Event parameter; “sender as Object”, or “sender as T”?

Don't be extreme. EventHandler(object sender, EventArgs e) has an object sender so that we can use it in many circumstances. But it doesn't mean a strongly-typed sender is evil.

A strongly-typed sender is useful when this delegate is not going to be widely used(like EventHandler ) e.g.

There is a design guideline that specified that an event-handler should have two params: sender (an Object) and e (EventArgs or derived from that).

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