c# - .net WebSocket : CloseOutputAsync vs CloseAsync

Question

我们有一个有效的 ASP.NET Web API REST 服务，它在我们 Controller 的一个方法上使用 WebSockets，使用 HttpContext.AcceptWebSocketResponse(..)。

代码看起来像这样的套接字处理程序......

public async Task SocketHandler(AspNetWebSocketContext context)
{
    _webSocket = context.WebSocket;
    ...
    while(!cts.IsCancellationRequested)
    {
        WebSocketReceiveResult result = _webSocket.ReceiveAsync(inputSegment, cts.Token).Result;
        WebSocketState currentSocketState = _webSocket.State;

        if (result.MessageType == WebSocketMessageType.Close ||
            currentSocketState == WebSocketState.CloseReceived)
        {
            // Should I use .CloseAysnc() or .CloseOutputAsync()?
            _webSocket.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "client requested", cts.Token).Wait();
        }

        if (currentSocketState == WebSocketState.Open)
        {
        ...
        }
    }
}

.CloseAsync() 和 CloseOutputAysnc() 有什么区别？我都试过了，它们似乎都工作正常，但肯定有一些区别。它们在 MSDN 上的描述非常相似......

System.Net.WebSockets.CloseAsync -- 使用 WebSocket 协议(protocol)规范第 7 节中定义的关闭握手作为异步操作关闭 WebSocket 连接。

System.Net.WebSockets.CloseOutputAsync -- 启动或完成 WebSocket 协议(protocol)规范第 7 节中定义的关闭握手。

Answer 1

https://www.salmanq.com/blog/5-things-you-probably-didnt-know-about-net-websockets/

...The graceful way is CloseAsync which when initiated sends a message to the connected party, and waits for acknowledgement. ...The other option is to use CloseOutputAsync this is more of a “fire-and-forget” approach. ...

您似乎收到了关闭消息；

if (result.MessageType == WebSocketMessageType.Close ||
            currentSocketState == WebSocketState.CloseReceived)

所以我想说您使用 CloseOutputAsync 会很好，因为您已经收到一条消息“我想关闭此连接”。