Queryable.Join Queryable.Join Queryable.Join Queryable.Join Method

定義

一致するキーに基づいて 2 つのシーケンスの要素を相互に関連付けます。Correlates the elements of two sequences based on matching keys.

オーバーロード

Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>)

一致するキーに基づいて 2 つのシーケンスの要素を相互に関連付けます。Correlates the elements of two sequences based on matching keys. キーの比較には既定の等値比較子が使用されます。The default equality comparer is used to compare keys.

Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>)

一致するキーに基づいて 2 つのシーケンスの要素を相互に関連付けます。Correlates the elements of two sequences based on matching keys. 指定された IEqualityComparer<T> を使用してキーを比較します。A specified IEqualityComparer<T> is used to compare keys.

Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>)

一致するキーに基づいて 2 つのシーケンスの要素を相互に関連付けます。Correlates the elements of two sequences based on matching keys. キーの比較には既定の等値比較子が使用されます。The default equality comparer is used to compare keys.

public:
generic <typename TOuter, typename TInner, typename TKey, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable<TResult> ^ Join(System::Linq::IQueryable<TOuter> ^ outer, System::Collections::Generic::IEnumerable<TInner> ^ inner, System::Linq::Expressions::Expression<Func<TOuter, TKey> ^> ^ outerKeySelector, System::Linq::Expressions::Expression<Func<TInner, TKey> ^> ^ innerKeySelector, System::Linq::Expressions::Expression<Func<TOuter, TInner, TResult> ^> ^ resultSelector);
public static System.Linq.IQueryable<TResult> Join<TOuter,TInner,TKey,TResult> (this System.Linq.IQueryable<TOuter> outer, System.Collections.Generic.IEnumerable<TInner> inner, System.Linq.Expressions.Expression<Func<TOuter,TKey>> outerKeySelector, System.Linq.Expressions.Expression<Func<TInner,TKey>> innerKeySelector, System.Linq.Expressions.Expression<Func<TOuter,TInner,TResult>> resultSelector);
static member Join : System.Linq.IQueryable<'Outer> * seq<'Inner> * System.Linq.Expressions.Expression<Func<'Outer, 'Key>> * System.Linq.Expressions.Expression<Func<'Inner, 'Key>> * System.Linq.Expressions.Expression<Func<'Outer, 'Inner, 'Result>> -> System.Linq.IQueryable<'Result>
<Extension()>
Public Function Join(Of TOuter, TInner, TKey, TResult) (outer As IQueryable(Of TOuter), inner As IEnumerable(Of TInner), outerKeySelector As Expression(Of Func(Of TOuter, TKey)), innerKeySelector As Expression(Of Func(Of TInner, TKey)), resultSelector As Expression(Of Func(Of TOuter, TInner, TResult))) As IQueryable(Of TResult)

型パラメーター

TOuter

最初のシーケンスの要素の型。The type of the elements of the first sequence.

TInner

2 番目のシーケンスの要素の型。The type of the elements of the second sequence.

TKey

キー セレクター関数によって返されるキーの型。The type of the keys returned by the key selector functions.

TResult

結果の要素の型。The type of the result elements.

パラメーター

outer
IQueryable<TOuter>

結合する最初のシーケンス。The first sequence to join.

inner
IEnumerable<TInner>

最初のシーケンスに結合するシーケンス。The sequence to join to the first sequence.

outerKeySelector
Expression<Func<TOuter,TKey>>

最初のシーケンスの各要素から結合キーを抽出する関数。A function to extract the join key from each element of the first sequence.

innerKeySelector
Expression<Func<TInner,TKey>>

2 番目のシーケンスの各要素から結合キーを抽出する関数。A function to extract the join key from each element of the second sequence.

resultSelector
Expression<Func<TOuter,TInner,TResult>>

一致する 2 つの要素から結果の要素を作成する関数。A function to create a result element from two matching elements.

戻り値

IQueryable<TResult>

2 つのシーケンスに対して内部結合を実行して取得した TResult 型の要素が格納されている IQueryable<T>An IQueryable<T> that has elements of type TResult obtained by performing an inner join on two sequences.

例外

outerinnerouterKeySelectorinnerKeySelector、または resultSelectornull です。outer or inner or outerKeySelector or innerKeySelector or resultSelector is null.

次のコード例では、をJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>)使用して、共通キーに基づいて2つのシーケンスの内部結合を実行する方法を示します。The following code example demonstrates how to use Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) to perform an inner join of two sequences based on a common key.

class Person
{
    public string Name { get; set; }
}

class Pet
{
    public string Name { get; set; }
    public Person Owner { get; set; }
}

public static void JoinEx1()
{
    Person magnus = new Person { Name = "Hedlund, Magnus" };
    Person terry = new Person { Name = "Adams, Terry" };
    Person charlotte = new Person { Name = "Weiss, Charlotte" };

    Pet barley = new Pet { Name = "Barley", Owner = terry };
    Pet boots = new Pet { Name = "Boots", Owner = terry };
    Pet whiskers = new Pet { Name = "Whiskers", Owner = charlotte };
    Pet daisy = new Pet { Name = "Daisy", Owner = magnus };

