How to start a loop upon button click, then stop it upon same button click again

Question

Okay so this is my second time posting here so sorry if this question has already been answered, I couldnt find anything on it.

So basically I have a button, which I want to start a loop when its pressed, I then want the loop to keep repeating until the same button is pressed again, I've been trying to figure this out for a while and I cant seem to get this to work.

So Inside the loop, the program is changing the image inside several picture boxes, I want the program to continue changing the images in a loop until the same button is clicked

Thanks for your help :)

If you need any more information just let me know

EDIT:

    private void btnDance_Click(object sender, EventArgs e)
    {
        bool clicked;
        if (clicked == true)
        {
            timer1.Stop();
        }
        else
        {
            clicked = true;
            timer1.Start();
        }
    }

Could use a `BackgroundWorker` and that would prevent the UI from "freezing" up. — DROP TABLE users, Nov 27 '13 at 17:40
I think the real question is: Why does my application seem to freeze when I start a loop? — Silvermind, Nov 27 '13 at 17:41
You're starting a loop that never terminates itself, and running that loop on the UI thread. This is keeping the UI thread from processing UI related events. — Steve, Nov 27 '13 at 17:43

Michael Gunter · Answer 1 · 2013-11-27T17:46:57.927

2

You probably want to use a Timer. Just drop one of those from your toolbox onto your form, and start/stop it when the button is pressed. Create a handler for the Tick event and perform the image swap within that.

edited Nov 27 '13 at 17:46

answered Nov 27 '13 at 17:40

Michael Gunter

12,528
1
24
58

How would I do this? Sorry I'm new to C# – user2981153 Nov 27 '13 at 17:41
I'd start by looking up `Timer` in MSDN. I'm pretty sure they have some code samples there. – Robert Harvey Nov 27 '13 at 17:42
Ehh.. follow his instructions on how to drag and drop a Timer onto your form? – Marvin Smit Nov 27 '13 at 17:42

score 2 · Accepted Answer · answered Nov 27 '13 at 17:42

Think event-driven... put a timer on your form. In the tick event do your work. Then just have the button toggle whether the timer is active...

    private void timer1_Tick(object sender, EventArgs e)
    {
        // Change your image here
    }

    private void button1_Click(object sender, EventArgs e)
    {
        // Toggle the timer's enabled state
        timer1.Enabled = !timer1.Enabled;
    }

score 0 · Answer 3 · edited May 23 '17 at 10:25

0

There could be various ways:

Implement Pause-Resume pattern using events signals (see this post for example)
Keep a local bool variable (check it in each iteration - break if it is true, and update it once the button is pressed to true).
Or timer (as suggested)

edited May 23 '17 at 10:25

Community

1
1

answered Nov 27 '13 at 17:45

Yosi Dahari

6,794
5
24
44

How to start a loop upon button click, then stop it upon same button click again

3 Answers3

Linked