Updated: July 20, 2015
For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.
Associates an event with an event handler at run time.
AddHandler event, AddressOf eventhandler
The name of the event to handle.
The name of a procedure that handles the event.
RemoveHandler statements allow you to start and stop event handling at any time during program execution.
The signature of the
eventhandler procedure must match the signature of the event
Handles keyword and the
AddHandler statement both allow you to specify that particular procedures handle particular events, but there are differences. The
AddHandler statement connects procedures to events at run time. Use the
Handles keyword when defining a procedure to specify that it handles a particular event. For more information, see Handles.
For custom events, the
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() 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