    List<Person> people = new List<Person> { magnus, terry, charlotte };
    List<Pet> pets = new List<Pet> { barley, boots, whiskers, daisy };

    // Join the list of Person objects and the list of Pet objects 
    // to create a list of person-pet pairs where each element is 
    // an anonymous type that contains the name of pet and the name
    // of the person that owns the pet.
    var query = people.AsQueryable().Join(pets,
                    person => person,
                    pet => pet.Owner,
                    (person, pet) =>
                        new { OwnerName = person.Name, Pet = pet.Name });

    foreach (var obj in query)
    {
        Console.WriteLine(
            "{0} - {1}",
            obj.OwnerName,
            obj.Pet);
    }
}

/*
    This code produces the following output:

    Hedlund, Magnus - Daisy
    Adams, Terry - Barley
    Adams, Terry - Boots
    Weiss, Charlotte - Whiskers
*/

Structure Person
    Public Name As String
End Structure

Structure Pet
    Public Name As String
    Public Owner As Person
End Structure

Shared Sub JoinEx1()
    Dim magnus As New Person With {.Name = "Hedlund, Magnus"}
    Dim terry As New Person With {.Name = "Adams, Terry"}
    Dim charlotte As New Person With {.Name = "Weiss, Charlotte"}

    Dim barley As New Pet With {.Name = "Barley", .Owner = terry}
    Dim boots As New Pet With {.Name = "Boots", .Owner = terry}
    Dim whiskers As New Pet With {.Name = "Whiskers", .Owner = charlotte}
    Dim daisy As New Pet With {.Name = "Daisy", .Owner = magnus}

    Dim people As New List(Of Person)(New Person() {magnus, terry, charlotte})
    Dim pets As New List(Of Pet)(New Pet() {barley, boots, whiskers, daisy})

    ' Join the list of Person objects and the list of Pet objects 
    ' to create a list of person-pet pairs where each element is 
    ' an anonymous type that contains pet's name and the name of the
    ' Person object that owns the pet.
    Dim query = people.AsQueryable().Join(pets, _
                    Function(person) person, _
                    Function(pet) pet.Owner, _
                    Function(person, pet) _
                        New With {.OwnerName = person.Name, .Pet = pet.Name})

    Dim output As New System.Text.StringBuilder
    For Each obj In query
        output.AppendLine(String.Format( _
            "{0} - {1}", obj.OwnerName, obj.Pet))
    Next

    ' Display the output.
    MsgBox(output.ToString())
End Sub

' This code produces the following output:

' Hedlund, Magnus - Daisy
' Adams, Terry - Barley
' Adams, Terry - Boots
' Weiss, Charlotte - Whiskers

注釈

このメソッドには、型引数が型Expression<TDelegate>の1つ以上の型のFunc<T,TResult>パラメーターが少なくとも1つ含まれています。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. これらのパラメーターの場合は、ラムダ式を渡すことができ、にExpression<TDelegate>コンパイルされます。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

メソッドJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>)は、構築MethodCallExpressionされたJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>)ジェネリックメソッドとして呼び出し元を表すを生成します。The Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) method generates a MethodCallExpression that represents calling Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) itself as a constructed generic method. MethodCallExpressionに、 IQueryProvider CreateQuery<TElement>(Expression) パラメーターouterProviderプロパティによって表されるのメソッドにを渡します。It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the outer parameter.

呼び出しJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>)を表す式ツリーを実行した結果として発生するクエリ動作は、 outerパラメーターの型の実装によって異なります。The query behavior that occurs as a result of executing an expression tree that represents calling Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>) depends on the implementation of the type of the outer parameter. 想定される動作は、内部結合の動作です。The expected behavior is that of an inner join. およびの各関数は、それぞれとinnerからouterキーを抽出するために使用されます。 innerKeySelector outerKeySelectorThe outerKeySelector and innerKeySelector functions are used to extract keys from outer and inner, respectively. これらのキーは、各シーケンスの要素を一致させるために等しいかどうかを比較します。These keys are compared for equality to match elements from each sequence. 要素のペアは、内の要素に一致inner outerする要素ごとに格納されます。A pair of elements is stored for each element in inner that matches an element in outer. 次にresultSelector 、一致する要素の各ペアから結果オブジェクトを射影するために、関数が呼び出されます。Then the resultSelector function is invoked to project a result object from each pair of matching elements.

Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>)

一致するキーに基づいて 2 つのシーケンスの要素を相互に関連付けます。Correlates the elements of two sequences based on matching keys. 指定された IEqualityComparer<T> を使用してキーを比較します。A specified IEqualityComparer<T> is used to compare keys.

public:
generic <typename TOuter, typename TInner, typename TKey, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IQueryable<TResult> ^ Join(System::Linq::IQueryable<TOuter> ^ outer, System::Collections::Generic::IEnumerable<TInner> ^ inner, System::Linq::Expressions::Expression<Func<TOuter, TKey> ^> ^ outerKeySelector, System::Linq::Expressions::Expression<Func<TInner, TKey> ^> ^ innerKeySelector, System::Linq::Expressions::Expression<Func<TOuter, TInner, TResult> ^> ^ resultSelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public static System.Linq.IQueryable<TResult> Join<TOuter,TInner,TKey,TResult> (this System.Linq.IQueryable<TOuter> outer, System.Collections.Generic.IEnumerable<TInner> inner, System.Linq.Expressions.Expression<Func<TOuter,TKey>> outerKeySelector, System.Linq.Expressions.Expression<Func<TInner,TKey>> innerKeySelector, System.Linq.Expressions.Expression<Func<TOuter,TInner,TResult>> resultSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);
static member Join : System.Linq.IQueryable<'Outer> * seq<'Inner> * System.Linq.Expressions.Expression<Func<'Outer, 'Key>> * System.Linq.Expressions.Expression<Func<'Inner, 'Key>> * System.Linq.Expressions.Expression<Func<'Outer, 'Inner, 'Result>> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Linq.IQueryable<'Result>
<Extension()>
Public Function Join(Of TOuter, TInner, TKey, TResult) (outer As IQueryable(Of TOuter), inner As IEnumerable(Of TInner), outerKeySelector As Expression(Of Func(Of TOuter, TKey)), innerKeySelector As Expression(Of Func(Of TInner, TKey)), resultSelector As Expression(Of Func(Of TOuter, TInner, TResult)), comparer As IEqualityComparer(Of TKey)) As IQueryable(Of TResult)

型パラメーター

TOuter

最初のシーケンスの要素の型。The type of the elements of the first sequence.

TInner

2 番目のシーケンスの要素の型。The type of the elements of the second sequence.

TKey

キー セレクター関数によって返されるキーの型。The type of the keys returned by the key selector functions.

TResult

結果の要素の型。The type of the result elements.

パラメーター

outer
IQueryable<TOuter>

結合する最初のシーケンス。The first sequence to join.

inner
IEnumerable<TInner>

最初のシーケンスに結合するシーケンス。The sequence to join to the first sequence.

outerKeySelector
Expression<Func<TOuter,TKey>>

最初のシーケンスの各要素から結合キーを抽出する関数。A function to extract the join key from each element of the first sequence.

innerKeySelector
Expression<Func<TInner,TKey>>

2 番目のシーケンスの各要素から結合キーを抽出する関数。A function to extract the join key from each element of the second sequence.

resultSelector
Expression<Func<TOuter,TInner,TResult>>

一致する 2 つの要素から結果の要素を作成する関数。A function to create a result element from two matching elements.

comparer
IEqualityComparer<TKey>

キーをハッシュして比較する IEqualityComparer<T>An IEqualityComparer<T> to hash and compare keys.

戻り値

IQueryable<TResult>

2 つのシーケンスに対して内部結合を実行して取得した TResult 型の要素が格納されている IQueryable<T>An IQueryable<T> that has elements of type TResult obtained by performing an inner join on two sequences.

例外

outerinnerouterKeySelectorinnerKeySelector、または resultSelectornull です。outer or inner or outerKeySelector or innerKeySelector or resultSelector is null.

注釈

このメソッドには、型引数が型Expression<TDelegate>の1つ以上の型のFunc<T,TResult>パラメーターが少なくとも1つ含まれています。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. これらのパラメーターの場合は、ラムダ式を渡すことができ、にExpression<TDelegate>コンパイルされます。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

メソッドJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>)は、構築MethodCallExpressionされたJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>)ジェネリックメソッドとして呼び出し元を表すを生成します。The Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) method generates a MethodCallExpression that represents calling Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) itself as a constructed generic method. MethodCallExpressionに、 IQueryProvider CreateQuery<TElement>(Expression) パラメーターouterProviderプロパティによって表されるのメソッドにを渡します。It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the outer parameter.

呼び出しJoin<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>)を表す式ツリーを実行した結果として発生するクエリ動作は、 outerパラメーターの型の実装によって異なります。The query behavior that occurs as a result of executing an expression tree that represents calling Join<TOuter,TInner,TKey,TResult>(IQueryable<TOuter>, IEnumerable<TInner>, Expression<Func<TOuter,TKey>>, Expression<Func<TInner,TKey>>, Expression<Func<TOuter,TInner,TResult>>, IEqualityComparer<TKey>) depends on the implementation of the type of the outer parameter. 想定される動作は、内部結合の動作です。The expected behavior is that of an inner join. およびの各関数は、それぞれとinnerからouterキーを抽出するために使用されます。 innerKeySelector outerKeySelectorThe outerKeySelector and innerKeySelector functions are used to extract keys from outer and inner, respectively. これらのキーは、を使用comparerして等しいかどうかを比較します。These keys are compared for equality by using comparer. 比較の結果は、のinner outer要素に一致するの各要素に一致するペアを作成するために使用されます。The outcome of the comparisons is used to create a matching pair for each element in inner that matches an element in outer. 次にresultSelector 、一致する要素の各ペアから結果オブジェクトを射影するために、関数が呼び出されます。Then the resultSelector function is invoked to project a result object from each pair of matching elements.

適用対象