WebSockets SendAsync异常

Question

我使用SendAsync方法在一个循环中发送1000条消息，并在下面的代码行中获得异常

await _ws.SendAsync(new ArraySegment<byte>(messageBuffer, offset, count), WebSocketMessageType.Text, lastMessage, _cancellationToken);

我做错了什么？我知道某个地方一定是瓶颈，因为我在发送之间没有睡眠。我是否可以等待某个特定的状态来防止下面的异常？

System.InvalidOperationException was unhandled by user code
  HResult=-2146233079
  Message=There is already one outstanding 'SendAsync' call for this WebSocket instance. ReceiveAsync and SendAsync can be called simultaneously, but at most one outstanding operation for each of them is allowed at the same time.
  Source=System
  StackTrace:
       at System.Net.WebSockets.WebSocketBase.<SendAsyncCore>d__8.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
       at zzz.Stub.WebSocketWrapper.<SendMessageAsync>d__0.MoveNext() in zzz

Answer 1

你不能做并行发送或接收，请记住这一点。既然你在等我，那就好了。

如果您有其他线程发送ping或保持活动消息，这可能是问题所在。

我使用这个库进行负载测试，所以我创建了大量的连接并发送了大量的消息，而且它可以工作。这不是很好，但很有效。