Question

How to write your own method that accepts a callback in C#

Answer 1

using System;

public class CallbackMethod 
{
    // This method receives:
    // 1. an int array
    // 2. a callback function (Action<int>) that will be applied to each element
    public static void ApplyToArray(int[] arr, Action<int> callback) {
        foreach (var item in arr)
            callback(item);   // Execute the callback on each array element
    }

    public static void Main(string[] args)
    {
        int[] arr = { 5, 10, 15, 30 };

        // Call ApplyToArray and pass a lambda callback:
        // For each element x, print x / 5
        ApplyToArray(arr, x => Console.WriteLine(x / 5));
        
        Array.ForEach(arr, n => Console.Write(n + " "));
    }
}


/*
run:

1
2
3
6
5 10 15 30 

*/

 

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