Enumerable.ToList<TSource>(IEnumerable<TSource>) Método
Definición
Crea un List<T> a partir de un IEnumerable<T>.Creates a List<T> from an IEnumerable<T>.
public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static System::Collections::Generic::List<TSource> ^ ToList(System::Collections::Generic::IEnumerable<TSource> ^ source);
public static System.Collections.Generic.List<TSource> ToList<TSource> (this System.Collections.Generic.IEnumerable<TSource> source);
static member ToList : seq<'Source> -> System.Collections.Generic.List<'Source>
<Extension()>
Public Function ToList(Of TSource) (source As IEnumerable(Of TSource)) As List(Of TSource)
Parámetros de tipo
- TSource
Tipo de los elementos de source
.The type of the elements of source
.
Parámetros
- source
- IEnumerable<TSource>
IEnumerable<T> a partir del cual se va a crear List<T>.The IEnumerable<T> to create a List<T> from.
Devoluciones
- List<TSource>
List<T> que contiene los elementos de la secuencia de entrada.A List<T> that contains elements from the input sequence.
Excepciones
source
es null
.source
is null
.
Ejemplos
En el ejemplo de código siguiente se muestra cómo utilizar ToList para forzar la evaluación inmediata de la consulta y devolver un valor de List<T> que contiene los resultados de la consulta.The following code example demonstrates how to use ToList to force immediate query evaluation and return a List<T> that contains the query results.
string[] fruits = { "apple", "passionfruit", "banana", "mango",
"orange", "blueberry", "grape", "strawberry" };
List<int> lengths = fruits.Select(fruit => fruit.Length).ToList();
foreach (int length in lengths)
{
Console.WriteLine(length);
}
/*
This code produces the following output:
5
12
6
5
6
9
5
10
*/
' Create an array of strings.
Dim fruits() As String =
{"apple", "passionfruit", "banana", "mango",
"orange", "blueberry", "grape", "strawberry"}
' Project the length of each string and
' put the length values into a List object.
Dim lengths As List(Of Integer) =
fruits _
.Select(Function(fruit) fruit.Length) _
.ToList()
' Display the results.
Dim output As New System.Text.StringBuilder
For Each length As Integer In lengths
output.AppendLine(length)
Next
Console.WriteLine(output.ToString())
' This code produces the following output:
'
' 5
' 12
' 6
' 5
' 6
' 9
' 5
' 10
Comentarios
El ToList<TSource>(IEnumerable<TSource>) método fuerza la evaluación inmediata de la consulta y devuelve un List<T> que contiene los resultados de la consulta.The ToList<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns a List<T> 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.
ToArray tiene un comportamiento similar, pero devuelve una matriz en lugar de una List<T> .ToArray has similar behavior but returns an array instead of a List<T>.