ToolStripDropDown.OnOpening(CancelEventArgs) Method
Definition
Important
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Raises the Opening event.
protected:
virtual void OnOpening(System::ComponentModel::CancelEventArgs ^ e);protected virtual void OnOpening (System.ComponentModel.CancelEventArgs e);abstract member OnOpening : System.ComponentModel.CancelEventArgs -> unit
override this.OnOpening : System.ComponentModel.CancelEventArgs -> unitProtected Overridable Sub OnOpening (e As CancelEventArgs)Parameters
A CancelEventArgs that contains the event data.
Remarks
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnOpening method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors
When overriding OnOpening(CancelEventArgs) in a derived class, be sure to call the base class's OnOpening(CancelEventArgs) method so that registered delegates receive the event.
