Message in Chinese (Traditional) (中文（繁體）)
這個 WebSocket 執行個體已經有一個未完成的 '<var>X</var>' 呼叫。系統可以同時呼叫 ReceiveAsync 和 SendAsync，但同一時間內各自最多只能有一個未完成的作業。
Unlocalized message
There is already one outstanding '<var>X</var>' 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.
Search by Google