List<T>.ConvertAll(Converter<T,TOutput>) List<T>.ConvertAll(Converter<T,TOutput>) List<T>.ConvertAll(Converter<T,TOutput>) List<T>.ConvertAll(Converter<T,TOutput>) Method

Definición

Convierte en otro tipo los elementos incluidos en la List<T> actual y devuelve una lista que contiene los elementos convertidos.Converts the elements in the current List<T> to another type, and returns a list containing the converted elements.

public:
generic <typename TOutput>
 System::Collections::Generic::List<TOutput> ^ ConvertAll(Converter<T, TOutput> ^ converter);
public System.Collections.Generic.List<TOutput> ConvertAll<TOutput> (Converter<T,TOutput> converter);
member this.ConvertAll : Converter<'T, 'Output> -> System.Collections.Generic.List<'Output>
Public Function ConvertAll(Of TOutput) (converter As Converter(Of T, TOutput)) As List(Of TOutput)

Parámetros de tipo

TOutput

Tipo de los elementos de la matriz de destino.The type of the elements of the target array.

Parámetros

converter
Converter<T,TOutput>

Delegado Converter<TInput,TOutput> que convierte cada elemento de un tipo en otro tipo.A Converter<TInput,TOutput> delegate that converts each element from one type to another type.

Devoluciones

List<TOutput>

List<T> del tipo de destino que contiene los elementos convertidos de la List<T> actual.A List<T> of the target type containing the converted elements from the current List<T>.

Excepciones

Ejemplos

En el ejemplo siguiente se define un PointFToPoint método denominado que convierte PointF una estructura en Point una estructura.The following example defines a method named PointFToPoint that converts a PointF structure to a Point structure. A continuación, en el List<T> ejemplo PointF Converter\<PointF, Point> Converter(Of PointF, Point) secreaPointFToPoint un de estructuras, se crea un delegado (en Visual Basic) para representar el método y se pasa el delegado al método.ConvertAllThe example then creates a List<T> of PointF structures, creates a Converter\<PointF, Point> delegate (Converter(Of PointF, Point) in Visual Basic) to represent the PointFToPoint method, and passes the delegate to the ConvertAll method. El ConvertAll método pasa cada elemento de la lista de entrada PointFToPoint al método y coloca los elementos convertidos en una nueva lista Point de estructuras.The ConvertAll method passes each element of the input list to the PointFToPoint method and puts the converted elements into a new list of Point structures. Se muestran ambas listas.Both lists are displayed.

#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Collections::Generic;

Point PointFToPoint(PointF pf)
{
    return Point((int) pf.X, (int) pf.Y);
};

void main()
{
    List<PointF>^ lpf = gcnew List<PointF>();

    lpf->Add(PointF(27.8F, 32.62F));
    lpf->Add(PointF(99.3F, 147.273F));
    lpf->Add(PointF(7.5F, 1412.2F));

    Console::WriteLine();
    for each(PointF p in lpf)
    {
        Console::WriteLine(p);
    }

    List<Point>^ lp = 
        lpf->ConvertAll<Point>(
            gcnew Converter<PointF, Point>(PointFToPoint)
        );

    Console::WriteLine();
    for each(Point p in lp)
    {
        Console::WriteLine(p);
    }
}

/* This code example produces the following output:

{X=27.8, Y=32.62}
{X=99.3, Y=147.273}
{X=7.5, Y=1412.2}

{X=27,Y=32}
{X=99,Y=147}
{X=7,Y=1412}
 */
using System;
using System.Drawing;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<PointF> lpf = new List<PointF>();

        lpf.Add(new PointF(27.8F, 32.62F));
        lpf.Add(new PointF(99.3F, 147.273F));
        lpf.Add(new PointF(7.5F, 1412.2F));

        Console.WriteLine();
        foreach( PointF p in lpf )
        {
            Console.WriteLine(p);
        }

        List<Point> lp = lpf.ConvertAll( 
            new Converter<PointF, Point>(PointFToPoint));

        Console.WriteLine();
        foreach( Point p in lp )
        {
            Console.WriteLine(p);
        }
    }

    public static Point PointFToPoint(PointF pf)
    {
        return new Point(((int) pf.X), ((int) pf.Y));
    }
}

/* This code example produces the following output:

{X=27.8, Y=32.62}
{X=99.3, Y=147.273}
{X=7.5, Y=1412.2}

{X=27,Y=32}
{X=99,Y=147}
{X=7,Y=1412}
 */
Imports System.Drawing
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main()

        Dim lpf As New List(Of PointF)

        lpf.Add(New PointF(27.8, 32.62))
        lpf.Add(New PointF(99.3, 147.273))
        lpf.Add(New PointF(7.5, 1412.2))

        Console.WriteLine()
        For Each p As PointF In lpf
            Console.WriteLine(p)
        Next

        Dim lp As List(Of Point) = lpf.ConvertAll( _
            New Converter(Of PointF, Point)(AddressOf PointFToPoint))

        Console.WriteLine()
        For Each p As Point In lp
            Console.WriteLine(p)
        Next

    End Sub

    Public Shared Function PointFToPoint(ByVal pf As PointF) _
        As Point

        Return New Point(CInt(pf.X), CInt(pf.Y))
    End Function
End Class

' This code example produces the following output:
'
'{X=27.8, Y=32.62}
'{X=99.3, Y=147.273}
'{X=7.5, Y=1412.2}
'
'{X=28,Y=33}
'{X=99,Y=147}
'{X=8,Y=1412}

Comentarios

Converter<TInput,TOutput> Es un delegado de un método que convierte un objeto al tipo de destino.The Converter<TInput,TOutput> is a delegate to a method that converts an object to the target type. Los elementos del actual List<T> se pasan individualmente Converter<TInput,TOutput> al delegado y los elementos convertidos se guardan en el nuevo List<T>.The elements of the current List<T> are individually passed to the Converter<TInput,TOutput> delegate, and the converted elements are saved in the new List<T>.

El actual List<T> permanece sin cambios.The current List<T> remains unchanged.

Este método es una operación O (n), donde n es Count.This method is an O(n) operation, where n is Count.

Se aplica a

Consulte también: