Array.ConvertAll<TInput,TOutput> Method
Definition
Important
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Converts an array of one type to an array of another type.
public:
generic <typename TInput, typename TOutput>
static cli::array <TOutput> ^ ConvertAll(cli::array <TInput> ^ array, Converter<TInput, TOutput> ^ converter);public static TOutput[] ConvertAll<TInput,TOutput> (TInput[] array, Converter<TInput,TOutput> converter);static member ConvertAll : 'Input[] * Converter<'Input, 'Output> -> 'Output[]Public Shared Function ConvertAll(Of TInput, TOutput) (array As TInput(), converter As Converter(Of TInput, TOutput)) As TOutput()Type Parameters
- TInput
The type of the elements of the source array.
- TOutput
The type of the elements of the target array.
Parameters
- array
- TInput[]
The one-dimensional, zero-based Array to convert to a target type.
- converter
- Converter<TInput,TOutput>
A Converter<TInput,TOutput> that converts each element from one type to another type.
Returns
An array of the target type containing the converted elements from the source array.
Exceptions
Examples
The following code example defines a method named PointFToPoint that converts a PointF structure to a Point structure. The example then creates an array 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. 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. In the F# example, the pointFToPoint function is implicitly casted to the Converter<PointF, Point> delegate. 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()
{
// Create an array of PointF objects.
array<PointF>^ apf = {
PointF(27.8F, 32.62F),
PointF(99.3F, 147.273F),
PointF(7.5F, 1412.2F) };
// Display each element in the PointF array.
Console::WriteLine();
for each(PointF p in apf)
{
Console::WriteLine(p);
}
// Convert each PointF element to a Point object.
array<Point>^ ap =
Array::ConvertAll(apf,
gcnew Converter<PointF, Point>(PointFToPoint)
);
// Display each element in the Point array.
Console::WriteLine();
for each(Point p in ap)
{
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()
{
// Create an array of PointF objects.
PointF[] apf = {
new PointF(27.8F, 32.62F),
new PointF(99.3F, 147.273F),
new PointF(7.5F, 1412.2F) };
// Display each element in the PointF array.
Console.WriteLine();
foreach( PointF p in apf )
Console.WriteLine(p);
// Convert each PointF element to a Point object.
Point[] ap = Array.ConvertAll(apf,
new Converter<PointF, Point>(PointFToPoint));
// Display each element in the Point array.
Console.WriteLine();
foreach( Point p in ap )
{
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}
*/
open System
open System.Drawing
open System.Collections.Generic
let pointFToPoint (pf: PointF) =
Point(int pf.X, int pf.Y)
// Create an array of PointF objects.
let apf =
[| PointF(27.8f, 32.62f)
PointF(99.3f, 147.273f)
PointF(7.5f, 1412.2f) |]
// Display each element in the PointF array.
printfn ""
for p in apf do
printfn $"{p}"
// Convert each PointF element to a Point object.
let ap = Array.ConvertAll(apf, pointFToPoint)
// let ap = Array.map pointFToPoint apf
// Display each element in the Point array.
printfn ""
for p in ap do
printfn $"{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}
Imports System.Drawing
Imports System.Collections.Generic
Public Class Example
Public Shared Sub Main()
' Create an array of PointF objects.
Dim apf() As PointF = { _
New PointF(27.8, 32.62), _
New PointF(99.3, 147.273), _
New PointF(7.5, 1412.2) }
' Display each element in the PointF array.
Console.WriteLine()
For Each p As PointF In apf
Console.WriteLine(p)
Next
' Convert each PointF element to a Point object.
Dim ap() As Point = Array.ConvertAll(apf, _
New Converter(Of PointF, Point)(AddressOf PointFToPoint))
' Display each element in the Point array.
Console.WriteLine()
For Each p As Point In ap
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
' The 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}
Remarks
The Converter<TInput,TOutput> is a delegate to a method that converts an object to the target type. The elements of array are individually passed to the Converter<TInput,TOutput>, and the converted elements are saved in the new array.
The source array remains unchanged.
This method is an O(n) operation, where n is the Length of array.
In F#, the Array.map function is generally used instead.
