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List<T>::ConvertAll<TOutput> Method

Converts the elements in the current List<T> to another type, and returns a list containing the converted elements.

Namespace:  System.Collections.Generic
Assembly:  mscorlib (in mscorlib.dll)

generic<typename TOutput>
List<TOutput>^ ConvertAll(
	Converter<T, TOutput>^ converter

Type Parameters


The type of the elements of the target array.


Type: System::Converter<T, TOutput>
A Converter<TInput, TOutput> delegate that converts each element from one type to another type.

Return Value

Type: System.Collections.Generic::List<TOutput>
A List<T> of the target type containing the converted elements from the current List<T>.


converter is nullptr.

The Converter<TInput, TOutput> is a delegate to a method that converts an object to the target type. 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>.

The current List<T> remains unchanged.

This method is an O(n) operation, where n is Count.

The following code example defines a method named PointFToPoint that converts a PointF structure to a Point structure. 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<TOutput> method. The ConvertAll<TOutput> method passes each element of the input list to the PointFToPoint method and puts the converted elements into a new list of Point structures. 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));

    for each(PointF p in lpf)

    List<Point>^ lp = 
            gcnew Converter<PointF, Point>(PointFToPoint)

    for each(Point p in lp)

/* 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}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.