Enumerable.Any Enumerable.Any Enumerable.Any Enumerable.Any Method

Definizione

Determina se qualsiasi elemento di una sequenza esiste o soddisfa una condizione.Determines whether any element of a sequence exists or satisfies a condition.

Overload

Any<TSource>(IEnumerable<TSource>) Any<TSource>(IEnumerable<TSource>) Any<TSource>(IEnumerable<TSource>) Any<TSource>(IEnumerable<TSource>)

Determina se una sequenza contiene elementi.Determines whether a sequence contains any elements.

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

Determina se un elemento di una sequenza soddisfa una condizione.Determines whether any element of a sequence satisfies a condition.

Any<TSource>(IEnumerable<TSource>) Any<TSource>(IEnumerable<TSource>) Any<TSource>(IEnumerable<TSource>) Any<TSource>(IEnumerable<TSource>)

Determina se una sequenza contiene elementi.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

Parametri di tipo

TSource

Tipo degli elementi di source.The type of the elements of source.

Parametri

source
IEnumerable<TSource>

Il IEnumerable<T> per verificare il contenuto.The IEnumerable<T> to check for emptiness.

Restituisce

true Se la sequenza di origine contiene elementi; in caso contrario, false.true if the source sequence contains any elements; otherwise, false.

Eccezioni

Esempi

Esempio di codice seguente viene illustrato come utilizzare Any per determinare se una sequenza contiene elementi.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 ", "")
MsgBox("The list is " & text & "empty.")

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

Il valore booleano che il Any<TSource>(IEnumerable<TSource>) metodo restituisce in genere viene utilizzato nel predicato di un where clausola (Where clausola in Visual Basic) o una chiamata diretta al Where<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>) (metodo).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'esempio seguente illustra l'uso del Any (metodo).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

Commenti

Nota

Questo metodo non restituisce qualsiasi un elemento di una raccolta.This method does not return any one element of a collection. Al contrario, determina se la raccolta contiene elementi.Instead, it determines whether the collection contains any elements.

L'enumerazione di source viene arrestato, non appena il risultato può essere determinato.The enumeration of source is stopped as soon as the result can be determined.

In Visual Basic sintassi delle espressioni di query, un Aggregate Into Any() clausola viene convertita in una chiamata di Any.In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

Vedi anche

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

Determina se un elemento di una sequenza soddisfa una condizione.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

Parametri di tipo

TSource

Tipo degli elementi di source.The type of the elements of source.

Parametri

source
IEnumerable<TSource>

Un IEnumerable<T> ai cui elementi applicare il predicato.An IEnumerable<T> whose elements to apply the predicate to.

predicate
Func<TSource,Boolean>

Funzione per testare ogni elemento rispetto a una condizione.A function to test each element for a condition.

Restituisce

true Se qualsiasi elemento nella sequenza di origine supera il test nel predicato specificato. in caso contrario, false.true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.

Eccezioni

source o predicate è null.source or predicate is null.

Esempi

Esempio di codice seguente viene illustrato come utilizzare Any per determinare se un elemento in una sequenza soddisfa una condizione.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")
    MsgBox("There " & text & " unvaccinated animals over age 1.")
End Sub

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

Commenti

Nota

Questo metodo non restituisce qualsiasi un elemento di una raccolta.This method does not return any one element of a collection. Al contrario, determina se eventuali elementi della raccolta soddisfano una condizione.Instead, it determines whether any elements of a collection satisfy a condition.

L'enumerazione di source viene arrestato, non appena il risultato può essere determinato.The enumeration of source is stopped as soon as the result can be determined.

In Visual Basic sintassi delle espressioni di query, un Aggregate Into Any() clausola viene convertita in una chiamata di Any.In Visual Basic query expression syntax, an Aggregate Into Any() clause translates to an invocation of Any.

Vedi anche

Si applica a