ISerialPortClientConnecting 属性
            准备连接串口的时候
            
命名空间: TouchSocket.SerialPorts程序集: TouchSocket.SerialPorts (在 TouchSocket.SerialPorts.dll 中) 版本:4.0.0-beta.143+5fcca7a4e70968794985dc3793adc50531308be6
ConnectingEventHandler<ISerialPortClient> Connecting { get; set; }
Property Connecting As ConnectingEventHandler(Of ISerialPortClient)
	Get
	Set
abstract Connecting : ConnectingEventHandler<ISerialPortClient> with get, set
属性值
ConnectingEventHandlerISerialPortClient