Array.ForEach<T>(T[], Action<T>) Метод

public:
generic <typename T>
 static void ForEach(cli::array <T> ^ array, Action<T> ^ action);

public static void ForEach<T>(T[] array, Action<T> action);

static member ForEach : 'T[] * Action<'T> -> unit

Public Shared Sub ForEach(Of T) (array As T(), action As Action(Of T))

В следующем примере показано, как использовать для ForEach отображения квадратов каждого элемента в массиве целых чисел.

using namespace System;

public ref class SamplesArray
{
public:
    static void Main()
    {
        // create a three element array of integers
        array<int>^ intArray = gcnew array<int> {2, 3, 4};

        // set a delegate for the ShowSquares method
        Action<int>^ action = gcnew Action<int>(ShowSquares);

        Array::ForEach(intArray, action);
    }

private:
    static void ShowSquares(int val)
    {
        Console::WriteLine("{0:d} squared = {1:d}", val, val*val);
    }
};

int main()
{
    SamplesArray::Main();
}

/*
This code produces the following output:

2 squared = 4
3 squared = 9
4 squared = 16
*/

using System;

public class SamplesArray
{
    public static void Main()
    {
        // create a three element array of integers
        int[] intArray = new int[] {2, 3, 4};

        // set a delegate for the ShowSquares method
        Action<int> action = new Action<int>(ShowSquares);

        Array.ForEach(intArray, action);
    }

    private static void ShowSquares(int val)
    {
        Console.WriteLine("{0:d} squared = {1:d}", val, val*val);
    }
}

/*
This code produces the following output:

2 squared = 4
3 squared = 9
4 squared = 16
*/

open System

let showSquares val' =
    printfn $"%i{val'} squared = %i{val' * val'}"

// create a three element array of integers
let intArray = [| 2..4 |]

Array.ForEach(intArray, showSquares)
// Array.iter showSquares intArray

// This code produces the following output:
//     2 squared = 4
//     3 squared = 9
//     4 squared = 16

Public Class SamplesArray
    Public Shared Sub Main()
        ' create a three element array of integers
        Dim intArray() As Integer = New Integer() {2, 3, 4}

        ' set a delegate for the ShowSquares method
        Dim action As New Action(Of Integer)(AddressOf ShowSquares)

        Array.ForEach(intArray, action)
    End Sub

    Private Shared Sub ShowSquares(val As Integer)
        Console.WriteLine("{0:d} squared = {1:d}", val, val*val)
    End Sub
End Class

' This code produces the following output:
'
' 2 squared = 4
' 3 squared = 9
' 4 squared = 16

— Action<T> это делегат метода, который выполняет действие над переданным ему объектом. Элементы по отдельности array передаются в Action<T>.

Этот метод является операцией O(n), где n — из Lengtharray.

В F# можно использовать функцию Array.iter .

• Action<T>