Enumerable.Any Método

Definición

Determina si un elemento de una secuencia existe o satisface una condición.Determines whether any element of a sequence exists or satisfies a condition.

Sobrecargas

Any<TSource>(IEnumerable<TSource>)

Determina si una secuencia contiene elementos.Determines whether a sequence contains any elements.

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

Determina si algún elemento de una secuencia satisface una condición.Determines whether any element of a sequence satisfies a condition.

Any<TSource>(IEnumerable<TSource>)

Determina si una secuencia contiene elementos.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

Parámetros de tipo

TSource

Tipo de los elementos de source.The type of the elements of source.

Parámetros

source
IEnumerable<TSource>

Interfaz IEnumerable<T> que se va a comprobar si está vacía.The IEnumerable<T> to check for emptiness.

Devoluciones

true si la secuencia de origen contiene elementos; de lo contrario, false.true if the source sequence contains any elements; otherwise, false.

Excepciones

source es null.source is null.

Ejemplos

En el ejemplo de código siguiente se muestra cómo utilizar Any para determinar si una secuencia contiene elementos.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.

El valor booleano que devuelve el método Any<TSource>(IEnumerable<TSource>) se utiliza normalmente en el predicado de una cláusula where (cláusulaWhere en Visual Basic) o una llamada directa al método 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. En el ejemplo siguiente se muestra este uso del método 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

Comentarios

Nota

Este método no devuelve ningún elemento de una colección.This method does not return any one element of a collection. En su lugar, determina si la colección contiene elementos.Instead, it determines whether the collection contains any elements.

La enumeración de source se detiene en cuanto se puede determinar el resultado.The enumeration of source is stopped as soon as the result can be determined.

En Visual Basic sintaxis de las expresiones de consulta, una cláusula de Aggregate Into Any() se convierte en una invocación de Any.In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

Consulte también:

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

Determina si algún elemento de una secuencia satisface una condición.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

Parámetros de tipo

TSource

Tipo de los elementos de source.The type of the elements of source.

Parámetros

source
IEnumerable<TSource>

IEnumerable<T> a cuyos elementos se va a aplicar el predicado.An IEnumerable<T> whose elements to apply the predicate to.

predicate
Func<TSource,Boolean>

Función para probar cada elemento de una condición.A function to test each element for a condition.

Devoluciones

true si algún elemento de la secuencia de origen pasa la prueba del predicado especificado; de lo contrario, false.true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.

Excepciones

source o predicate es null.source or predicate is null.

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar Any para determinar si algún elemento de una secuencia satisface una condición.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.

Comentarios

Nota

Este método no devuelve ningún elemento de una colección.This method does not return any one element of a collection. En su lugar, determina si algún elemento de una colección satisface una condición.Instead, it determines whether any elements of a collection satisfy a condition.

La enumeración de source se detiene en cuanto se puede determinar el resultado.The enumeration of source is stopped as soon as the result can be determined.

En Visual Basic sintaxis de las expresiones de consulta, una cláusula de Aggregate Into Any() se convierte en una invocación de Any.In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

Consulte también:

Se aplica a