RemoveHandler Statement
Removes the association between an event and an event handler.
Syntax
RemoveHandler event, AddressOf eventhandler
Parts
Term | Definition |
---|---|
event |
The name of the event being handled. |
eventhandler |
The name of the procedure currently handling the event. |
Remarks
The AddHandler
and RemoveHandler
statements allow you to start and stop event handling for a specific event at any time during program execution.
Note
For custom events, the RemoveHandler
statement invokes the event's RemoveHandler
accessor. For more information on custom events, see Event Statement.
Example
Sub TestEvents()
Dim Obj As New Class1
' Associate an event handler with an event.
AddHandler Obj.Ev_Event, AddressOf EventHandler
' Call the method to raise the event.
Obj.CauseSomeEvent()
' Stop handling events.
RemoveHandler Obj.Ev_Event, AddressOf EventHandler
' This event will not be handled.
Obj.CauseSomeEvent()
' Associate an event handler with an event, using a lambda.
' This handler cannot be removed.
AddHandler Obj.Ev_Event, Sub ()
MsgBox("Lambda caught event.")
End Sub
' This event will be handled by the lambda above.
Obj.CauseSomeEvent()
End Sub
Sub EventHandler()
' Handle the event.
MsgBox("EventHandler caught event.")
End Sub
Public Class Class1
' Declare an event.
Public Event Ev_Event()
Sub CauseSomeEvent()
' Raise an event.
RaiseEvent Ev_Event()
End Sub
End Class
See also
التعاون معنا على GitHub
يمكن العثور على مصدر هذا المحتوى على GitHub حيث يمكنك أيضاً إضافة مشاكل وطلبات سحب ومراجعتها. للحصول على معلومات إضافية، اطلع على دليل المساهم لدينا.
الملاحظات
https://aka.ms/ContentUserFeedback.
قريبًا: خلال عام 2024، سنتخلص تدريجيًا من GitHub Issues بوصفها آلية إرسال ملاحظات للمحتوى ونستبدلها بنظام ملاحظات جديد. لمزيد من المعلومات، راجعإرسال الملاحظات وعرضها المتعلقة بـ