Call ALL children methods of a class from another class

Question

Lets say that i have a "Timer" class with a method that every 1 second is called, and it calls another method in the class "Gear":

public class Timer
{
    public void OnTick()
    {
        Gear.Update();
    }
}

public class Gear
{
    public static void Update() { }
}

This kinda works, but it's only called on the base class. The method "Update" should be called in all the childrens of "Gear": e.g:

public class AnotherClass : Gear
{
    public override void Update() { // do stuff }
}
public class YetAnotherClass : Gear
{
    public override void Update() { // do stuff }
}
public class AndAnotherClass : Gear
{
    public override void Update() { // do stuff }
}

How can i do this?

Answer 1

In order for the code to work the way you want, you'd need to do something like this (I would worry about a memory leak):

public abstract class Gear
{
    readonly static List<Gear> gears = new List<Gear>();

    public Gear()
    {
        gears.Add(this);
    }

    public static void Update()
    {
        foreach (var gear in gears)
            gear._Update();
    }

    protected abstract void _Update();
}


public sealed class Gear1 :  Gear
{
    protected override void _Update()
    {
        //do stuff
    }
}

public sealed class Gear2 : Gear
{
    protected override void _Update()
    {
        //do stuff
    }
}

public sealed class Gear3 : Gear
{
    protected override void _Update()
    {
        //do stuff
    }
}


public static void Main(string[] args)
{
    var timer = 
          new Timer(o => Gear.Update(), null, 0, SOME_INTERVAL);                       
}

However, you might be better off by defining the base case thusly:

public abstract class Gear
{
    public abstract void Update();
}

And then define a collection class:

public sealed class GearCollection : List<Gear>
{        
    public void Update()
    {
        foreach (var gear in this)
            gear.Update();
    }
}

And then

public static void Main(string[] args)
{
    var gears = new GearCollection();

    //add gear instancs to gears

    var timer = new Timer(o => gears.Update(), null, 0, SOME_INTERVAL);            
}