c#中websocket接口后端如何调用

在C#中实现WebSocket接口后端的话，可以使用ASP.NET Core中的WebSocket类库来实现。以下是一个简单的示例代码：

using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;

public class WebSocketHandler
{
    private readonly WebSocket _socket;

    public WebSocketHandler(WebSocket socket)
    {
        _socket = socket;
    }

    public async Task HandleWebSocketRequest(HttpContext context)
    {
        var buffer = new byte[1024];
        WebSocketReceiveResult result = await _socket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);

        while (!result.CloseStatus.HasValue)
        {
            // 处理接收到的数据
            string message = System.Text.Encoding.UTF8.GetString(buffer);
            Console.WriteLine($"Received message: {message}");

            // 发送响应数据
            string responseMessage = "Hello from server!";
            byte[] responseBuffer = System.Text.Encoding.UTF8.GetBytes(responseMessage);
            await _socket.SendAsync(new ArraySegment(responseBuffer), WebSocketMessageType.Text, true, CancellationToken.None);

            result = await _socket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
        }

        await _socket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
    }
}

在你的ASP.NET Core应用程序中，可以通过一个中间件来处理WebSocket请求：

app.UseWebSockets();
app.Use(async (context, next) =>
{
    if (context.WebSockets.IsWebSocketRequest)
    {
        WebSocket webSocket = await context.WebSockets.AcceptWebSocketAsync();
        var handler = new WebSocketHandler(webSocket);
        await handler.HandleWebSocketRequest(context);
    }
    else
    {
        await next();
    }
});

在这个示例中，我们创建了一个WebSocketHandler类来处理WebSocket连接，并在中间件中进行处理。当接收到WebSocket请求时，会创建一个新的WebSocketHandler实例，并调用HandleWebSocketRequest方法来处理WebSocket消息。

希望这个简单示例可以帮助你在C#中实现WebSocket接口后端。