RemoveHandler 陳述式

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移除事件與事件處理常式之間的關聯。

語法

RemoveHandler event, AddressOf eventhandler

組件

詞彙 定義
event 要處理之事件的名稱。
eventhandler 目前正在處理事件之程序的名稱。

備註

AddHandler 與 RemoveHandler 陳述式可讓您在程式執行期間隨時啟動及停止特定事件的事件處理。

注意

針對自訂事件，RemoveHandler 陳述式會叫用事件的 RemoveHandler 存取子。 如需有關自訂事件的詳細資訊，請參閱 Event 陳述式。

範例

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

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