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

정의

시퀀스의 모든 요소가 특정 조건에 맞는지 확인합니다.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

형식 매개 변수

TSource

source 요소의 형식입니다.The type of the elements of source.

매개 변수

source
IEnumerable<TSource>

조건자를 적용할 요소가 들어 있는 IEnumerable<T>입니다.An IEnumerable<T> that contains the elements to apply the predicate to.

predicate
Func<TSource,Boolean>

각 요소를 조건에 대해 테스트하는 함수입니다.A function to test each element for a condition.

반환

Boolean

소스 시퀀스의 모든 요소가 지정된 조건자의 테스트를 통과하거나 시퀀스가 비어 있으면 true이고, 그렇지 않으면 false입니다.true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.

예외

source 또는 predicatenull인 경우source or predicate is null.

예제

다음 코드 예제에서는를 사용 하 여 All 시퀀스의 모든 요소가 특정 조건에 맞는지 여부를 확인 하는 방법을 보여 줍니다.The following code example demonstrates how to use All to determine whether all the elements in a sequence satisfy a condition. 변수는 allStartWithB 모든 펫 이름이 "B"로 시작 하거나 배열이 비어 있는 경우 true입니다 pets .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'.

메서드가 반환 하는 부울 값은 All 일반적으로 where 절 ( Where Visual Basic 절)의 조건자 또는 메서드에 대 한 직접 호출에 사용 됩니다 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. 다음 예제에서는 메서드를 사용 하는 방법을 보여 줍니다 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

설명

참고

이 메서드는 컬렉션의 모든 요소를 반환 하지 않습니다.This method does not return all the elements of a collection. 대신 컬렉션의 모든 요소가 조건을 만족 하는지 여부를 확인 합니다.Instead, it determines whether all the elements of a collection satisfy a condition.

source결과를 확인할 수 있는 즉시의 열거형이 중지 됩니다.The enumeration of source is stopped as soon as the result can be determined.

Visual Basic 쿼리 식 구문에서 절은 Aggregate Into All() 의 호출로 변환 All 됩니다.In Visual Basic query expression syntax, an Aggregate Into All() clause translates to an invocation of All.

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