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C# | Performing Specified action on each element of Array

Last Updated : 11 Jul, 2025
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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: 


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