IWebSocketClientClosing 属性
            当WebSocket收到Close报文时触发。
            
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
ClosingEventHandler<IWebSocketClient> Closing { get; set; }
Property Closing As ClosingEventHandler(Of IWebSocketClient)
	Get
	Set
abstract Closing : ClosingEventHandler<IWebSocketClient> with get, set
属性值
ClosingEventHandlerIWebSocketClient