Array.ConvertAll(Of TInput, TOutput) Method (TInput(), Converter(Of TInput, TOutput))


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()


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.

Type Parameters


The type of the elements of the source array.


The type of the elements of the target array.

Exception Condition

array is null.


converter is null.

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.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.
        For Each p As PointF In apf

        ' 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.
        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
' 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}

.NET Framework
Available since 2.0
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