using System;
using System.Reflection;
 
public delegate void ProgramMethodDelegate();
public delegate void DelegateMethod();
 
public class Test
{
	public static void Main()
	{
		BaseClass bc = new BaseClass();
		Console.WriteLine("EventInfo");
		EventInfo eInfo =  bc.GetType().GetEvent("FieldChanged");
		//Console.WriteLine(eInfo.AddMethod.Name);
		// add_FieldChanged
		//Console.WriteLine(eInfo.RemoveMethod.Name);
		// remove_FieldChanged
		Console.WriteLine(eInfo.DeclaringType);
		// BaseClass
		Console.WriteLine(eInfo.EventHandlerType);
		// DelegateMethod
		Console.WriteLine(eInfo.IsMulticast);
		// True
		Console.WriteLine(eInfo.IsSpecialName);
		// False
		Console.WriteLine(eInfo.MemberType);
		// Event
		Console.WriteLine(eInfo.MetadataToken);
		// 335544322
		//Console.WriteLine(eInfo.RaiseMethod);
		//NULL : This is because the C# and Visual Basic compilers do not generate such a method by default.
		Console.WriteLine(eInfo.ReflectedType);
		// BaseClass
		//Console.WriteLine("Other methods:" + eInfo.GetOtherMethods().Length);
		// 0
		ProgramMethodDelegate pdelg = new ProgramMethodDelegate(delegate { Console.WriteLine("new delegate"); });
		DelegateMethod delg = new DelegateMethod(pdelg);
		eInfo.AddEventHandler(bc, delg);
		bc.OnChanged();
		// Field value was changed to Hello from BaseClass!!
		// Method 1 was invoked in BaseClass
		// new delegate
 
	}
}
 
public class BaseClass
{
    public event DelegateMethod fieldChanged;
    public event DelegateMethod FieldChanged
    {
        add { 
            fieldChanged += value;
        }
        remove
        {
                fieldChanged -= value;               
        }
    }
 
    public string Field
	{
		get;
		protected set;
	}
 
	public BaseClass()
	{
		Field = "!@$$";
		SayHello();
	}
 
	public virtual void SayHello()
	{
		Console.WriteLine("Hello from BaseClass!");
		Field = "Hello from BaseClass!";
		FieldChanged += delegate { Console.WriteLine("Field value was changed to " + Field + "!"); };
		FieldChanged += Method1;
		//FieldChanged -= Method1;
	}
 
	protected void Method1()
	{
		Console.WriteLine("Method 1 was invoked in BaseClass");
	}
 
	public void OnChanged()
	{
		fieldChanged();       
	}
}