Events and delegates

EventsDelegates.cs

    public class SampleEventArgs
    {
        public SampleEventArgs(string s) { Text = s; }
        public String Text { get; private set; } // readonly
    }
    public class Publisher
    {
        //Sample delegate
        public delegate void SampleEventHandler(object sender, SampleEventArgs e);
        //GenericDelegate
        public delegate T GenericEventHandler<T>();

        public event Func<bool> SampleEventWithReturnValue;

        public event SampleEventHandler SampleEvent;

        public virtual void RaiseSampleEvent()
        {
            if (SampleEvent != null)
                SampleEvent(this, new SampleEventArgs("Hello"));
        }

        //When multiple handlers are associated with a single event in C# and the handler signature has a return type, 
        //then the value returned by the last handler executed will be the one returned to the event raiser.
        public virtual bool RaiseSampleEventWithReturnValue()
        {
            return SampleEventWithReturnValue();
        }
    }
    
    class Program
    {


        public static void Main()
        {

            var zz = new Publisher();
            zz.SampleEvent += (object sender, SampleEventArgs e) => { Console.WriteLine(e.Text); };
            zz.RaiseSampleEvent();
            //Output: Hello

            zz.SampleEventWithReturnValue += () => { return true; };
            zz.SampleEventWithReturnValue += () => { return true; };
            zz.SampleEventWithReturnValue += () => { return false; };

            Console.WriteLine(zz.RaiseSampleEventWithReturnValue());
            //Output: False

            Console.ReadLine();
        }

    }