How handle events from a list of business object ?

Question

Hi everyone,

I'm trying handle events from a list of business object.

Actually, i'm wondering if it's possible to write something like that: ObjectsList<>.Changed += new ChangedEventHandler(ListChanged);

to generic subscribe at  all "Changed" event produce by the items attached to the list "ObjectsList".

belows the csharp code where i have tried to implement the concept.

Thx in advance for your help,

Best regards,

Cedric

using System;

using System.Collections.Generic;

using System.Text;

namespace CollectionApplication

{

    // A delegate type for hooking up change notifications.

    public delegate void ChangedEventHandler(object sender, EventArgs e);

    class MyObject

    {

        // An event that clients can use to be notified whenever the elements is changed.

        public event ChangedEventHandler Changed;

        // Invoke the Changed event.

        protected virtual void OnChanged(EventArgs e)

        {

            if (Changed != null)

                Changed(this, e);

        }

        

        public MyObject(int myInt, string myString)

        {

            _myInt = myInt;

            _myString = myString;

            OnChanged(EventArgs.Empty);

        }

        private int _myInt;

        public int MyInt

        {

            get { return _myInt; }

            set { _myInt = value; OnChanged(EventArgs.Empty); }

        }

        private string _myString;

        public string MyString

        {

            get { return _myString; }

            set { _myString = value; OnChanged(EventArgs.Empty); ; }

        }

    }

    class MyCollection

    {

        public List<MyObject> ObjectsList = new List<MyObject>();

        public MyCollection()

        {

            // Add "eventChanged" to the Changed event on "List". 

            // ObjectsList<>.Changed += new ChangedEventHandler(ListChanged);

            ObjectsList.Add(new MyObject(1, "One"));

            ObjectsList.Add(new MyObject(2, "Two"));

            ObjectsList.Add(new MyObject(3, "Three"));

        }

        // This will be called whenever the list changes.

        private void ListChanged(object sender, EventArgs e)

        {

            Console.WriteLine("This is called when the event fires.");

        }

    }

}