Enumerable.Any Metode

  • Referensi

Definisi

Ruang nama:
System.Linq
Rakitan:
System.Linq.dll
Rakitan:
System.Core.dll
Rakitan:
netstandard.dll

Menentukan apakah ada elemen urutan atau memenuhi kondisi.

Overload

Any<TSource>(IEnumerable<TSource>)

Menentukan apakah urutan berisi elemen apa pun.
Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

Menentukan apakah ada elemen urutan yang memenuhi kondisi.

Any<TSource>(IEnumerable<TSource>)

Sumber:
AnyAll.cs
Sumber:
AnyAll.cs
Sumber:
AnyAll.cs

Menentukan apakah urutan berisi elemen apa pun.

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

Jenis parameter

TSource

Jenis elemen source.

Parameter

source
IEnumerable<TSource>

Untuk IEnumerable<T> memeriksa kekosongan.

Mengembalikan

Boolean

true jika urutan sumber berisi elemen apa pun; jika tidak, false.

Pengecualian

ArgumentNullException

sourceadalah null.

Contoh

Contoh kode berikut menunjukkan cara menggunakan Any untuk menentukan apakah urutan berisi elemen apa pun.

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.

Nilai Boolean yang Any<TSource>(IEnumerable<TSource>) dikembalikan metode biasanya digunakan dalam predikat where klausa (Where klausa di Visual Basic) atau panggilan langsung ke Where<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>) metode . Contoh berikut menunjukkan penggunaan Any metode ini.

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

Keterangan

Catatan

Metode ini tidak mengembalikan satu elemen pun dari koleksi. Sebaliknya, ia menentukan apakah koleksi berisi elemen apa pun.

Enumerasi source dihentikan segera setelah hasilnya dapat ditentukan.

Dalam sintaks ekspresi kueri Visual Basic, Aggregate Into Any() klausa diterjemahkan ke pemanggilan Any.

Lihat juga

Berlaku untuk

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

Sumber:
AnyAll.cs
Sumber:
AnyAll.cs
Sumber:
AnyAll.cs

Menentukan apakah ada elemen urutan yang memenuhi kondisi.

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

Jenis parameter

TSource

Jenis elemen source.

Parameter

source
IEnumerable<TSource>

Elemen IEnumerable<T> yang akan menerapkan predikat.

predicate
Func<TSource,Boolean>

Fungsi untuk menguji setiap elemen untuk suatu kondisi.

Mengembalikan

Boolean

true jika urutan sumber tidak kosong dan setidaknya salah satu elemennya lulus tes dalam predikat yang ditentukan; jika tidak, false.

Pengecualian

ArgumentNullException

source atau predicate adalah null.

Contoh

Contoh kode berikut menunjukkan cara menggunakan Any untuk menentukan apakah ada elemen dalam urutan yang memenuhi kondisi.

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.

Keterangan

Catatan

Metode ini tidak mengembalikan satu elemen pun dari koleksi. Sebaliknya, ia menentukan apakah ada elemen koleksi yang memenuhi suatu kondisi.

Enumerasi source dihentikan segera setelah hasilnya dapat ditentukan.

Dalam sintaks ekspresi kueri Visual Basic, Aggregate Into Any() klausa diterjemahkan ke pemanggilan Any.

Lihat juga

Berlaku untuk