Enumerable..::.ElementAt<(Of <(TSource>)>) Method
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.NET Framework Class Library
Enumerable..::.ElementAt<(Of <(TSource>)>) Method

Returns the element at a specified index in a sequence.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)
Syntax

'Usage

Dim source As IEnumerable(Of TSource)
Dim index As Integer
Dim returnValue As TSource

returnValue = source.ElementAt(index)

'Declaration

<ExtensionAttribute> _
Public Shared Function ElementAt(Of TSource) ( _
    source As IEnumerable(Of TSource), _
    index As Integer _
) As TSource

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic..::.IEnumerable<(Of <(TSource>)>)
An IEnumerable<(Of <(T>)>) to return an element from.
index
Type: System..::.Int32
The zero-based index of the element to retrieve.

Return Value

Type: TSource
The element at the specified position in the source sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<(Of <(TSource>)>). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
Exceptions

ExceptionCondition
ArgumentNullException

source is nullNothingnullptra null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

index is less than 0 or greater than or equal to the number of elements in source.

Remarks

If the type of source implements IList<(Of <(T>)>), that implementation is used to obtain the element at the specified index. Otherwise, this method obtains the specified element.

This method throws an exception if index is out of range. To instead return a default value when the specified index is out of range, use the ElementAtOrDefault<(Of <(TSource>)>) method.

Examples

The following code example demonstrates how to use ElementAt<(Of <(TSource>)>) to return an element at a specific position.

' Create an array of strings.
Dim names() As String = _
    {"Hartono, Tommy", "Adams, Terry", "Andersen, Henriette Thaulow", "Hedlund, Magnus", "Ito, Shu"}

Dim random As Random = New Random(DateTime.Now.Millisecond)

' Get a string at a random index within the array.
Dim name As String = names.ElementAt(random.Next(0, names.Length))

' Display the output.
MsgBox("The name chosen at random is " & name)

' This code produces the following output:
'
' The name chosen at random is Ito, Shu



Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, 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.
Version Information

.NET Framework

Supported in: 3.5

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0
See Also

Reference

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