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ReadOnlyCollection<T>.IList.Item Property

.NET Framework 4.5

Gets or sets the element 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

Exceptions

Exception	Condition
ArgumentOutOfRangeException	index is not a valid index in the IList.
NotSupportedException	Always thrown if the property is set.

Remarks

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.

Version Information

.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

Platforms

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.

Reference

ReadOnlyCollection<T> Class

System.Collections.ObjectModel Namespace

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