In Presenter First, why does the SubscribeSomeEvent method on an interface prefer simple old events?

Question

I recently learned about Presenter First and read their bulletins and blogs, etc.

In most of the examples I found, events are not declared directly on the interface, but rather as a method for it. For example,

public interface IPuzzleView
{
    void SubscribeMoveRequest(PointDelegate listener);
    // vs
    event PointDelegate MoveRequest;
}

I don’t understand why. It seemed to me that somewhere I saw a paper / article / blog explaining the reasons for this, but I can no longer find it. The text also contains fragments of unit testing code - I know this because I remember telling myself that one of the unit test was wrong.

UPDATE:

The following is an example of a comparison:

public class Collect
{
    public static CollectAction<T> Argument<T>(int index,
        CollectAction<T>.Collect collectDelegate)
    {
        CollectAction<T> collect = new CollectAction<T>(index, collectDelegate);
        return collect;
    }
}

public interface IApplicationView
{
    event EventHandler Load;

    // or

    void SubscribeLoad(Action action);
}

Mockery mockery = new Mockery();
IApplicationView view = mockery.NewMock<IApplicationView>();
IApplicationModel model = mockery.NewMock<IApplicationModel>();

Subscription Style:

Action savedAction = null;
Expect.Once.On(view).Method("SubscribeLoad").Will(
    Collect.Argument<Action>(0,
    delegate(Action action) { savedAction = action; }));
Expect.Once.On(model).Method("LoadModules");
new ApplicationPresenter(view, model);
savedAction();
mockery.VerifyAllExpectationsHaveBeenMet();

vs. Event:

Expect.Once.On(view).EventAdd("Load", Is.Anything);
Expect.Once.On(model).Method("LoadModules");
new ApplicationPresenter(view, model);
Fire.Event("Load").On(view);
mockery.VerifyAllExpectationsHaveBeenMet();

FYI, , ApplicationPresenter , .

Answer 1

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