Handling object events inside collections

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

You need to set the event handler on each Ping instance. Inside the event handler you can inspect the source parameter to identify the Ping object that raised the event. Remember to remove the handler reference once you are finished using the object to help the Garbage Collector do its job.

Answer 2

Please check this link it may help u.

Answer 3

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)