How to call an event handler from another method

Question

Given the following event handler code:

private void image1_MouseDown(object sender, MouseButtonEventArgs e)
        {
            ///////////
        }

How can I call it from another method:

 private void timerTick(object sender, EventArgs e)
        {
            image1_MouseDown(object,  e); // error

        }

I'm voting to close this question as off-topic because its in Russian — Asons, Sep 27 '19 at 20:28
This might help: https://stackoverflow.com/questions/35696893/how-to-fire-click-event-of-panel-programmatically — Asons, Sep 27 '19 at 20:34
I just provided a translation as well; this question has nothing to do with mouse clicks or timers, and should be closed as duplicate, based on the link in the comment posted by @LGSon — CoolBots, Sep 27 '19 at 20:37
private void timerTick(object sender, EventArgs e) { image1_MouseDown(image1, EventArgs.Empty); } ????? — Эй бой Я playboy, Sep 27 '19 at 20:50
Since the question is put on hold for unclear, here is an answer. Use: `image1_MouseDown(sender, e);` because `object` is a class type, not an instance reference. You can pass any instance you want as `image1` to swap the sender for example, even `null`. — , Sep 28 '19 at 02:37

score 0 · Answer 1 · answered Sep 29 '19 at 17:54

Event handlers are regular methods like any others.

The reason you can't call it like you're trying to do, is because the MouseDown event takes a MouseButtonEventArgs instance, while the Tick event of timers take the base class EventArgs.

You'll need to create a new instance of MouseButtonEventArgs, but then you'll need to initialize it with a device, and other event data.

A better option would be to refactor the body of the MouseDown event handler to a method taking individual parameters, which you can then call without having to create a MouseButtonEventArgs instance.

private void image1_MouseDown(object sender, MouseButtonEventArgs e)
{
    this.ProcessImageMouseDown(e.ChangedButton, e.ButtonState, e.GetPosition(sender as FrameworkElement));
}

private void timerTick(object sender, EventArgs e)
{
    this.ProcessImageMouseDown(MouseButton.Left, MouseButtonState.Pressed, new Point(10d, 20d));
}

private void ProcessImageMouseDown(MouseButton button, MouseButtonState state, System.Windows.Point position)
{
    // Do actual processing here.
}

How to call an event handler from another method

1 Answers1