events are not heritable, are they?

[pschulz]

There is literature saying events are not heritable.
I made an code example, seems to me events a r e heritabel.

Maybe its something not really clear within oop world?
The example has 3 classes: cycel, bicycle, motorcycle and InvalidWhightEventArgs.

Cycel is the base, and there is declared the event InvalidWightEventHandler, occures if whight gets an invalid value.

The property whight is overwritten in the other classes, with intention. Cause the literature says futhermore, events rise only in those classes where they are declared.
So, the event in this example is only declared in cycle, but raises in all the others as well.

The code, Class Cycle:

public delegate void InvalidWightEventHandler(Cycle sender);

    public class Cycle
    {
        protected double mWight = 0;
      
        public event InvalidWightEventHandler InvalidWight;

        //Constructor
        public Cycle() { }

        //OnXx Methods
        protected virtual void OnInvalidWight(InvalidWhightEventArgs e)
        {
            if (InvalidWight != null)
                InvalidWight(this);
        }
        //Propertys
        public virtual double Wight
        {
            get
            {return mWight;}
            set
            {
                if (value >= 0)
                   {mWight = value;}
                else
                {
                    OnInvalidWight(new InvalidWhightEventArgs(value));
                }
            }
        }

        public override string ToString()
        {
            return "Cycle=" + "Cycle\n" + ", Wight=" + Wight;
        }
    }

Class BiCycle

 public class BiCycle : Cycle
    {
        //Constructor
        public BiCycle() { }

        //Propertys
        public override double Wight
        {
            get
            {
                return mWight;
            }
            set
            {
                //other conditions
                if (value >= 10)
                {
                    mWight = value;
                }
                else
                {
                    OnInvalidWight(new InvalidWhightEventArgs(value));
                }
            }
        }
        public override string ToString()
        {
            return "Cycle=" + "BiCyle\n" + ", Wight=" + Wight;
        }
    }

Class MotorCycle

public class MotorCycle: BiCycle
    {
        //Constructor
        public MotorCycle() { }      

        //Propertys
        public override  double Wight
        {
            get
            {return mWight;}
            set
            {
                //MotorCycle other conditions
                if (value >= 100)
                   {mWight = value; }
                else
                { 
                    OnInvalidWight(new InvalidWhightEventArgs(value));
                }
            }
        }
        public override string ToString()
        {
            return "Cycle=" + "MotorCyle\n" + ", Wight=" + Wight;
        }
    }

Class InvalidWhightEventArgs

 public class InvalidWhightEventArgs : EventArgs
    {
        // Fields
        private double mInvalidWhight;

        //Constructor
        public InvalidWhightEventArgs(double invalidWhight)
        {
            mInvalidWhight = invalidWhight;
        }

        //Propertys
        public double InvalidWhight
        {
            get { return mInvalidWhight; }
        }
    }

Class Programm

 class Program
    {
        static void Main(string[] args)
        {
            Cycle myC = new Cycle();
            BiCycle myB = new BiCycle();
            MotorCycle myM = new MotorCycle();

            myC.InvalidWight += myB_InvalidWight;
            myB.InvalidWight += myB_InvalidWight;
            myM.InvalidWight += myB_InvalidWight;

            myC.Wight = -1;
            myB.Wight = 1;
            myM.Wight = 10;

            Console.ReadLine();  
        }

        private static void myB_InvalidWight(object sender)
        {           
            Console.WriteLine("invalid wight: " + ((Object)sender).ToString());                     
        }
    }