Queryable.Any 메서드

정의

IQueryable<T> 시퀀스에 요소가 하나라도 있는지 또는 특정 조건에 맞는 요소가 있는지 확인합니다.Determines whether any element of an IQueryable<T> sequence exists or satisfies a condition.

오버로드

Any<TSource>(IQueryable<TSource>)

시퀀스에 요소가 하나라도 있는지 확인합니다.Determines whether a sequence contains any elements.

Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>)

시퀀스에 특정 조건에 맞는 요소가 있는지 확인합니다.Determines whether any element of a sequence satisfies a condition.

Any<TSource>(IQueryable<TSource>)

시퀀스에 요소가 하나라도 있는지 확인합니다.Determines whether a sequence contains any elements.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool Any(System::Linq::IQueryable<TSource> ^ source);
public static bool Any<TSource> (this System.Linq.IQueryable<TSource> source);
static member Any : System.Linq.IQueryable<'Source> -> bool
<Extension()>
Public Function Any(Of TSource) (source As IQueryable(Of TSource)) As Boolean

형식 매개 변수

TSource

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

매개 변수

source
IQueryable<TSource>

비어 있는지 확인할 시퀀스입니다.A sequence to check for being empty.

반환

Boolean

소스 시퀀스에 요소가 하나라도 있으면 true이고, 그렇지 않으면 false입니다.true if the source sequence contains any elements; otherwise, false.

예외

source이(가) null인 경우source is null.

예제

다음 코드 예제에서는를 사용 하 여 Any<TSource>(IQueryable<TSource>) 시퀀스에 요소가 포함 되어 있는지 여부를 확인 하는 방법을 보여 줍니다.The following code example demonstrates how to use Any<TSource>(IQueryable<TSource>) to determine whether a sequence contains any elements.

List<int> numbers = new List<int> { 1, 2 };

// Determine if the list contains any elements.
bool hasElements = numbers.AsQueryable().Any();

Console.WriteLine("The list {0} empty.",
    hasElements ? "is not" : "is");

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

Dim numbers As New List(Of Integer)(New Integer() {1, 2})

' Determine if the list contains any elements.
Dim hasElements As Boolean = numbers.AsQueryable().Any()

MsgBox(String.Format("The list {0} empty.", _
    IIf(hasElements, "is not", "is")))

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

메서드가 반환 하는 부울 값은 Any<TSource>(IQueryable<TSource>) 일반적으로 where 절 ( Where Visual Basic 절)의 조건자 또는 메서드에 대 한 직접 호출에 사용 됩니다 Where<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) .The Boolean value that the Any<TSource>(IQueryable<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>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) method. 다음 예제에서는 메서드를 사용 하는 방법을 보여 줍니다 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.AsQueryable().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.AsQueryable().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

설명

Any<TSource>(IQueryable<TSource>)메서드는 자신을 MethodCallExpression 생성 된 제네릭 메서드로 호출 하는을 생성 합니다 Any<TSource>(IQueryable<TSource>) .The Any<TSource>(IQueryable<TSource>) method generates a MethodCallExpression that represents calling Any<TSource>(IQueryable<TSource>) itself as a constructed generic method. 그런 다음 MethodCallExpression Execute<TResult>(Expression) IQueryProvider Provider 매개 변수의 속성이 나타내는의 메서드에를 전달 합니다 source .It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

호출을 나타내는 식 트리를 실행 한 결과로 발생 하는 쿼리 동작은 Any<TSource>(IQueryable<TSource>) 매개 변수의 형식 구현에 따라 달라 집니다 source .The query behavior that occurs as a result of executing an expression tree that represents calling Any<TSource>(IQueryable<TSource>) depends on the implementation of the type of the source parameter. 예상 되는 동작은에 요소가 포함 되어 있는지 확인 하는 것입니다 source .The expected behavior is that it determines if source contains any elements.

적용 대상

Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>)

시퀀스에 특정 조건에 맞는 요소가 있는지 확인합니다.Determines whether any element of a sequence satisfies a condition.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool Any(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, bool> ^> ^ predicate);
public static bool Any<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,bool>> predicate);
static member Any : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, bool>> -> bool
<Extension()>
Public Function Any(Of TSource) (source As IQueryable(Of TSource), predicate As Expression(Of Func(Of TSource, Boolean))) As Boolean

형식 매개 변수

TSource

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

매개 변수

source
IQueryable<TSource>

해당 요소를 조건에 대해 테스트할 시퀀스입니다.A sequence whose elements to test for a condition.

predicate
Expression<Func<TSource,Boolean>>

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

반환

Boolean

지정된 조건자의 테스트를 통과하는 요소가 소스 시퀀스에 하나라도 있으면 true이고, 그렇지 않으면 false입니다.true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.

예외

source 또는 predicatenull인 경우source or predicate is null.

예제

다음 코드 예제에서는를 사용 하 여 Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) 시퀀스의 요소가 조건을 충족 하는지 여부를 확인 하는 방법을 보여 줍니다.The following code example demonstrates how to use Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) 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 Pet objects.
    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.AsQueryable().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
    Dim Name As String
    Dim Age As Integer
    Dim Vaccinated As Boolean
End Structure

Shared Sub AnyEx3()
    ' Create an array of Pet objects.
    Dim pets() As 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.AsQueryable().Any(Function(p) p.Age > 1 And p.Vaccinated = False)

    MsgBox(String.Format( _
        "There {0} unvaccinated animals over age one.", _
        IIf(unvaccinated, "are", "are not any") _
    ))
End Sub

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

설명

이 메서드에 형식 인수가 형식 중 하나인 형식의 매개 변수가 하나 이상 있습니다 Expression<TDelegate> Func<T,TResult> .This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. 이러한 매개 변수는 람다 식을 전달할 수 있으며로 컴파일됩니다 Expression<TDelegate> .For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>)메서드는 자신을 MethodCallExpression 생성 된 제네릭 메서드로 호출 하는을 생성 합니다 Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) .The Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) method generates a MethodCallExpression that represents calling Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) itself as a constructed generic method. 그런 다음 MethodCallExpression Execute<TResult>(Expression) IQueryProvider Provider 매개 변수의 속성이 나타내는의 메서드에를 전달 합니다 source .It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

호출을 나타내는 식 트리를 실행 한 결과로 발생 하는 쿼리 동작은 Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) 매개 변수의 형식 구현에 따라 달라 집니다 source .The query behavior that occurs as a result of executing an expression tree that represents calling Any<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) depends on the implementation of the type of the source parameter. 예상 되는 동작은의 요소가에 지정 된 조건을 만족 하는지 확인 하는 것입니다 source predicate .The expected behavior is that it determines if any of the elements of source satisfy the condition specified by predicate.

적용 대상