Enumerable.All<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>) Yöntem

Tanım

Bir dizinin tüm öğelerinin bir koşulu karşılayıp karşılamadığını belirler.Determines whether all elements of a sequence satisfy a condition.

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

Tür Parametreleri

TSource

Öğelerinin türü source .The type of the elements of source.

Parametreler

source
IEnumerable<TSource>

IEnumerable<T>Koşulun uygulanacağı öğeleri içeren bir.An IEnumerable<T> that contains the elements to apply the predicate to.

predicate
Func<TSource,Boolean>

Her öğeyi bir koşula göre test etmek için bir işlev.A function to test each element for a condition.

Döndürülenler

Boolean

true kaynak dizinin her öğesi, belirtilen koşuldaki testi geçirir veya dizi boşsa; Aksi takdirde, false .true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.

Özel durumlar

source ya predicate da null .source or predicate is null.

Örnekler

Aşağıdaki kod örneğinde, All bir dizideki tüm öğelerin bir koşulu karşılayıp karşılamadığını belirlemede nasıl kullanılacağı gösterilmektedir.The following code example demonstrates how to use All to determine whether all the elements in a sequence satisfy a condition. Değişken, allStartWithB Tüm Evcil hayvan adları "B" ile başalıyorsa veya pets dizi boşsa doğru olur.Variable allStartWithB is true if all the pet names start with "B" or if the pets array is empty.

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

public static void AllEx()
{
    // Create an array of Pets.
    Pet[] pets = { new Pet { Name="Barley", Age=10 },
                   new Pet { Name="Boots", Age=4 },
                   new Pet { Name="Whiskers", Age=6 } };

    // Determine whether all pet names
    // in the array start with 'B'.
    bool allStartWithB = pets.All(pet =>
                                      pet.Name.StartsWith("B"));

    Console.WriteLine(
        "{0} pet names start with 'B'.",
        allStartWithB ? "All" : "Not all");
}

// This code produces the following output:
//
//  Not all pet names start with 'B'.
Structure Pet
    Public Name As String
    Public Age As Integer
End Structure

Sub AllEx()
    ' Create an array of Pets.
    Dim pets() As Pet =
{New Pet With {.Name = "Barley", .Age = 2},
 New Pet With {.Name = "Boots", .Age = 4},
 New Pet With {.Name = "Whiskers", .Age = 7}}

    ' Determine whether all pet names in the array start with "B".
    Dim allNames As Boolean =
pets.All(Function(ByVal pet) pet.Name.StartsWith("B"))

    ' Display the output.
    Dim text As String = IIf(allNames, "All", "Not all")
    Console.WriteLine($"{text} pet names start with 'B'.")
End Sub

' This code produces the following output:
'
' Not all pet names start with 'B'.

AllYöntemin döndürdüğü Boolean değeri tipik olarak bir where yan tümce ( Where Visual Basic içinde yan tümce) veya yönteme doğrudan çağrı olarak kullanılır Where .The Boolean value that the All method returns is typically used in the predicate of a where clause (Where clause in Visual Basic) or a direct call to the Where method. Aşağıdaki örnek yönteminin bu kullanımını gösterir All .The following example demonstrates this use of the All 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 AllEx2()
{
    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 Pet { Name = "Belle", Age = 8} }},
          new Person { LastName = "Philips",
                       Pets = new Pet[] { new Pet { Name = "Sweetie", Age = 2},
                                          new Pet { Name = "Rover", Age = 13}} }
        };

    // Determine which people have pets that are all older than 5.
    IEnumerable<string> names = from person in people
                                where person.Pets.All(pet => pet.Age > 5)
                                select person.LastName;

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

    /* This code produces the following output:
     *
     * Haas
     * Antebi
     */
}
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 AllEx2()
    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 Pet With {.Name = "Belle", .Age = 8}}},
  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 pets that are all older than 5.
    Dim names = From person In people
                Where person.Pets.All(Function(pet) pet.Age > 5)
                Select person.LastName

    For Each name As String In names
        Console.WriteLine(name)
    Next

    ' This code produces the following output:
    '
    ' Haas
    ' Antebi

End Sub

Açıklamalar

Not

Bu yöntem bir koleksiyonun tüm öğelerini döndürmez.This method does not return all the elements of a collection. Bunun yerine, bir koleksiyondaki tüm öğelerin bir koşulu karşılayıp karşılamadığını belirler.Instead, it determines whether all the elements of a collection satisfy a condition.

sourceSonucu saptandıktan hemen sonra numaralandırma durdurulur.The enumeration of source is stopped as soon as the result can be determined.

Sorgu ifadesi söz dizimi Visual Basic, Aggregate Into All() yan tümce bir çağrısına çevrilir All .In Visual Basic query expression syntax, an Aggregate Into All() clause translates to an invocation of All.

Şunlara uygulanır

Ayrıca bkz.