BindingsCollection.OnCollectionChanging(CollectionChangeEventArgs) Method

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

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.

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 -> unit

Protected Overridable Sub OnCollectionChanging (e As CollectionChangeEventArgs)

Parameters

e: CollectionChangeEventArgs

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.

Applies to