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.NET Framework Class Library

Enumerable.Any<TSource> Method (IEnumerable<TSource>)

Determines whether a sequence contains any elements.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)
<ExtensionAttribute> _
Public Shared Function Any(Of TSource) ( _
	source As IEnumerable(Of TSource) _
) As Boolean

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic.IEnumerable<TSource>

The IEnumerable<T> to check for emptiness.

Return Value

Type: System.Boolean
true if the source sequence contains any elements; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<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).
Exception Condition
ArgumentNullException

source is null.

Note Note

This method does not return any one element of a collection. Instead, it determines whether the collection contains any elements.

The enumeration of source is stopped as soon as the result can be determined.

In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

The following code example demonstrates how to use Any to determine whether a sequence contains any elements.

        ' Create a list of Integers. 
        Dim numbers As New List(Of Integer)(New Integer() {1, 2})

        ' Determine if the list contains any items. 
        Dim hasElements As Boolean = numbers.Any()

        ' Display the output. 
        Dim text As String = IIf(hasElements, "not ", "")
        MsgBox("The list is " & text & "empty.")

        ' This code produces the following output: 
        
        ' The list is not empty.

The Boolean value that the Any<TSource>(IEnumerable<TSource>) method returns is typically used in the predicate of a where clause (Where clause in Visual Basic) or a direct call to the Where<TSource>(IEnumerable<TSource>, Func<TSource, Boolean>) method. The following example demonstrates this use of the Any method.

Structure Pet
    Public Name As String 
    Public Age As Integer 
End Structure 

Structure Person
    Public LastName As String 
    Public Pets() As Pet
End Structure 

Sub AnyEx2()
    Dim people As New List(Of Person)(New Person() _
        {New Person With {.LastName = "Haas", _
                          .Pets = New Pet() {New Pet With {.Name = "Barley", .Age = 10}, _
                                             New Pet With {.Name = "Boots", .Age = 14}, _
                                             New Pet With {.Name = "Whiskers", .Age = 6}}}, _
          New Person With {.LastName = "Fakhouri", _
                           .Pets = New Pet() {New Pet With {.Name = "Snowball", .Age = 1}}}, _
          New Person With {.LastName = "Antebi", _
                           .Pets = New Pet() {}}, _
          New Person With {.LastName = "Philips", _
                           .Pets = New Pet() {New Pet With {.Name = "Sweetie", .Age = 2}, _
                                              New Pet With {.Name = "Rover", .Age = 13}}}})

    ' Determine which people have a non-empty Pet array. 
    Dim names = From person In people _
                Where person.Pets.Any() _
                Select person.LastName

    For Each name As String In names
        Console.WriteLine(name)
    Next 

    ' This code produces the following output: 
    
    ' Haas 
    ' Fakhouri 
    ' Philips 

End Sub

.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