Creating a new event. : delegate event « delegate « C# / CSharp Tutorial

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

using System;

public class EventTestClass {
    private int nValue;

    public delegate void ValueChangedEventHandler();

    public event ValueChangedEventHandler Changed;

    protected virtual void OnChanged() {
        if (Changed != null)
            Changed();
        else
            Console.WriteLine("Event fired. No handler!");

    }

    public EventTestClass(int nValue) {
        SetValue(nValue);
    }
    public void SetValue(int nV) {
        if (nValue != nV) {
            nValue = nV;
            OnChanged();
        }
    }
}

public class MainClass {
    public static void Main() {
        EventTestClass etc = new EventTestClass(3);
        etc.SetValue(5);
        etc.SetValue(5);
        etc.SetValue(3);
    }
}