Queryable.ThenBy Queryable.ThenBy Queryable.ThenBy Queryable.ThenBy Method

定義

シーケンス内の後続の要素を昇順で配置します。Performs a subsequent ordering of the elements in a sequence in ascending order.

オーバーロード

ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>)

指定された比較子を使用して、シーケンス内の後続の要素を昇順で配置します。Performs a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer.

ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>)

キーに従って、シーケンス内の後続の要素を昇順で配置します。Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.

ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>)

指定された比較子を使用して、シーケンス内の後続の要素を昇順で配置します。Performs a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer.

public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IOrderedQueryable<TSource> ^ ThenBy(System::Linq::IOrderedQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector, System::Collections::Generic::IComparer<TKey> ^ comparer);
public static System.Linq.IOrderedQueryable<TSource> ThenBy<TSource,TKey> (this System.Linq.IOrderedQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer);
static member ThenBy : System.Linq.IOrderedQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> * System.Collections.Generic.IComparer<'Key> -> System.Linq.IOrderedQueryable<'Source>
<Extension()>
Public Function ThenBy(Of TSource, TKey) (source As IOrderedQueryable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey)), comparer As IComparer(Of TKey)) As IOrderedQueryable(Of TSource)

型パラメーター

TSource

source の要素の型。The type of the elements of source.

TKey

keySelector で表された関数によって返されるキーの型。The type of the key returned by the function represented by keySelector.

パラメーター

source
IOrderedQueryable<TSource>

並べ替える要素を格納している IOrderedQueryable<T>An IOrderedQueryable<T> that contains elements to sort.

keySelector
Expression<Func<TSource,TKey>>

各要素からキーを抽出する関数。A function to extract a key from each element.

comparer
IComparer<TKey>

キーを比較する IComparer<T>An IComparer<T> to compare keys.

戻り値

要素がキーに従って並べ替えられている IOrderedQueryable<T>An IOrderedQueryable<T> whose elements are sorted according to a key.

例外

sourcekeySelector、または comparer は、null です。source or keySelector or comparer 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ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>)は、構築MethodCallExpressionされたThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<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 ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) method generates a MethodCallExpression that represents calling ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) itself as a constructed generic method. MethodCallExpressionに、 IQueryProvider CreateQuery<TElement>(Expression) パラメーターsourceProvider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 source parameter. を呼び出しCreateQuery<TElement>(Expression)た結果が型IOrderedQueryable<T>にキャストされ、が返されます。The result of calling CreateQuery<TElement>(Expression) is cast to type IOrderedQueryable<T> and returned.

呼び出しThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<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、 source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 ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) depends on the implementation of the type of the source parameter. 期待される動作は、のsource source各要素に対してを呼び出すkeySelectorことによって取得したキーに基づいて、の要素の2番目の並べ替えを実行することです。The expected behavior is that it performs a secondary sort of the elements of source based on the key obtained by invoking keySelector on each element of source. 以前に確立されたすべての並べ替え順序は保持されます。All previously established sort orders are preserved. パラメーター comparerは、キー値の比較に使用されます。The comparer parameter is used to compare key values.

ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>)

キーに従って、シーケンス内の後続の要素を昇順で配置します。Performs a subsequent ordering of the elements in a sequence in ascending order according to a key.

public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
 static System::Linq::IOrderedQueryable<TSource> ^ ThenBy(System::Linq::IOrderedQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector);
public static System.Linq.IOrderedQueryable<TSource> ThenBy<TSource,TKey> (this System.Linq.IOrderedQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector);
static member ThenBy : System.Linq.IOrderedQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> -> System.Linq.IOrderedQueryable<'Source>
<Extension()>
Public Function ThenBy(Of TSource, TKey) (source As IOrderedQueryable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey))) As IOrderedQueryable(Of TSource)

型パラメーター

TSource

source の要素の型。The type of the elements of source.

TKey

keySelector で表された関数によって返されるキーの型。The type of the key returned by the function represented by keySelector.

パラメーター

source
IOrderedQueryable<TSource>

並べ替える要素を格納している IOrderedQueryable<T>An IOrderedQueryable<T> that contains elements to sort.

keySelector
Expression<Func<TSource,TKey>>

各要素からキーを抽出する関数。A function to extract a key from each element.

戻り値

要素がキーに従って並べ替えられている IOrderedQueryable<T>An IOrderedQueryable<T> whose elements are sorted according to a key.

例外

source または keySelectornull です。source or keySelector is null.

次のコード例は、を使用ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>)して、シーケンス内の要素の2番目の順序を実行する方法を示しています。The following code example demonstrates how to use ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) to perform a secondary ordering of the elements in a sequence.

string[] fruits = { "grape", "passionfruit", "banana", "apple", 
                      "orange", "raspberry", "mango", "blueberry" };

// Sort the strings first by their length and then 
// alphabetically by passing the identity selector function.
IEnumerable<string> query =
    fruits.AsQueryable()
    .OrderBy(fruit => fruit.Length).ThenBy(fruit => fruit);

foreach (string fruit in query)
    Console.WriteLine(fruit);

/*
    This code produces the following output:

    apple
    grape
    mango
    banana
    orange
    blueberry
    raspberry
    passionfruit
*/

Dim fruits() As String = _
    {"grape", "passionfruit", "banana", "mango", _
     "orange", "raspberry", "apple", "blueberry"}

' Sort the strings first by their length and then 
' alphabetically by passing the identity selector function.
Dim query = fruits.AsQueryable() _
    .OrderBy(Function(fruit) fruit.Length).ThenBy(Function(fruit) fruit)

' Display the results.
Dim output As New System.Text.StringBuilder
For Each fruit As String In query
    output.AppendLine(fruit)
Next
MsgBox(output.ToString())

'This code produces the following output:

'apple
'grape
'mango
'banana
'orange
'blueberry
'raspberry
'passionfruit

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ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>)は、構築MethodCallExpressionされたThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,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 ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) method generates a MethodCallExpression that represents calling ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) itself as a constructed generic method. MethodCallExpressionに、 IQueryProvider CreateQuery<TElement>(Expression) パラメーターsourceProvider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 source parameter. を呼び出しCreateQuery<TElement>(Expression)た結果が型IOrderedQueryable<T>にキャストされ、が返されます。The result of calling CreateQuery<TElement>(Expression) is cast to type IOrderedQueryable<T> and returned.

呼び出しThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,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、 source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 ThenBy<TSource,TKey>(IOrderedQueryable<TSource>, Expression<Func<TSource,TKey>>) depends on the implementation of the type of the source parameter. 期待される動作は、のsource source各要素に対してを呼び出すkeySelectorことによって取得したキーに基づいて、の要素の2番目の並べ替えを実行することです。The expected behavior is that it performs a secondary sort of the elements of source based on the key obtained by invoking keySelector on each element of source. 以前に確立されたすべての並べ替え順序は保持されます。All previously established sort orders are preserved.

適用対象