在ASP.NET Core中,WebSocket连接的ping和pong消息是由WebSocket协议自动处理的,不需要手动编写代码来处理。如果WebSocket连接的ping消息连续失败了一定次数,连接会自动关闭。
以下是一个简单的ASP.NET Core WebSocket示例,展示了如何使用WebSocket:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;
using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;
public class Startup
{
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseWebSockets();
app.Use(async (context, next) =>
{
if (context.Request.Path == "/ws")
{
if (context.WebSockets.IsWebSocketRequest)
{
WebSocket webSocket = await context.WebSockets.AcceptWebSocketAsync();
await HandleWebSocket(webSocket);
}
else
{
context.Response.StatusCode = 400;
}
}
else
{
await next();
}
});
app.Run(async (context) =>
{
await context.Response.WriteAsync("Hello World!");
});
}
private async Task HandleWebSocket(WebSocket webSocket)
{
byte[] buffer = new byte[1024];
WebSocketReceiveResult result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
while (!result.CloseStatus.HasValue)
{
await webSocket.SendAsync(new ArraySegment(buffer, 0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);
result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
}
await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
}
}
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup();
});
}
在上述代码中,当收到WebSocket连接请求时,我们会通过调用AcceptWebSocketAsync
方法来接受WebSocket连接,并将连接交给HandleWebSocket
方法来处理。在HandleWebSocket
方法中,我们使用ReceiveAsync
方法来接收客户端发送的消息,并通过SendAsync
方法将消息发送回客户端。如果接收到的消息是ping消息,则WebSocket协议会自动处理pong消息的发送。如果连续多次接收ping消息失败,连接会自动关闭。
注意:上述代码只是一个简单的示例,实际应用中可能需要根据具体需求进行修改和扩展。