C# | Performing Specified action on each element of Array

Last Updated : 06 Oct, 2021

Array.ForEach(T[], Action<T>) Method is used to perform the specified action on each element of the specified array.

Syntax:

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

Parameters:

array: The one-dimensional, zero-based Array on whose elements the action is to be performed.
action: The Action to perform on each element of array.

Exception: This method throws ArgumentNullException array is null or action is null.
Below programs illustrate the use of Array.ForEach(T[], Action) Method:
Example 1:

CSHARP

// C# program to demonstrate
// Array.ForEach(T[], Action<T>)
// Method
using System;
using System.Collections.Generic;
 
class GFG {
 
    // Main Method
    public static void Main()
    {
 
        try {
 
            // Creating and initializing
            // new Array of int
            int[] myArr = { 2, 3, 4, 5 };
 
            // Display the values of the myArr.
            Console.Write("Initial Array: ");
 
            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(myArr);
 
            // set a delegate for
            // the SetSquares method
            Action<int> action = new Action<int>(SetSquares);
 
            // performing the action
            // using ForEach() method
            Array.ForEach(myArr, action);
        }
        catch (ArgumentNullException e) {
 
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
 
    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(int[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {
 
            Console.Write("{0} ", myArr[i]);
        }
        Console.WriteLine();
        Console.WriteLine();
    }
 
    // Defining the method
    // ShowSquares
    private static void SetSquares(int val)
    {
        Console.WriteLine("{0} squared = {1}",
                              val, val * val);
    }
}

Output:

Initial Array: 2 3 4 5 

2 squared = 4
3 squared = 9
4 squared = 16
5 squared = 25

Example 2:

CSHARP

// C# program to demonstrate
// Array.ForEach(T[], Action<T>)
// Method
using System;
using System.Collections.Generic;
 
public class GFG {
 
    // Main Method
    public static void Main()
    {
 
        try {
 
            // Creating and initializing 
            // new Array of with null
            int[] myArr = null;
 
            // set a delegate for
            // the Set Squares method
            Action<int> action = new Action<int>(SetSquares);
 
            // performing the action
            // using ForEach() method
            Console.WriteLine("Trying to perform "
                       +"action on a null Array");
            Console.WriteLine();
            Array.ForEach(myArr, action);
        }
        catch (ArgumentNullException e) {
 
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
 
    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(int[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {
 
            Console.Write("{0} ", myArr[i]);
        }
        Console.WriteLine();
        Console.WriteLine();
    }
 
    // Defining the method
    // ShowSquares
    private static void SetSquares(int val)
    {
        Console.WriteLine("{0} squared = {1}", val, val * val);
    }
}

Output:

Trying to perform action on a null Array

Exception Thrown: System.ArgumentNullException

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.array.foreach?view=netframework-4.7.2

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C# | How to perform a specified action on each element of the List

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