Collection(T).SetItem Method
Replaces the element at the specified index.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- index
- Type: System.Int32
The zero-based index of the element to replace.
- item
- Type: T
The new value for the element at the specified index. The value can be a null reference (Nothing in Visual Basic) for reference types.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | index is less than zero. -or- index is greater than Count. |
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 SetItem 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.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.