.NET Framework Class Library
EnumerableElementAtTSource Method

Returns the element at a specified index in a sequence.

Namespace:   System.Linq
Assemblies:   System.Linq (in System.Linq.dll)
  System.Core (in System.Core.dll)
Syntax
<[%$TOPIC/bb299233_en-us_VS_110_1_0_0_0_0%]> _
Public Shared Function ElementAt(Of TSource) ( _
	source As [%$TOPIC/bb299233_en-us_VS_110_1_0_0_0_1%](Of TSource), _
	index As [%$TOPIC/bb299233_en-us_VS_110_1_0_0_0_2%] _
) As TSource
public static TSource ElementAt<TSource>(
	this [%$TOPIC/bb299233_en-us_VS_110_1_0_1_0_0%]<TSource> source,
	[%$TOPIC/bb299233_en-us_VS_110_1_0_1_0_1%] index
)
[[%$TOPIC/bb299233_en-us_VS_110_1_0_2_0_0%]]
public:
generic<typename TSource>
static TSource ElementAt(
	[%$TOPIC/bb299233_en-us_VS_110_1_0_2_0_1%]<TSource>^ source, 
	[%$TOPIC/bb299233_en-us_VS_110_1_0_2_0_2%] index
)
static member ElementAt : 
        source:[%$TOPIC/bb299233_en-us_VS_110_1_0_3_0_0%]<'TSource> * 
        index:[%$TOPIC/bb299233_en-us_VS_110_1_0_3_0_1%] -> 'TSource 
JScript does not support generic types or methods.

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.GenericIEnumerableTSource

An IEnumerableT to return an element from.

index
Type: SystemInt32

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 IEnumerableTSource. 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 .

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 IListT, 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 ElementAtOrDefaultTSource method.

Examples

The following code example demonstrates how to use ElementAtTSource 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
string[] names =
                { "Hartono, Tommy", "Adams, Terry", "Andersen, Henriette Thaulow", 

                    "Hedlund, Magnus", "Ito, Shu" };
            Random random = new Random(DateTime.Now.Millisecond);

            string name = names.ElementAt(random.Next(0, names.Length));

            Console.WriteLine("The name chosen at random is '{0}'.", name);

            /*
             This code produces the following sample output:

             The name chosen at random is 'Ito, Shu'.
            */
Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8