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ReadOnlyCollection<T>.IList.Item Property

Gets the element at the specified index. A NotSupportedException occurs if you try to set the item at the specified index.

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

Object IList.this[
	int index
] { get; set; }

Parameters

index
Type: System.Int32

The zero-based index of the element to get.

Property Value

Type: System.Object
The element at the specified index.

Implements

IList.Item

ExceptionCondition
ArgumentOutOfRangeException

index is not a valid index in the IList.

NotSupportedException

Always thrown if the property is set.

This property provides the ability to access a specific element in the collection by using the following syntax: myCollection[index].

The C# language uses the this keyword to define the indexers instead of implementing the IList.Item property. Visual Basic implements IList.Item as a default property, which provides the same indexing functionality.

Retrieving the value of this property is an O(1) operation.

This member is an explicit interface member implementation. It can be used only when the ReadOnlyCollection<T> instance is cast to an IDisposable interface.

.NET Framework

Supported in: 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 Silverlight 8.1, Windows Phone Silverlight 8

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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