C#•2y ago

❔ Events vs Tasks

In what situation would you use an Event over a Task that might wrap the event? As an example:

    private Component dragItem;

    public void OnMousePressed(EventArgs e)
    {
        dragItem = getItem(e.Position);
    }
    
    public void OnMouseReleased(EventArgs e)
    {
        dragItem.Position = e.Position;
    }

    private Component dragItem;

    public void OnMousePressed(EventArgs e)
    {
        dragItem = getItem(e.Position);
    }
    
    public void OnMouseReleased(EventArgs e)
    {
        dragItem.Position = e.Position;
    }

    public async void OnMousePressed(EventArgs e)
    {
        var dragItem = getItem(e.Position);
        var released = await MouseReleasedEvent();
        dragItem.Position = released.Position;
    }

    public async void OnMousePressed(EventArgs e)
    {
        var dragItem = getItem(e.Position);
        var released = await MouseReleasedEvent();
        dragItem.Position = released.Position;
    }

The second implementation is (obviously, to me) cleaner and easier to understand, all the logic together and with its vars staying in scope, for the situations where a process relies on multiple events.
Are there any memory or performance concerns with doing it that way? Or other good reasons to not do that (Assuming I am just wrapping a basic Event with a TaskCompletionSource that's handled somewhere else) (And assuming I'm using async Events correctly, which I haven't really looked into how to do them without async voiding but I assume it's possible...)

4 Replies

Anton•2y ago

tasks are essentially one time event handlers good for stateful workflows for housekeeping, like e.g. counters in a game, events work better wrapping an event in a task is a good idea the other direction feels weird to me performance? I don't think so really a task completion source is just a tad bit more housekeeping

D.Mentia•2y ago

The question is mostly about defining those two different situations, when events are appropriate over tasks. Because... why not make both, use whichever one makes the most sense

Anton•2y ago

yeah, make both, sure as long as it helps simplify your logic, make both .

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Events vs Tasks