eap (event-based asynchronous pattern)

EAP/Client/Client.cs

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+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Client;
+
+internal class Client
+{
+	static void Main(string[] args)
+	{
+		Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+		IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 20000);
+
+		SocketAsyncEventArgs arg = new SocketAsyncEventArgs();
+		arg.RemoteEndPoint = endPoint;
+		arg.Completed += ConnectCompleted;
+		bool pending = socket.ConnectAsync(arg);
+		if (!pending)
+			ConnectCompleted(socket, arg);
+
+		while (true)
+		{
+			Thread.Sleep(1000);
+		}
+	}
+
+	private static void ConnectCompleted(object? sender, SocketAsyncEventArgs e)
+	{
+		if (sender == null || e == null)
+			return;
+
+		Socket socket = (Socket)sender;
+		e.Dispose();
+
+		string str = Console.ReadLine() ?? string.Empty;
+		byte[] buffer = Encoding.UTF8.GetBytes(str);
+
+		SocketAsyncEventArgs arg = new SocketAsyncEventArgs();
+		arg.SetBuffer(buffer, 0, buffer.Length);
+		arg.Completed += SendCompleted;
+		bool pending = socket.SendAsync(arg);
+		if (!pending)
+			SendCompleted(socket, arg);
+	}
+
+	private static void SendCompleted(object? sender, SocketAsyncEventArgs e)
+	{
+		if (sender == null || e == null)
+			return;
+
+		Socket socket = (Socket)sender;
+
+		string str = Console.ReadLine() ?? string.Empty;
+		byte[] buffer = Encoding.UTF8.GetBytes(str);
+
+		e.SetBuffer(buffer, 0, buffer.Length);
+		bool pending = socket.SendAsync(e);
+		if (!pending)
+			SendCompleted(socket, e);
+	}
+}

EAP/Client/Client.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

EAP/EAP.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32929.385
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Server", "Server\Server.csproj", "{8423FCCE-2410-4B71-8760-DB9BF462CD6F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Client", "Client\Client.csproj", "{BAA1EE6E-A707-4BAB-A179-15F48C92FD01}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8423FCCE-2410-4B71-8760-DB9BF462CD6F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8423FCCE-2410-4B71-8760-DB9BF462CD6F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8423FCCE-2410-4B71-8760-DB9BF462CD6F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8423FCCE-2410-4B71-8760-DB9BF462CD6F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BAA1EE6E-A707-4BAB-A179-15F48C92FD01}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BAA1EE6E-A707-4BAB-A179-15F48C92FD01}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BAA1EE6E-A707-4BAB-A179-15F48C92FD01}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BAA1EE6E-A707-4BAB-A179-15F48C92FD01}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {814AD39F-59E2-4A4E-A7E0-3AEA0921C2F1}
+	EndGlobalSection
+EndGlobal

EAP/EAP/EAP.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

EAP/EAP/Program.cs

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+namespace EAP
+{
+	internal class Program
+	{
+		static void Main(string[] args)
+		{
+			Console.WriteLine("Hello, World!");
+		}
+	}
+}

EAP/Server/Server.cs

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+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Server;
+
+internal class Server
+{
+	private static readonly int BUFFER_SIZE = 256;
+
+	static void Main(string[] args)
+	{
+		Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+		IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 20000);
+		serverSocket.Bind(endPoint);
+		serverSocket.Listen(100);
+
+		SocketAsyncEventArgs arg = new SocketAsyncEventArgs();
+		arg.Completed += AcceptCompleted;
+		bool pending = serverSocket.AcceptAsync(arg);
+		if (!pending)
+			AcceptCompleted(serverSocket, arg);
+
+		while (true)
+		{
+			Thread.Sleep(1000);
+		}
+	}
+
+	private static void AcceptCompleted(object? sender, SocketAsyncEventArgs e)
+	{
+		if (sender == null || e == null || e.AcceptSocket == null)
+			return;
+
+		Socket serverSocket = (Socket)sender;
+		Socket clientSocket = e.AcceptSocket;
+		Console.WriteLine(clientSocket.RemoteEndPoint);
+
+		e.AcceptSocket = null;
+		bool pending = serverSocket.AcceptAsync(e);
+		if (!pending)
+			AcceptCompleted(serverSocket, e);
+
+		SocketAsyncEventArgs arg = new SocketAsyncEventArgs();
+		arg.Completed += ReceiveCompleted;
+		byte[] buffer = new byte[BUFFER_SIZE];
+		arg.SetBuffer(buffer, 0, buffer.Length);
+
+		bool pending2 = clientSocket.ReceiveAsync(arg);
+		if (!pending2)
+			ReceiveCompleted(clientSocket, arg);
+	}
+
+	private static void ReceiveCompleted(object? sender, SocketAsyncEventArgs e)
+	{
+		if (sender == null || e == null)
+			return;
+
+		Socket clientSocket = (Socket)sender;
+		if (e.BytesTransferred < 1)
+		{
+			Console.WriteLine("Client is disconnected...");
+			clientSocket.Dispose();
+			e.Dispose();
+			return;
+		}
+
+		Console.WriteLine(Encoding.UTF8.GetString(e.Buffer));
+
+		byte[] buffer = new byte[BUFFER_SIZE];
+		e.SetBuffer(buffer, 0, buffer.Length);
+
+		bool pending = clientSocket.ReceiveAsync(e);
+		if (!pending)
+			ReceiveCompleted(clientSocket, e);
+	}
+}

EAP/Server/Server.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>