asp.net websocket啥技巧

ASP.NET Core WebSocket 提供了一种在客户端和服务器之间进行全双工通信的机制。以下是一些使用 ASP.NET Core WebSocket 的技巧：

1. 安装依赖项：确保安装了 Microsoft.AspNetCore.Http.Abstractions 和 Microsoft.AspNetCore.WebSockets NuGet 包。

2. 配置 WebSocket：在 Startup.cs 文件中配置 WebSocket 中间件。

   public void ConfigureServices(IServiceCollection services)
   {
       services.AddControllersWithViews();
       services.AddWebSocket(options =>
       {
           options.AllowedOrigins = new[] { "*" };
       });
   }
   
   public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
   {
       if (env.IsDevelopment())
       {
           app.UseDeveloperExceptionPage();
       }
       else
       {
           app.UseExceptionHandler("/Home/Error");
           app.UseHsts();
       }
       app.UseHttpsRedirection();
       app.UseStaticFiles();
       app.UseRouting();
   
       app.UseEndpoints(endpoints =>
       {
           endpoints.MapControllerRoute(
               name: "default",
               pattern: "{controller=Home}/{action=Index}/{id?}");
           endpoints.MapWebSocket("/ws", new WebSocketOptions() { KeepAliveInterval = TimeSpan.Zero });
       });
   }
   

3. 处理 WebSocket 连接：创建一个类来处理 WebSocket 连接和消息。

   public class MyWebSocketHandler
   {
       private readonly WebSocket _webSocket;
   
       public MyWebSocketHandler(WebSocket webSocket)
       {
           _webSocket = webSocket;
       }
   
       public async Task OnConnectedAsync(string userId)
       {
           await _webSocket.SendAsync(Encoding.UTF8.GetBytes($"Welcome, {userId}!"));
       }
   
       public async Task OnMessageReceivedAsync(string message)
       {
           var data = https://www.yisu.com/ask/Encoding.UTF8.GetString(message);"Echo: {data}"));
       }
   
       public async Task OnDisconnectedAsync(Exception exception)
       {
           Console.WriteLine($"Disconnected: {exception}");
       }
   }
   

4. 在控制器中使用 WebSocket：在控制器中处理 WebSocket 请求。

   [HttpGet]
   public async Task Index(string id)
   {
       if (HttpContext.WebSockets.IsWebSocketRequest())
       {
           var webSocket = await HttpContext.WebSockets.AcceptWebSocketAsync();
           var handler = new MyWebSocketHandler(webSocket);
           await handler.OnConnectedAsync(id);
   
           while (webSocket.State == WebSocketState.Open)
           {
               var buffer = new byte[1024 * 4];
               WebSocketReceiveResult result;
               do
               {
                   result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
               }
               while (!result.CloseStatus.HasValue);
   
               var message = Encoding.UTF8.GetString(buffer, 0, result.Count);
               await handler.OnMessageReceivedAsync(message);
           }
   
           await handler.OnDisconnectedAsync(null);
       }
   
       return View();
   }
   

5. 客户端代码：在客户端使用 JavaScript 建立 WebSocket 连接。

这些技巧可以帮助你更好地使用 ASP.NET Core WebSocket 进行实时通信。