Replaces the element at the specified index.
Assembly: mscorlib (in mscorlib.dll)
abstract SetItem : index:int * item:'T -> unit override SetItem : index:int * item:'T -> unit
Collection(T) accepts a null reference (Nothing in Visual Basic) as a valid value for reference types and allows duplicate elements.
This method is an O(1) operation.
The following code example shows how to derive a collection class from a constructed type of the Collection(T) generic class, and how to override the protected InsertItem, RemoveItem, ClearItems, and methods to provide custom behavior for the Add, Insert, Remove, and Clear methods, and for setting the Item property.
The custom behavior provided by this example is a Changed notification event that is raised at the end of each of the protected methods. The Dinosaurs class inherits Collection<string> (Collection(Of String) in Visual Basic) and defines the Changed event, which uses a DinosaursChangedEventArgs class for the event information, and an enumeration to identify the kind of change.
The code example calls several properties and methods of Collection(T) to demonstrate the custom event.