Question

How do I properly handle the events of objects inside a collection?

Example: I have a List<Ping> which asynchronously pings a number of servers. How can I tell if one of the items in the List have called the PingCompleted event? What if I add/remove Ping objects?

Answer 1

Collection is rather better than List for inheritance:

class PingCollection : Collection<Ping>
{
    protected override void InsertItem(int index, Ping item)
    {
        ping.PingCompleted += PingCompleted

        base.InsertItem(index, item);
    }

    private void PingCompleted(object sender, EventArgs e)
    {
        // do stuff
    }
}

And don’t forget to unsubscribe on remove.

(Edited to lead Dan’s suggestion)