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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)

Public Shared Function ConvertAll(Of TInput, TOutput) ( _
	array As TInput(), _
	converter As Converter(Of TInput, TOutput) _
) As TOutput()
Dim array As TInput()
Dim converter As Converter(Of TInput, TOutput)
Dim returnValue As TOutput()

returnValue = Array.ConvertAll(array, _

Type Parameters


The type of the elements of the source array.


The type of the elements of the target array.


Type: TInput()

The one-dimensional, zero-based Array to convert to a target type.

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.


array is Nothing.


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)  }

        For Each p As PointF In apf

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

        For Each p As Point In ap

    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} 


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

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