OnSetComplete Method

CollectionBase.OnSetComplete Method (Int32, Object, Object)


Performs additional custom processes after setting a value in the CollectionBase instance.

Namespace:   System.Collections
Assembly:  mscorlib (in mscorlib.dll)

protected virtual void OnSetComplete(
	int index,
	object oldValue,
	object newValue


Type: System.Int32

The zero-based index at which oldValue can be found.

Type: System.Object

The value to replace with newValue.

Type: System.Object

The new value of the element at index.

The default implementation of this method is intended to be overridden by a derived class to perform some action after the specified element is set.

The On* methods are invoked only on the instance returned by the List property, but not on the instance returned by the InnerList property.

The collection reverts back to its previous state if one of the following occurs:

  • The process fails.

  • This method is overridden to throw an exception.

The default implementation of this method is an O(1) operation.

Notes to Implementers:

This method allows implementers to define processes that must be performed after setting the specified element in the underlying System.Collections.ArrayList. By defining this method, implementers can add functionality to inherited methods without having to override all other methods.

OnSet is invoked before the standard Set behavior, whereas OnSetComplete is invoked after the standard Set behavior.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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