^ source, Index index);
public static TSource ElementAt<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Index index);
static member ElementAt : seq<'Source> * Index -> 'Source
<Extension()>
Public Function ElementAt(Of TSource) (source As IEnumerable(Of TSource), index As Index) As TSource
TSource
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static TSource ElementAt(System::Collections::Generic::IEnumerable<TSource> ^ source, int index);
public static TSource ElementAt<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, int index);
static member ElementAt : seq<'Source> * int -> 'Source
<Extension()>
Public Function ElementAt(Of TSource) (source As IEnumerable(Of TSource), index As Integer) As TSource
TSource
{ "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 output similar to the following:
The name chosen at random is 'Ito, Shu'.
' 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.
Console.WriteLine($"The name chosen at random is {name}")
' This code produces output similar to the following:
' The name chosen at random is Ito, Shu
如果实现的类型
source
，则使用该实现
IList<T>
获取指定索引处的元素。 否则，此方法将获取指定的元素。
如果
index
范围不足，此方法将引发异常。 若要在指定索引超过范围时返回默认值，请使用
ElementAtOrDefault
该方法。
