Converts the elements in the current List<(Of <(T>)>) to another type, and returns a list containing the converted elements.
(in mscorlib.dll)
Visual Basic (Declaration)
Public Function ConvertAll(Of TOutput) ( _
converter As Converter(Of T, TOutput) _
) As List(Of TOutput)
Dim instance As List
Dim converter As Converter(Of T, TOutput)
Dim returnValue As List(Of TOutput)
returnValue = instance.ConvertAll(converter)
public List<TOutput> ConvertAll<TOutput>(
Converter<T, TOutput> converter
)
public:
generic<typename TOutput>
List<TOutput>^ ConvertAll(
Converter<T, TOutput>^ converter
)
JScript does not support generic types or methods.
Type Parameters
- TOutput
The type of the elements of the target array.
| Exception | Condition |
|---|
| ArgumentNullException |
converter is nullNothingnullptra null reference (Nothing in Visual Basic). |
The Converter<(Of <(TInput, TOutput>)>) is a delegate to a method that converts an object to the target type. The elements of the current List<(Of <(T>)>) are individually passed to the Converter<(Of <(TInput, TOutput>)>) delegate, and the converted elements are saved in the new List<(Of <(T>)>).
The current List<(Of <(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<(Of <(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<(Of <(TOutput>)>) method. The ConvertAll<(Of <(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.
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}
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}
*/
#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}
*/
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0
.NET Compact Framework
Supported in: 3.5, 2.0
XNA Framework
Supported in: 3.0, 2.0, 1.0
Reference