Retrieving Even-Numbered Events with the .NET Delegate Convention : delegate event « delegate « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. delegate
3. delegate event

using System;
   
public delegate void EvenNumberHandler(object Originator, OnEvenNumberEventArgs EvenNumberEventArgs);
   
class Counter
{
    public event EvenNumberHandler OnEvenNumber;
   
    public Counter()
    {
        OnEvenNumber = null;
    }
   
    public void CountTo100()
    {
        int CurrentNumber;
   
        for(CurrentNumber = 0; CurrentNumber <= 100; CurrentNumber++)
        {
            if(CurrentNumber % 2 == 0)
            {
                if(OnEvenNumber != null)
                {
                    OnEvenNumberEventArgs EventArguments;
   
                    EventArguments = new OnEvenNumberEventArgs(CurrentNumber);
                    OnEvenNumber(this, EventArguments);
                }
            }
        }
    }
}
   
public class OnEvenNumberEventArgs : EventArgs
{
    private int EvenNumber;
   
    public OnEvenNumberEventArgs(int EvenNumber)
    {
        this.EvenNumber = EvenNumber;
    }
   
    public int Number
    {
        get
        {
            return EvenNumber;
        }
    }
}
   
class EvenNumberHandlerClass
{
    public void EvenNumberFound(object Originator, OnEvenNumberEventArgs EvenNumberEventArgs)
    {
        Console.WriteLine(EvenNumberEventArgs.Number);
    }
}
   
class MainClass
{
    public static void Main()
    {
        Counter MyCounter = new Counter();
        EvenNumberHandlerClass MyEvenNumberHandlerClass = new EvenNumberHandlerClass();
        MyCounter.OnEvenNumber += new EvenNumberHandler(MyEvenNumberHandlerClass.EvenNumberFound);
        MyCounter.CountTo100();
    }
}