C#如何应用webSocket 开发一个中型项目

使用C#开发WebSocket项目可以分为以下几个步骤：

1. 创建WebSocket服务端

使用.NET的WebSocket类库来创建WebSocket服务端。可以在Visual Studio中创建一个新的C#控制台应用程序，并添加WebSocket类库的引用。在代码中创建一个WebSocketServer对象，然后通过监听本地端口来接受连接请求。

using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;

namespace WebSocketServer
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var listener = new HttpListener();
            listener.Prefixes.Add("http://localhost:8080/");
            listener.Start();

            while (true)
            {
                var context = await listener.GetContextAsync();
                if (context.Request.IsWebSocketRequest)
                {
                    var webSocketContext = await context.AcceptWebSocketAsync(null);
                    await HandleWebSocket(webSocketContext.WebSocket);
                }
                else
                {
                    context.Response.StatusCode = 400;
                    context.Response.Close();
                }
            }
        }

        static async Task HandleWebSocket(WebSocket webSocket)
        {
            var buffer = new byte[1024];
            while (webSocket.State == WebSocketState.Open)
            {
                var result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
                if (result.MessageType == WebSocketMessageType.Close)
                {
                    await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);
                }
                else if (result.MessageType == WebSocketMessageType.Text)
                {
                    var message = Encoding.UTF8.GetString(buffer, 0, result.Count);
                    Console.WriteLine($"Received Message: {message}");
                    await webSocket.SendAsync(new ArraySegment<byte>(buffer, 0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);
                }
            }
        }
    }
}

2. 创建WebSocket客户端

同样地，使用.NET的WebSocket类库来创建WebSocket客户端。在代码中创建一个WebSocket对象，然后通过连接到服务端来建立连接。可以使用SendAsync方法向服务端发送消息，使用ReceiveAsync方法接收服务端发送的消息。

using System;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace WebSocketClient
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var client = new ClientWebSocket();
            await client.ConnectAsync(new Uri("ws://localhost:8080/"), CancellationToken.None);

            while (true)
            {
                var message = Console.ReadLine();
                var buffer = Encoding.UTF8.GetBytes(message);
                await client.SendAsync(new ArraySegment<byte>(buffer), WebSocketMessageType.Text, true, CancellationToken.None);

                buffer = new byte[1024];
                var result = await client.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
                var response = Encoding.UTF8.GetString(buffer, 0, result.Count);
                Console.WriteLine($"Received Message: {response}");
            }
        }
    }
}

3. 实现业务逻辑

在WebSocket服务端和客户端中添加具体的业务逻辑，例如实现聊天室、游戏等功能。

以上是使用C#开发WebSocket项目的基本流程，具体实现需要根据具体的业务需求进行调整。