Enumerable.ToArray<TSource>(IEnumerable<TSource>) Método

Definición

Espacio de nombres:
System.Linq
Ensamblado:
System.Linq.dll
Ensamblado:
Ensamblado:
System.Core.dll
Ensamblado:
netstandard.dll

Crea una matriz a partir de un IEnumerable<T>.Creates an array from a IEnumerable<T>.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static cli::array <TSource> ^ ToArray(System::Collections::Generic::IEnumerable<TSource> ^ source);
public static TSource[] ToArray<TSource> (this System.Collections.Generic.IEnumerable<TSource> source);
static member ToArray : seq<'Source> -> 'Source[]
<Extension()>
Public Function ToArray(Of TSource) (source As IEnumerable(Of TSource)) As TSource()

Parámetros de tipo

TSource

Tipo de los elementos de source.The type of the elements of source.

Parámetros

source
IEnumerable<TSource>

Objeto IEnumerable<T> a partir del cual se va a crear una matriz.An IEnumerable<T> to create an array from.

Devoluciones

TSource[]

Una matriz que contiene los elementos de la secuencia de entrada.An array that contains the elements from the input sequence.

Excepciones

ArgumentNullException

source es null.source is null.

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar ToArray para forzar la evaluación inmediata de la consulta y devolver una matriz de resultados.The following code example demonstrates how to use ToArray to force immediate query evaluation and return an array of results.

class Package
{
    public string Company { get; set; }
    public double Weight { get; set; }
}

public static void ToArrayEx1()
{
    List<Package> packages =
        new List<Package> 
            { new Package { Company = "Coho Vineyard", Weight = 25.2 },
              new Package { Company = "Lucerne Publishing", Weight = 18.7 },
              new Package { Company = "Wingtip Toys", Weight = 6.0 },
              new Package { Company = "Adventure Works", Weight = 33.8 } };

    string[] companies = packages.Select(pkg => pkg.Company).ToArray();

    foreach (string company in companies)
    {
        Console.WriteLine(company);
    }
}

/*
 This code produces the following output:

 Coho Vineyard
 Lucerne Publishing
 Wingtip Toys
 Adventure Works
*/

Structure Package
    Public Company As String
    Public Weight As Double
End Structure

Sub ToArrayEx1()
    ' Create a list of Package values.
    Dim packages As New List(Of Package)(New Package() _
     {New Package With {.Company = "Coho Vineyard", .Weight = 25.2},
      New Package With {.Company = "Lucerne Publishing", .Weight = 18.7},
      New Package With {.Company = "Wingtip Toys", .Weight = 6.0},
      New Package With {.Company = "Adventure Works", .Weight = 33.8}})

    ' Project the Company values from each item in the list
    ' and put them into an array.
    Dim companies() As String =
    packages _
    .Select(Function(pkg) pkg.Company) _
    .ToArray()

    ' Display the results.
    Dim output As New System.Text.StringBuilder
    For Each company As String In companies
        output.AppendLine(company)
    Next
    Console.WriteLine(output.ToString())
End Sub

' This code produces the following output:
'
' Coho Vineyard
' Lucerne Publishing
' Wingtip Toys
' Adventure Works

Comentarios

El método ToArray<TSource>(IEnumerable<TSource>) fuerza la evaluación de la consulta inmediata y devuelve una matriz que contiene los resultados de la consulta.The ToArray<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns an array that contains the query results. Puede anexar este método a la consulta para obtener una copia en caché de los resultados de la consulta.You can append this method to your query in order to obtain a cached copy of the query results.

ToList tiene un comportamiento similar pero devuelve un List<T> en lugar de una matriz.ToList has similar behavior but returns a List<T> instead of an array.

Se aplica a