【背景】

封闭环境无法拷贝外来的远程桌面软件，所以就直接自己用C#写一个。

【效果】

【说明】

本篇会给出完整的编程步骤，照着写就能拥有你自己的远程桌面应用，直接可以运行在局域网。
如果不想自己敲代码，也可以选择直接下载项目资源，解包后直接用VS2019打开即可运行或自行打包成exe：
https://download.csdn.net/download/weixin_41697242/88350078

【设计】

远程桌面需要一个服务端，一个客户端，各自是一个项目文件。
本项目中客户端分享画面（发送截屏数据流），服务端则是监听并接收画面，因此服务端需要两个Form（窗体）。

【项目源码】

客户端UI

只需要一个Form1，布局如下：

具体组件和属性设置如下：
Label1，text改为IP即可；
Label2，text改为Port即可；
textbox1，名称改为txtIP；
textbox2，名称改为txtPort，text改为80
button1，text改为Connect，名称改为btnConnect
button2，text改为ShareScreen，名称改为btnShare

客户端源码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;using System.Net.Sockets;
using System.Drawing.Imaging;
using System.Runtime.Serialization.Formatters.Binary;namespace OriginalClient
{public partial class Form1 : Form{private readonly TcpClient client = new TcpClient();private NetworkStream mainStream;private int portNumber;private static Image GrabDesktop(){Rectangle bound = Screen.PrimaryScreen.Bounds;Bitmap screenshot = new Bitmap(bound.Width, bound.Height, PixelFormat.Format32bppArgb);Graphics graphics = Graphics.FromImage(screenshot);graphics.CopyFromScreen(bound.X, bound.Y, 0, 0, bound.Size, CopyPixelOperation.SourceCopy);return screenshot;}private void SendDesktopImage(){BinaryFormatter binFormatter = new BinaryFormatter();mainStream = client.GetStream();binFormatter.Serialize(mainStream, GrabDesktop());}public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){btnShare.Enabled = false;}private void btnConnect_Click(object sender, EventArgs e){portNumber = int.Parse(txtPort.Text);try{client.Connect(txtIP.Text, portNumber);btnConnect.Text = "Connected";MessageBox.Show("Connected");btnConnect.Enabled = false;btnShare.Enabled = true;}catch (Exception){MessageBox.Show("Failed to connect");btnConnect.Text = "Not Connected";}}private void btnShare_Click(object sender, EventArgs e){if (btnShare.Text.StartsWith("Share")){timer1.Start();btnShare.Text = "Stop Sharing";}else {timer1.Stop();btnShare.Text = "Share My Screen";}}private void timer1_Tick(object sender, EventArgs e){SendDesktopImage();}}
}

服务端UI

Form1

textBox1，name设置为txtPort
button1，name设置为btnListen

Form1代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace OriginalServer
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){}private void btnListen_Click(object sender, EventArgs e){new Form2(int.Parse(txtPort.Text)).Show();btnListen.Enabled = false;}}
}

Form2

源项目中追加一个窗体。
一个窗体里放一个imageBox，mode设置为zoom，dock设置为停靠。

Form2源码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;using System.Net.Sockets;
using System.Net;
using System.Threading;
using System.Runtime.Serialization.Formatters.Binary;namespace OriginalServer
{public partial class Form2 : Form{private readonly int port;private TcpClient client;private TcpListener server;private NetworkStream mainStream;private readonly Thread Listening;private readonly Thread GetImage;public Form2(int Port){port = Port;client = new TcpClient();Listening = new Thread(StartListening);GetImage = new Thread(Receiveimage);InitializeComponent();}private void StartListening(){while (!client.Connected) {server.Start();client = server.AcceptTcpClient();}GetImage.Start();}private void StopListening() {server.Stop();client = null;if (Listening.IsAlive) Listening.Abort();if (GetImage.IsAlive) Listening.Abort();}private void Receiveimage(){BinaryFormatter binFormatter = new BinaryFormatter();while (client.Connected) {mainStream = client.GetStream();pictureBox1.Image = (Image)binFormatter.Deserialize(mainStream);}}protected override void OnLoad(EventArgs e){base.OnLoad(e);server = new TcpListener(IPAddress.Any, port);Listening.Start();}protected override void OnFormClosing(FormClosingEventArgs e){base.OnFormClosing(e);StopListening();}private void pictureBox1_Click(object sender, EventArgs e){}private void Form2_Load(object sender, EventArgs e){}}
}