catch (Exception ex)

             {

                 Add2ListView("启动监听异常: " + ex.Message);

             }

         }

         private void AcceptCallback(IAsyncResult ar)

         {

             Socket server = (Socket) ar.AsyncState;

             try

             {

                 Socket socket = server.EndAccept(ar);

                 string strAddr = socket.RemoteEndPoint.ToString();

                 socketList.Add(socket);

                 Dispatcher.Invoke(() =>

                 {

                     Add2TreeView(strAddr);

                     Add2ListView(strAddr);

                 }, DispatcherPriority.Normal);

                 var bytes = Encoding.UTF8.GetBytes("welcome.");

                 socket.Send(bytes);

                 StateObject so = new StateObject();

                 so.workSocket = socket;

                 socket.BeginReceive(so.buffer, , StateObject.BUFFER_SIZE, SocketFlags.None,

                     new AsyncCallback(ReceiveCallback), so);

                 server.BeginAccept(new AsyncCallback(AcceptCallback), server);

             }

             catch (Exception)

             {

                 // ignored

             }

         }

         /// <summary>

         /// 断开监听

         /// </summary>

         /// <param name="sender"></param>

         /// <param name="e"></param>

         private async void BtnDisconnect_OnClick(object sender, RoutedEventArgs e)

         {

             try

             {

                 foreach (var socket in socketList)

                 {

                     if (socket != null && socket.Connected)

                     {

                         socket.Shutdown(SocketShutdown.Both);

                         await Task.Delay();

                         socket.Close();

                     }

                 }

                 socketList.Clear();

                 listener.Stop();

                 // 清空客户端列表

                 tvRemotes.Items.Clear();

                 btnListen.IsEnabled = true;

                 btnDisconnect.IsEnabled = false;

             }

             catch (Exception ex)

             {

                 Add2ListView("断开监听异常: " + ex.Message);

             }

         }

         private void ReceiveCallback(IAsyncResult ar)

         {

             StateObject so = ar.AsyncState as StateObject;

             Socket socket = so.workSocket;

             if (socket != null && socket.Connected)

             {

                 int read = socket.EndReceive(ar);

                 ar.AsyncWaitHandle.Close();

                 if (read > )

                 {

                     Dispatcher.Invoke(() => Add2ListView(text: socket.RemoteEndPoint + ": " + Encoding.UTF8.GetString(so.buffer)),

                         DispatcherPriority.Normal);

                     socket.BeginReceive(so.buffer, , StateObject.BUFFER_SIZE, SocketFlags.None,

                         new AsyncCallback(ReceiveCallback), so);

                 }

                 else

                 {

                     Dispatcher.Invoke(() =>

                         {

                             Add2ListView(socket.RemoteEndPoint + ": 客户端连接已断开.");

                             for (int i = ; i < tvRemotes.Items.Count; i++)

                             {

                                 TreeViewItem tvi = (TreeViewItem)tvRemotes.Items[i];

                                 if ((string)tvi.Tag == socket.RemoteEndPoint.ToString())

                                 {

                                     tvRemotes.Items.Remove(tvi);

                                     socketList.Remove(socket);

                                     return;

                                 }

                             }

                         },

                         DispatcherPriority.Normal);

                     socket.Shutdown(SocketShutdown.Both);

                     socket.Close();

                 }

             }

         }

         private void Add2TreeView(string strRemote)

         {

             TreeViewItem tvi = new TreeViewItem();

             tvi.Tag = strRemote;

             StackPanel sp = new StackPanel();

             sp.Orientation = Orientation.Horizontal;

             sp.Children.Add(new PackIcon { Kind = PackIconKind.Devices });

             sp.Children.Add(new TextBlock { Text = $"{strRemote}" });

             tvi.Items.Add(sp);

             tvRemotes.Items.Add(tvi);

         }

         private void Add2ListView(string text)

         {

             TextBlock tb = new TextBlock { Text = text };

             lvDebugs.Items.Add(tb);

         }

     }

 }