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Client/App.xaml

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+<Application x:Class="Client.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:Client"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

Client/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Client
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

Client/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

Client/Client.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Util\Util.csproj" />
+  </ItemGroup>
+
+</Project>

Client/MainWindow.xaml

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+<Window x:Class="Client.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:Client" Loaded="Window_Loaded"
+        mc:Ignorable="d" Closing="Window_Closing"
+        Title="端口映射器---ByNemo" Height="300" Width="406">
+    <Grid>
+        <StackPanel Margin="10" x:Name="G1" IsEnabled="False">
+            <WrapPanel  Margin="10 0" HorizontalAlignment="Center">
+                <TextBlock Text="内网IP:" VerticalAlignment="Center" Margin="10"></TextBlock>
+                <TextBox  x:Name="T1" Text="127.0.0.1" IsEnabled="False" Width="100" VerticalAlignment="Center" Margin="10"></TextBox>
+                <TextBlock Text="内网端口:" VerticalAlignment="Center" Margin="10"></TextBlock>
+                <TextBox x:Name="T2" Text="3306" Width="50" VerticalAlignment="Center" Margin="10"></TextBox>
+            </WrapPanel>
+            <WrapPanel  Margin="10 0" HorizontalAlignment="Center">
+                <TextBlock Text="外网IP:" VerticalAlignment="Center" Margin="10"></TextBlock>
+                <TextBox Text="jiyiwm.cn" Width="100" IsEnabled="False" VerticalAlignment="Center" Margin="10"></TextBox>
+                <TextBlock Text="外网端口:" VerticalAlignment="Center" Margin="10"></TextBlock>
+                <TextBox x:Name="T3" Text="4408" Width="50" VerticalAlignment="Center" Margin="10"></TextBox>
+            </WrapPanel>
+            <WrapPanel  Margin="10" HorizontalAlignment="Center">
+                <Button x:Name="button1" Click="button1_Click" Content="应用" HorizontalAlignment="Left" Margin="10" VerticalAlignment="Top" Width="60"/>
+            </WrapPanel>
+        </StackPanel>
+        <StackPanel Margin="10" VerticalAlignment="Bottom">
+            <WrapPanel  Margin="10" HorizontalAlignment="Left">
+                <TextBlock>
+                    <Run Text="当前连接数:"></Run>
+                    <Run x:Name="ConnCount" Foreground="Green" Text="0"></Run>
+                </TextBlock>
+            </WrapPanel>
+        </StackPanel>
+
+
+    </Grid>
+</Window>

Client/MainWindow.xaml.cs

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+using Client.Socket.Map;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace Client
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void button1_Click(object sender, RoutedEventArgs e)
+        {
+            try
+            {
+                Hosts.Open(T1.Text, T2.Text, T3.Text);
+                G1.IsEnabled = false;
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show(ex.Message);
+            }
+        }
+
+        private void Window_Loaded(object sender, RoutedEventArgs e)
+        {
+            try
+            {
+                Hosts.Start();
+                G1.IsEnabled = true;
+                new Thread(() =>
+                {
+                    Thread.Sleep(1000);
+                    ConnCount.Text = Hosts.connectMaps.Count.ToString();
+                })
+                { IsBackground = true }.Start();
+            }
+            catch(Exception ee)
+            {
+                MessageBox.Show(ee.Message);
+                Close();
+            }
+        }
+
+        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
+        {
+            G1.IsEnabled = false;
+            Visibility = Visibility.Hidden;
+            try
+            {
+                Hosts.Close();
+            }
+            catch { }
+        }
+    }
+}

Client/Socket/Map/Hosts.cs

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+using Client.Socket.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading;
+using Util;
+
+namespace Client.Socket.Map
+{
+    public static class Hosts
+    {
+        public static List<ConnectMap> connectMaps = new List<ConnectMap>();
+        public static NetworkStream kongzhins = null;
+
+        public static int serverport = 4999;   //外网主服务端口
+        public static string outip = "jiyiwm.cn";     //外网IP
+
+        public static int outport;   //外网端口
+        public static int inport;    //内网端口
+        public static string inip;      //内网IP
+
+        public static TcpClient tc1;
+        public static TcpClient tc2;
+
+        public static TcpClient tc;
+        public static void Start()
+        {
+            tc = new TcpClient(outip, serverport);
+            kongzhins = tc.GetStream();
+        }
+
+        /// <summary>
+        /// 打开端口
+        /// </summary>
+        /// <param name="ip">内网IP</param>
+        /// <param name="port1">内网端口</param>
+        /// <param name="port2">外网对外端口</param>
+        /// <returns></returns>
+        public static void Open(string ip, string port1, string port2)
+        {
+            try
+            {
+                inport = Convert.ToInt32(port1);
+                inip = ip;
+
+                kongzhins.H_Send($"1,{port2}");
+                string s = kongzhins.H_Recv();
+                string[] r = s.Split(',');
+                if (r[0] == "0")
+                {
+                    throw new Exception("此服务器端口已经被占用");
+                }
+                else if (r[0] == "1")
+                {
+                    outport = Convert.ToInt32(r[1]);
+                    tc1 = new TcpClient(inip, inport);
+                    tc2 = new TcpClient(outip, outport);
+
+                    new Thread(StartLisen) { IsBackground = true }.Start();
+                }
+                else
+                {
+                    throw new Exception("返回数据未知");
+                }
+            }
+            catch (Exception e)
+            {
+                throw new Exception("连接发生错误" + e.Message);
+            }
+        }
+
+        private static void CheckConnect()
+        {
+            connectMaps.ForEach(l =>
+            {
+                if (l.inClient.Connected && l.outClient.Connected) { }
+                else
+                {
+                    l.inClient.Close();
+                    l.inClient.Dispose();
+                    l.outClient.Close();
+                    l.outClient.Dispose();
+                    l.state = 0;
+                }
+            });
+            List<ConnectMap> ss = connectMaps.Where(l => l.state == 0).ToList();
+            ss.ForEach(l =>
+            {
+                connectMaps.Remove(l);
+            });
+        }
+
+        /// <summary>
+        /// 关闭服务
+        /// </summary>
+        public static void Close()
+        {
+            kongzhins.H_Send($"0");
+            kongzhins.Dispose();
+            tc.Close();
+        }
+
+        /// <summary>
+        /// 开启监听
+        /// </summary>
+        private static void StartLisen()
+        {
+            try
+            {
+                connectMaps.Add(new ConnectMap
+                {
+                    inClient = tc1,
+                    outClient = tc2,
+                });
+                PortHelper.Lianjie(tc1, tc2);
+                while (true)
+                {
+                    string s = kongzhins.H_Recv();
+                    string[] r = s.Split(',');
+                    if (r[0] == "1")
+                    {
+                        outport = Convert.ToInt32(r[1]);
+                        TcpClient tc1 = new TcpClient(inip, inport);
+                        TcpClient tc2 = new TcpClient(outip, outport);
+                        connectMaps.Add(new ConnectMap
+                        {
+                            inClient = tc1,
+                            outClient = tc2,
+                        });
+                        PortHelper.Lianjie(tc1, tc2);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                LogHelper.Logger("客户端开启监听出错 " + ex.Message);
+                kongzhins.Dispose();
+                tc.Close();
+            }
+        }
+    }
+}

Client/Socket/Models/ClientModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Client.Socket.Models
+{
+    public class ClientModel
+    {
+        public List<ConnectMap> connectMaps;
+    }
+
+    public class ConnectMap
+    {
+        public TcpClient inClient;
+
+        public TcpClient outClient;
+
+        internal int state = 1;
+    }
+}