Enumerable.Any Méthode

Définition

Détermine si les éléments d'une séquence existent ou satisfont à une condition.Determines whether any element of a sequence exists or satisfies a condition.

Surcharges

Any<TSource>(IEnumerable<TSource>)

Détermine si une séquence contient des éléments.Determines whether a sequence contains any elements.

Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

Détermine si des éléments d'une séquence satisfont à une condition.Determines whether any element of a sequence satisfies a condition.

Any<TSource>(IEnumerable<TSource>)

Détermine si une séquence contient des éléments.Determines whether a sequence contains any elements.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool Any(System::Collections::Generic::IEnumerable<TSource> ^ source);
public static bool Any<TSource> (this System.Collections.Generic.IEnumerable<TSource> source);
static member Any : seq<'Source> -> bool
<Extension()>
Public Function Any(Of TSource) (source As IEnumerable(Of TSource)) As Boolean

Paramètres de type

TSource

Le type des éléments de source.The type of the elements of source.

Paramètres

source
IEnumerable<TSource>

IEnumerable<T> à vérifier pour savoir si des éléments y sont présents.The IEnumerable<T> to check for emptiness.

Retours

true si la séquence source contient des éléments ; sinon, false.true if the source sequence contains any elements; otherwise, false.

Exceptions

source a la valeur null.source is null.

Exemples

L’exemple de code suivant montre comment utiliser Any pour déterminer si une séquence contient des éléments.The following code example demonstrates how to use Any to determine whether a sequence contains any elements.

List<int> numbers = new List<int> { 1, 2 };
bool hasElements = numbers.Any();

Console.WriteLine("The list {0} empty.",
    hasElements ? "is not" : "is");

// This code produces the following output:
//
// The list is not empty.
' 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 ", "")
Console.WriteLine($"The list is {text}empty.")

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

La valeur booléenne retournée par la méthode Any<TSource>(IEnumerable<TSource>) est généralement utilisée dans le prédicat d’une clause where (clauseWhere dans Visual Basic) ou un appel direct à la méthode Where<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>).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. L’exemple suivant illustre cette utilisation de la méthode Any.The following example demonstrates this use of the Any method.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}
class Person
{
    public string LastName { get; set; }
    public Pet[] Pets { get; set; }
}

public static void AnyEx2()
{
    List<Person> people = new List<Person>
        { new Person { LastName = "Haas",
                       Pets = new Pet[] { new Pet { Name="Barley", Age=10 },
                                          new Pet { Name="Boots", Age=14 },
                                          new Pet { Name="Whiskers", Age=6 }}},
          new Person { LastName = "Fakhouri",
                       Pets = new Pet[] { new Pet { Name = "Snowball", Age = 1}}},
          new Person { LastName = "Antebi",
                       Pets = new Pet[] { }},
          new Person { LastName = "Philips",
                       Pets = new Pet[] { new Pet { Name = "Sweetie", Age = 2},
                                          new Pet { Name = "Rover", Age = 13}} }
        };

    // Determine which people have a non-empty Pet array.
    IEnumerable<string> names = from person in people
                                where person.Pets.Any()
                                select person.LastName;

    foreach (string name in names)
    {
        Console.WriteLine(name);
    }

    /* This code produces the following output:
      
       Haas
       Fakhouri
       Philips
    */
}
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

Remarques

Notes

Cette méthode ne retourne pas un élément d’une collection.This method does not return any one element of a collection. Au lieu de cela, elle détermine si la collection contient des éléments.Instead, it determines whether the collection contains any elements.

L’énumération de source est arrêtée dès que le résultat peut être déterminé.The enumeration of source is stopped as soon as the result can be determined.

Dans Visual Basic syntaxe d’expression de requête, une clause Aggregate Into Any() se traduit par un appel de Any.In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

Voir aussi

Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

Détermine si des éléments d'une séquence satisfont à une condition.Determines whether any element of a sequence satisfies a condition.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool Any(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, bool> ^ predicate);
public static bool Any<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,bool> predicate);
static member Any : seq<'Source> * Func<'Source, bool> -> bool
<Extension()>
Public Function Any(Of TSource) (source As IEnumerable(Of TSource), predicate As Func(Of TSource, Boolean)) As Boolean

Paramètres de type

TSource

Le type des éléments de source.The type of the elements of source.

Paramètres

source
IEnumerable<TSource>

IEnumerable<T> qui contient les éléments auxquels appliquer le prédicat.An IEnumerable<T> whose elements to apply the predicate to.

predicate
Func<TSource,Boolean>

Fonction permettant de tester chaque élément par rapport à une condition.A function to test each element for a condition.

Retours

true si des éléments de la séquence source réussissent le test dans le prédicat spécifié ; sinon, false.true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.

Exceptions

source ou predicate est null.source or predicate is null.

Exemples

L’exemple de code suivant montre comment utiliser Any pour déterminer si un élément d’une séquence remplit une condition.The following code example demonstrates how to use Any to determine whether any element in a sequence satisfies a condition.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
    public bool Vaccinated { get; set; }
}

public static void AnyEx3()
{
    // Create an array of Pets.
    Pet[] pets =
        { new Pet { Name="Barley", Age=8, Vaccinated=true },
          new Pet { Name="Boots", Age=4, Vaccinated=false },
          new Pet { Name="Whiskers", Age=1, Vaccinated=false } };

    // Determine whether any pets over age 1 are also unvaccinated.
    bool unvaccinated =
        pets.Any(p => p.Age > 1 && p.Vaccinated == false);

    Console.WriteLine(
        "There {0} unvaccinated animals over age one.",
        unvaccinated ? "are" : "are not any");
}

// This code produces the following output:
//
//  There are unvaccinated animals over age one.
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")
    Console.WriteLine($"There {text} unvaccinated animals over age 1.")
End Sub

' This code produces the following output:
'
' There are unvaccinated animals over age 1.

Remarques

Notes

Cette méthode ne retourne pas un élément d’une collection.This method does not return any one element of a collection. Au lieu de cela, elle détermine si des éléments d’une collection satisfont à une condition.Instead, it determines whether any elements of a collection satisfy a condition.

L’énumération de source est arrêtée dès que le résultat peut être déterminé.The enumeration of source is stopped as soon as the result can be determined.

Dans Visual Basic syntaxe d’expression de requête, une clause Aggregate Into Any() se traduit par un appel de Any.In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

Voir aussi

S’applique à