ITypeDescriptorContext.OnComponentChanging Method


Raises the ComponentChanging event.

 bool OnComponentChanging();
public bool OnComponentChanging ();
abstract member OnComponentChanging : unit -> bool
Public Function OnComponentChanging () As Boolean



true if this object can be changed; otherwise, false.


Use the OnComponentChanging method to send notification that an instance of an object is about to be changed. This method also returns a value indicating whether this object can be changed. When false is returned, do not change the object.

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnComponentChanging 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 Implementers

When overriding OnComponentChanging() in a derived class, be sure to call the base class' OnComponentChanging() method so that registered delegates receive the event.

Applies to

See also