Enumerable.Any(Of TSource) Method (IEnumerable(Of TSource), Func(Of TSource, Boolean))
Determines whether any element of a sequence satisfies a condition.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
'Declaration <ExtensionAttribute> _ Public Shared Function Any(Of TSource) ( _ source As IEnumerable(Of TSource), _ predicate As Func(Of TSource, Boolean) _ ) As Boolean
Type Parameters
- TSource
The type of the elements of source.
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.
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.| Exception | Condition |
|---|---|
| ArgumentNullException | source or predicate is Nothing. |
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 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") outputBlock.Text += "There " & text & " unvaccinated animals over age 1." & vbCrLf End Sub ' This code produces the following output: ' ' There are unvaccinated animals over age 1.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
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