Node.Js + Socket.IO vs SignalR vs C# WebSocket 服务器

Node.Js + Socket.IO vs SignalR vs C# WebSocket - 比较实时通信技术

javascript
// 服务器端代码
const io = require('socket.io')(3000);
io.on('connection', (socket) => {
  console.log('A user connected');
  socket.on('chat message', (msg) => {
    io.emit('chat message', msg);
  });
  socket.on('disconnect', () => {
    console.log('A user disconnected');
  });
});
// 客户端代码
const socket = io('http://localhost:3000');
socket.on('chat message', (msg) => {
  console.log('Received message: ' + msg);
});
socket.emit('chat message', 'Hello, world!');

csharp
// 服务器端代码
using Microsoft.AspNetCore.SignalR;
public class ChatHub : Hub
{
    public async Task SendMessage(string user, string message)
    {
        await Clients.All.SendAsync("ReceiveMessage", user, message);
    }
}
// 客户端代码
const connection = new signalR.HubConnectionBuilder()
    .withUrl("/chatHub")
    .build();
connection.on("ReceiveMessage", (user, message) => {
    console.log(`Received message from ${user}: ${message}`);
});
connection.start().then(() => {
    console.log("Connection established");
});
connection.invoke("SendMessage", "John", "Hello, world!");

csharp
// 服务器端代码
using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;
public class WebSocketHandler
{
    public async Task HandleWebSocket(WebSocket webSocket)
    {
        var buffer = new byte[1024];
        var result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
        while (!result.CloseStatus.HasValue)
        {
            var message = Encoding.UTF8.GetString(buffer, 0, result.Count);
            Console.WriteLine($"Received message: {message}");
            // 处理消息
            result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
        }
        await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
    }
}
// 客户端代码
const webSocket = new WebSocket("ws://localhost:3000");
webSocket.onmessage = (event) => {
    console.log(`Received message: ${event.data}`);
};
webSocket.onopen = () => {
    console.log("Connection established");
};
webSocket.send("Hello, world!");