My 8.1 app crashes when I double tap/click an item in a grid

Question

I've created a small sample project here:

https://github.com/WieserSoftwareLtd/CanDragItemsCrash

It can be crashed by simply double clicking an item.

It's made worse by setting CanDragItems=true, however it also will crash if you click really quickly with it switched off.

On a double click of an item, I create a new shuffled list of numbers and set the collection view source.

It seems wrong that this should crash.

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Anthony Wieser | Wieser Software Ltd | www.wieser-software.com

Answer 1

Try this...

private void Catastrophe(object sender, DoubleTappedRoutedEventArgs e)
        {
            try
            {
                gv.Visibility = Visibility.Collapsed;
                var newItems = items.Shuffle();
                CVS.Source = null;

                CVS.Source = newItems;
                gv.Visibility = Visibility.Visible;
            }
            catch (Exception ex) { }
        }

Answer 2

I'm currently working around it with gv.IsEnabled=false/true which at least doesn't cause a re-layout and flickering like your solution does.

Would you really ship your solution in a product?

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Anthony Wieser | Wieser Software Ltd | www.wieser-software.com

Answer 3

No, I wouldn't. It's a band-aid.

IsEnabled also works. 

I've spent long hours coming up with ways to go around problems like this one.  It's a bug in the system.

Added by edit.

On a different note, why not?  With all the crap that are being published to the winstore with little to no quality control, I don't think anyone would notice.  Those of us who still value quality over quantity are falling behind times.  We now live in the era of just-barely-good-enough.

Answer 4

well, I agree with your final sentiments, that's for sure.  Just barely good enough.  Usually no.

And after all, almost no-one's ever going to run it either based current store uptake.  Hopefully //build has some good news. 

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Anthony Wieser | Wieser Software Ltd | www.wieser-software.com

Answer 5

FWIW, I couldn't get it to crash on Windows 10 build 10061.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 6

That's possibly encouraging Matt. 

How fast is your machine though?  I think it's worse on slower machines

Does it still work in the app simulator?

And when will everyone have W10?! ;)

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Anthony Wieser | Wieser Software Ltd | www.wieser-software.com

Answer 7

Plenty fast.  How slow do you need it to be?  I didn't test on the simulator.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 8

My dev machine is a 2 core T5500 1.67 Ghz machine, 32 bit.  The target machine is a Linx 7 tablet.

Update: Further investigation on the table shows that it only happens with a mouse double click.  I can't seem to break it tapping.

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Anthony Wieser | Wieser Software Ltd | www.wieser-software.com

Answer 9

I'm surprised you guys are delving more into this. I've been observing this behavior since the beginning and just accepted it as normal and found workarounds.