Does event return anything in .NET

Hi

The event raises, not returns
mostly the event handler's also doesn't return anything. Because the event subscribed by many subscriber then the event supposed to receive multiple values in random order. Even the event can't identify who is return the value. The handling is decoupled through a delegate. So it is useless for the event to receive values and it is discouraged. So the event handler signature comes with the "void".

But you can set your global variables from the event handling code.

Does not return. You can raise an event.

In addition to correct Answer by Albin and in response to partially correct Answer by Abhinav:

Standard event handling requires event arguments to be

delegate EventDelegateType(object sender, EventArgumentType eventArgs);

where EventArgumentType is derived from System.EventArgs; in this case the event itself is to be declared as System.EventHandler (one type is generic with generic type parameter of System.EventArgs or derived) or a base EventHandler.

Only this type will pass the check by FxCop.

In this standard schema, even the event handler cannot return value. Modification of event argument is very important and in certain sense carry "return" functionality, but it is not the return, technically.

What happens if we neglect this standard recommendation and create a custom event type with return value?
It won't be very helpful. The event invocation ignored return values. Why? Just to keep things more simple. In the multi-cast situation (which is usual for event; everyone can add another handler to the same event), there are several different returns. What do to with that? Microsoft decided to ignore them.

Just for events! For delegate instances, anyone can get Delegate.GetInvocationList, get all the return values and do something different. I practice this for certain situations.

--SA

Events don't return anything.
The method that handles the event can return what you want it to.