Component.CanRaiseEvents Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets a value indicating whether the component can raise an event.
protected:
virtual property bool CanRaiseEvents { bool get(); };
protected virtual bool CanRaiseEvents { get; }
member this.CanRaiseEvents : bool
Protected Overridable ReadOnly Property CanRaiseEvents As Boolean
Property Value
true
if the component can raise events; otherwise, false
. The default is true
.
Remarks
The default implementation of this property always returns true
. Classes that inherit from the Component class should override this property to provide the ability to disable the raising of events. For example, in the Control class, if the control is being hosted as an ActiveX control, the CanRaiseEvents property returns false
if the ActiveX control has its events frozen.
Notes to Inheritors
If you override this method in a deriving class and change it to return false
, the EventHandlerList collection returned by the Events property returns null
for an event. Events can still be added and removed from the collection, but the collection's Item[Object] property will always return null
.
Applies to
See also
反馈
https://aka.ms/ContentUserFeedback。
即将发布:在整个 2024 年,我们将逐步淘汰作为内容反馈机制的“GitHub 问题”,并将其取代为新的反馈系统。 有关详细信息,请参阅:提交和查看相关反馈