IWebSocketCloseAsync(WebSocketCloseStatus, String, CancellationToken) 方法
            异步关闭WebSocket连接。
            
命名空间: TouchSocket.Http.WebSockets程序集: TouchSocket.Http (在 TouchSocket.Http.dll 中) 版本:4.0.0-beta.143+5fcca7a4e70968794985dc3793adc50531308be6
Task<Result> CloseAsync(
	WebSocketCloseStatus closeStatus,
	string statusDescription,
	CancellationToken cancellationToken = default
)
Function CloseAsync ( 
	closeStatus As WebSocketCloseStatus,
	statusDescription As String,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Result)
abstract CloseAsync : 
        closeStatus : WebSocketCloseStatus * 
        statusDescription : string * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<Result> 
- closeStatus  WebSocketCloseStatus
 - 关闭状态。
 - statusDescription  String
 - 状态描述。
 - cancellationToken  CancellationToken  (Optional)
 - 可取消令箭
 
TaskResult返回一个任务对象,表示异步操作的结果。