Queryable.OrderBy Queryable.OrderBy Queryable.OrderBy Queryable.OrderBy Method

Definizione

Ordina gli elementi di una sequenza in ordine crescente.Sorts the elements of a sequence in ascending order.

Overload

OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>)

Ordina gli elementi di una sequenza in ordine crescente usando un operatore di confronto specificato.Sorts the elements of a sequence in ascending order by using a specified comparer.

OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>)

Ordina gli elementi di una sequenza crescente in base a una chiave.Sorts the elements of a sequence in ascending order according to a key.

OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>)

Ordina gli elementi di una sequenza in ordine crescente usando un operatore di confronto specificato.Sorts the elements of 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> ^ OrderBy(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, TKey> ^> ^ keySelector, System::Collections::Generic::IComparer<TKey> ^ comparer);
public static System.Linq.IOrderedQueryable<TSource> OrderBy<TSource,TKey> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector, System.Collections.Generic.IComparer<TKey> comparer);
static member OrderBy : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Key>> * System.Collections.Generic.IComparer<'Key> -> System.Linq.IOrderedQueryable<'Source>
<Extension()>
Public Function OrderBy(Of TSource, TKey) (source As IQueryable(Of TSource), keySelector As Expression(Of Func(Of TSource, TKey)), comparer As IComparer(Of TKey)) As IOrderedQueryable(Of TSource)

Parametri di tipo

TSource

Tipo degli elementi di source.The type of the elements of source.

TKey

Il tipo della chiave restituita dalla funzione rappresentata dal keySelector.The type of the key returned by the function that is represented by keySelector.

Parametri

source
IQueryable<TSource>

Sequenza di valori da ordinare.A sequence of values to order.

keySelector
Expression<Func<TSource,TKey>>

Funzione per estrarre una chiave da un elemento.A function to extract a key from an element.

comparer
IComparer<TKey>

Oggetto IComparer<T> per confrontare le chiavi.An IComparer<T> to compare keys.

Restituisce

Un IOrderedQueryable<T> cui elementi vengono ordinati in base a una chiave.An IOrderedQueryable<T> whose elements are sorted according to a key.

Eccezioni

Il parametro source, il parametro keySelector o il parametro comparer è null.source or keySelector or comparer is null.

Commenti

Questo metodo ha almeno un parametro di tipo Expression<TDelegate> il cui argomento tipo è uno del Func<T,TResult> tipi.This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. Per questi parametri, è possibile passare in un'espressione lambda e verrà compilata per un Expression<TDelegate>.For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Il OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) metodo genera un MethodCallExpression che rappresenta una chiamata OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) stesso come un metodo generico costruito.The OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) method generates a MethodCallExpression that represents calling OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) itself as a constructed generic method. Passa quindi il MethodCallExpression per il CreateQuery<TElement>(Expression) metodo del IQueryProvider rappresentato dal Provider proprietà del source parametro.It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter. Il risultato della chiamata al metodo CreateQuery<TElement>(Expression) viene eseguito il cast al tipo IOrderedQueryable<T> e restituiti.The result of calling CreateQuery<TElement>(Expression) is cast to type IOrderedQueryable<T> and returned.

Il comportamento delle query che si verifica in seguito all'esecuzione di un albero delle espressioni che rappresenta una chiamata OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) dipende dall'implementazione del tipo del source parametro.The query behavior that occurs as a result of executing an expression tree that represents calling OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>, IComparer<TKey>) depends on the implementation of the type of the source parameter. Il comportamento previsto è che ordina gli elementi della source basato sulla chiave ottenuta chiamando keySelector su ogni elemento di source.The expected behavior is that it sorts the elements of source based on the key obtained by invoking keySelector on each element of source. Il comparer parametro viene utilizzato per confrontare le chiavi.The comparer parameter is used to compare keys.

OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>)

Ordina gli elementi di una sequenza crescente in base a una chiave.Sorts the elements of a sequence in ascending order according to a key.

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

Parametri di tipo

TSource

Tipo degli elementi di source.The type of the elements of source.

TKey

Il tipo della chiave restituita dalla funzione rappresentata dal keySelector.The type of the key returned by the function that is represented by keySelector.

Parametri

source
IQueryable<TSource>

Sequenza di valori da ordinare.A sequence of values to order.

keySelector
Expression<Func<TSource,TKey>>

Funzione per estrarre una chiave da un elemento.A function to extract a key from an element.

Restituisce

Un IOrderedQueryable<T> cui elementi vengono ordinati in base a una chiave.An IOrderedQueryable<T> whose elements are sorted according to a key.

Eccezioni

source o keySelector è null.source or keySelector is null.

Esempi

Esempio di codice seguente viene illustrato come utilizzare OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) per ordinare gli elementi di una sequenza.The following code example demonstrates how to use OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) to sort the elements of a sequence.

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

public static void OrderByEx1()
{
    Pet[] pets = { new Pet { Name="Barley", Age=8 },
                   new Pet { Name="Boots", Age=4 },
                   new Pet { Name="Whiskers", Age=1 } };

    // Sort the Pet objects in the array by Pet.Age.
    IEnumerable<Pet> query =
        pets.AsQueryable().OrderBy(pet => pet.Age);

    foreach (Pet pet in query)
        Console.WriteLine("{0} - {1}", pet.Name, pet.Age);
}

/*
    This code produces the following output:

    Whiskers - 1
    Boots - 4
    Barley - 8
*/

Structure Pet
    Public Name As String
    Public Age As Integer
End Structure

Shared Sub OrderByEx1()
    Dim pets() As Pet = {New Pet With {.Name = "Barley", .Age = 8}, _
                         New Pet With {.Name = "Boots", .Age = 4}, _
                         New Pet With {.Name = "Whiskers", .Age = 1}}

    ' Sort the Pet objects in the array by Pet.Age.
    Dim query As IEnumerable(Of Pet) = _
                pets.AsQueryable().OrderBy(Function(pet) pet.Age)

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

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

' This code produces the following output:

' Whiskers - 1
' Boots - 4
' Barley - 8

Commenti

Questo metodo ha almeno un parametro di tipo Expression<TDelegate> il cui argomento tipo è uno del Func<T,TResult> tipi.This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. Per questi parametri, è possibile passare in un'espressione lambda e verrà compilata per un Expression<TDelegate>.For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Il OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) metodo genera un MethodCallExpression che rappresenta una chiamata OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) stesso come un metodo generico costruito.The OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) method generates a MethodCallExpression that represents calling OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) itself as a constructed generic method. Passa quindi il MethodCallExpression per il CreateQuery<TElement>(Expression) metodo del IQueryProvider rappresentato dal Provider proprietà del source parametro.It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter. Il risultato della chiamata al metodo CreateQuery<TElement>(Expression) viene eseguito il cast al tipo IOrderedQueryable<T> e restituiti.The result of calling CreateQuery<TElement>(Expression) is cast to type IOrderedQueryable<T> and returned.

Il comportamento delle query che si verifica in seguito all'esecuzione di un albero delle espressioni che rappresenta una chiamata OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) dipende dall'implementazione del tipo del source parametro.The query behavior that occurs as a result of executing an expression tree that represents calling OrderBy<TSource,TKey>(IQueryable<TSource>, Expression<Func<TSource,TKey>>) depends on the implementation of the type of the source parameter. Il comportamento previsto è che ordina gli elementi della source basato sulla chiave ottenuta chiamando keySelector su ogni elemento di source.The expected behavior is that it sorts the elements of source based on the key obtained by invoking keySelector on each element of source.

Si applica a