Array.ConvertAll<TInput,TOutput>(TInput[], Converter<TInput,TOutput>) Method

Definition

將某一個類型的陣列轉換成另一個類型的陣列。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

來源陣列項目的類型。The type of the elements of the source array.

TOutput

目標陣列項目的類型。The type of the elements of the target array.

Parameters

array
TInput[]

要轉換成目標類型之以零為起始的一維 ArrayThe one-dimensional, zero-based Array to convert to a target type.

converter
Converter<TInput,TOutput>

Converter<TInput,TOutput>,可將某一個類型的每一個項目轉換成另一個類型。A Converter<TInput,TOutput> that converts each element from one type to another type.

Returns

TOutput[]

目標類型的陣列,其中包含來源陣列中已轉換的項目。An array of the target type containing the converted elements from the source array.

Exceptions

arraynullarray is null.

-或--or- converternullconverter is null.

Examples

下列程式碼範例會定義名為 PointFToPoint 的方法,將 PointF 結構轉換成 Point 結構。The following code example defines a method named PointFToPoint that converts a PointF structure to a Point structure. 然後,此範例會建立 PointF 結構的陣列、建立 Converter<PointF, Point> 委派(在 Visual Basic 中Converter(Of PointF, Point))來表示 PointFToPoint 方法,並將委派傳遞至 ConvertAll 方法。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. ConvertAll 方法會將輸入清單的每個元素傳遞至 PointFToPoint 方法,並將已轉換的元素放入 Point 結構的新清單中。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. 這兩個清單都會顯示。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}
 */
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

Converter<TInput,TOutput> 是將物件轉換成目標型別之方法的委派。The Converter<TInput,TOutput> is a delegate to a method that converts an object to the target type. array 的元素會個別傳遞至 Converter<TInput,TOutput>,而已轉換的元素會儲存在新的陣列中。The elements of array are individually passed to the Converter<TInput,TOutput>, and the converted elements are saved in the new array.

來源 array 會保持不變。The source array remains unchanged.

這個方法是 O (n)運算,其中 narrayLengthThis method is an O(n) operation, where n is the Length of array.

Applies to

See also