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Array.ConvertAll(Of TInput, TOutput) Method

Converts an array of one type to an array of another type.

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

'Declaration
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
Type: TInput()
The one-dimensional, zero-based Array to convert to a target type.
converter
Type: System.Converter(Of TInput, TOutput)
A Converter(Of TInput, TOutput) that converts each element from one type to another type.

Return Value

Type: TOutput()
An array of the target type containing the converted elements from the source array.

ExceptionCondition
ArgumentNullException

array is Nothing.

-or-

converter is Nothing.

The Converter(Of 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(Of 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.

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(Of TInput, TOutput) method. The ConvertAll(Of TInput, 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 apf() As PointF = { _
            New PointF(27.8, 32.62), _
            New PointF(99.3, 147.273), _
            New PointF(7.5, 1412.2)  }

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

        Dim ap() As Point = Array.ConvertAll(apf, _
            New Converter(Of PointF, Point)(AddressOf PointFToPoint))

        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

' 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}


.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.
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