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Collection(T).SetItem Method

Replaces the element at the specified index.

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

abstract SetItem : 
        index:int * 
        item:'T -> unit  
override SetItem : 
        index:int * 
        item:'T -> unit

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.

ExceptionCondition
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.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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