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

Definição

Converte os elementos no List<T> atual para outro tipo e retorna uma lista contendo os 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)

Parâmetros de tipo

TOutput

O tipo dos elementos da matriz de destino.The type of the elements of the target array.

Parâmetros

converter
Converter<T,TOutput>

Um delegado Converter<TInput,TOutput> que converte cada elemento de um tipo em outro tipo.A Converter<TInput,TOutput> delegate that converts each element from one type to another type.

Retornos

List<TOutput>

Um List<T> do tipo de destino que contém os elementos convertidos do List<T> atual.A List<T> of the target type containing the converted elements from the current List<T>.

Exceções

Exemplos

O exemplo a seguir define um método PointFToPoint chamado que converte PointF uma estrutura em Point uma estrutura.The following example defines a method named PointFToPoint that converts a PointF structure to a Point structure. Em seguida, o exemplo List<T> cria PointF uma das estruturas, Converter\<PointF, Point> cria umConverter(Of PointF, Point) delegado (em Visual Basic) para PointFToPoint representar o método e passa o delegado para ConvertAll o método.The 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. O ConvertAll método passa cada elemento da lista de entrada para o PointFToPoint método e coloca os elementos convertidos em uma nova lista Point de estruturas.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. Ambas as listas são exibidas.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
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}

Comentários

O Converter<TInput,TOutput> é um delegado a um método que converte um objeto para o tipo de destino.The Converter<TInput,TOutput> is a delegate to a method that converts an object to the target type. Os elementos da atual List<T> são passados individualmente para o Converter<TInput,TOutput> delegado e os elementos convertidos são salvos no novo 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>.

O atual List<T> permanece inalterado.The current List<T> remains unchanged.

Esse método é uma operação O (n), onde n é Count.This method is an O(n) operation, where n is Count.

Aplica-se a

Veja também