# Array.ForEach<T>(T[], Action<T>) 方法

## 定义

``````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))``

T

array
T[]

action
Action<T>

#### 异常

`array``null``array` is `null`.

- 或 --or- `action``null``action` is `null`.

## 示例

``````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
*/

``````
``````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

``````

## 注解

Action<T> 是对传递给它的对象执行操作的方法的委托。The Action<T> is a delegate to a method that performs an action on the object passed to it. `array` 的元素分别传递到 Action<T>中。The elements of `array` are individually passed to the Action<T>.