BindingsCollection.OnCollectionChanging(CollectionChangeEventArgs) Method
Definition
Important
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Raises the CollectionChanging event.
protected:
virtual void OnCollectionChanging(System::ComponentModel::CollectionChangeEventArgs ^ e);protected virtual void OnCollectionChanging (System.ComponentModel.CollectionChangeEventArgs e);abstract member OnCollectionChanging : System.ComponentModel.CollectionChangeEventArgs -> unit
override this.OnCollectionChanging : System.ComponentModel.CollectionChangeEventArgs -> unitProtected Overridable Sub OnCollectionChanging (e As CollectionChangeEventArgs)Parameters
A CollectionChangeEventArgs that contains event data.
Remarks
The CollectionChanging event occurs when the event is about to change.
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnCollectionChanging 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 OnCollectionChanging(CollectionChangeEventArgs) in a derived class, be sure to call the base class's OnCollectionChanging(CollectionChangeEventArgs) method so that registered delegates receive the event.
