Enumerable.Any(Of TSource) Method (IEnumerable(Of TSource), Func(Of TSource, Boolean))
Determines whether any element of a sequence satisfies a condition.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function Any(Of TSource) ( source As IEnumerable(Of TSource), predicate As Func(Of TSource, Boolean) ) As Boolean
Parameters
- source
-
Type:
System.Collections.Generic.IEnumerable(Of TSource)
An IEnumerable(Of T) whose elements to apply the predicate to.
- predicate
-
Type:
System.Func(Of TSource, Boolean)
A function to test each element for a condition.
Return Value
Type: System.Booleantrue if any elements in the source sequence pass the test in the specified predicate; otherwise, false.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source or predicate is null. |
Note |
|---|
This method does not return any one element of a collection. Instead, it determines whether any elements of a collection satisfy a condition. |
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(Of TSource) to determine whether any element in a sequence satisfies a condition.
Structure Pet Public Name As String Public Age As Integer Public Vaccinated As Boolean End Structure Shared Sub AnyEx3() ' Create a list of Pets Dim pets As New List(Of Pet)(New Pet() _ {New Pet With {.Name = "Barley", .Age = 8, .Vaccinated = True}, New Pet With {.Name = "Boots", .Age = 4, .Vaccinated = False}, New Pet With {.Name = "Whiskers", .Age = 1, .Vaccinated = False}}) ' Determine whether any pets over age 1 are also unvaccinated. Dim unvaccinated As Boolean = pets.Any(Function(pet) pet.Age > 1 And pet.Vaccinated = False) ' Display the output. Dim text As String = IIf(unvaccinated, "are", "are not") MsgBox("There " & text & " unvaccinated animals over age 1.") End Sub ' This code produces the following output: ' ' There are unvaccinated animals over age 1.
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
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