Enumerable.Last(Of TSource) Method (IEnumerable(Of TSource), Func(Of TSource, Boolean))

.NET Framework (current version)

Returns the last element of a sequence that satisfies a specified condition.

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

Syntax

<ExtensionAttribute>
Public Shared Function Last(Of TSource) (
	source As IEnumerable(Of TSource),
	predicate As Func(Of TSource, Boolean)
) As TSource

Parameters

source: Type: System.Collections.Generic.IEnumerable(Of TSource)
An IEnumerable(Of T) to return an element from.

predicate: Type: System.Func(Of TSource, Boolean)
A function to test each element for a condition.

Return Value

Type: TSource

The last element in the sequence that passes the test in the specified predicate function.

Type Parameters

TSource: The type of the elements of source.

Exceptions

Exception	Condition
ArgumentNullException	source or predicate is null.
InvalidOperationException	No element satisfies the condition in predicate. -or- The source sequence is empty.

The Last(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Boolean)) method throws an exception if no matching element is found in source. To instead return a default value when no matching element is found, use the LastOrDefault(Of TSource) method.

Examples

The following code example demonstrates how to use Last(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Boolean)) to return the last element of an array that satisfies a condition.

' Create an array of integers.
Dim numbers() As Integer =
{9, 34, 65, 92, 87, 435, 3, 54, 83, 23, 87, 67, 12, 19}

' Get the last element in the array whose value is
' greater than 80.
Dim last As Integer = numbers.Last(Function(num) num > 80)

' Display the result.
MsgBox(last)

' This code produces the following output:
'
' 87

Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1