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

Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.

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

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

Type Parameters


The type of the elements of source.


Type: System.Collections.Generic.IEnumerable(Of TSource)
An IEnumerable(Of T) to return an element from.
Type: System.Func(Of TSource, Boolean)
A function to test each element for a condition.

Return Value

Type: TSource
default(TSource) if the sequence is empty or if no elements pass the test in the predicate function; otherwise, the last element that passes the test in the predicate function.

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).


source or predicate is Nothing.

The default value for reference and nullable types is Nothing.

The following code example demonstrates how to use LastOrDefault(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Boolean)) by passing in a predicate. In the second call to the method, there is no element in the sequence that satisfies the condition.

        ' Create an array of doubles.
        Dim numbers() As Double = {49.6, 52.3, 51.0, 49.4, 50.2, 48.3}

        ' Get the last item whose value rounds to 50.0.
        Dim number50 As Double = _
            numbers.LastOrDefault(Function(n) Math.Round(n) = 50.0)

        Dim output As New System.Text.StringBuilder
        output.AppendLine("The last number that rounds to 50 is " & number50)

        ' Get the last item whose value rounds to 40.0.
        Dim number40 As Double = _
            numbers.LastOrDefault(Function(n) Math.Round(n) = 40.0)

        Dim text As String = IIf(number40 = 0.0, _
                                 "[DOES NOT EXIST]", _
        output.AppendLine("The last number that rounds to 40 is " & text)

        ' Display the output.

        ' This code produces the following output:
        ' The last number that rounds to 50 is 50.2
        ' The last number that rounds to 40 is [DOES NOT EXIST]

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.