How can I create a lock with Mutex?

Question

I have defined a Mutex in my class (global):

static Mutex fooMutex;

And I want to lock something so that the user is not allowed to see the effect of tapping the image more then once per 3 seconds:

private void Image_Tap_1(...) { bool isRunnng = true; try { Mutex.OpenExisting("foo"); } catch { isRunnng = false; fooMutex = new Mutex(true, "foo"); } if (!isRunnng) { fooFadeIn.Begin(); fooFadeIn.Completed += fooFadeIn_Completed; }

And dispose on Completed:

private void fooFadeIn_Completed(...) { fooMutex.Dispose()

But this does not work, anyone got an idea?

I'm not convinced that a mutex is the best bet here since it may lock up the GUI thread. Maybe you should just disable the image and enable it again in 3 seconds using a timer? — Joachim Isaksson
– Joachim Isaksson, Commented Jan 13, 2013 at 11:20

Kevin Gosse · Accepted Answer · 2013-01-13 11:51:24Z

Rather than using a mutex or a timer, you can just store the time at which the image was last tapped:

private DateTime lastTap; private void Image_Tap_1(...) { var now = DateTime.Now; if ((now - lastTap).TotalSeconds < 3) { return; } lastTap = now; // More than 3 seconds since last tap ... }

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