Building a Windows Phone 7 Application–Data Binding and Persistence!

re: Building a Windows Phone 7 Application–Data Binding and Persistence!

.net performance — Mon, 23 Jul 2012 04:43:52 GMT

In this article There is a huge amount of information available on the how’s and why’s of performance testing .NET applications.

www.dapfor.com/.../performance

re: Building a Windows Phone 7 Application–Data Binding and Persistence!

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re: Building a Windows Phone 7 Application–Data Binding and Persistence!

Gagan — Sat, 11 Jun 2011 01:24:29 GMT

I actually just commented that line out and it worked..

re: Building a Windows Phone 7 Application–Data Binding and Persistence!

Rohan — Sun, 22 May 2011 05:40:15 GMT

Hey Nikhil, thanks for the wonderful example. I'm having some trouble with the LoadTimingsFromFile method. The debugger breaks at this line:

inmemlist.Insert(i++, new Timings() { EventName = labelandtiming[0], timingsinms = labelandtiming[1] });

I've checked that labelandtiming is populated correctly, and that inmemlist is getting the values correctly. I can't even catch the exception in spite of the code being in a try-catch block. Thoughts?

re: Building a Windows Phone 7 Application–Data Binding and Persistence!

Amit_Chatterjee' — Fri, 13 May 2011 16:14:11 GMT

Hi Nikhil - thank you for your question.

What exactly do you intend to do with an MVVM pattern for the button? Though the idea looks interesting it might be an overkill for the following reason - there are only 4 buttons on the Bar and few more Menuitems. The MVVM helps when you don’t know the number of items in the collection and it is bound to the view and the view gets notified of the changes in the properties automatically, saving a bit of coding.

Regarding the tombstoing of the applications:

a) Transient Data – Let’s say you start a stopwatch and then you went to some other app then it meant that you did not intend the stopwatch to run. So I don’t save this transient state for sake of simplicity. If needed I could potentially save this as well.

b) Persisted Data – Before the App is tombstoned, we persist the data in the collection to the store and when the App is loaded again we read from the store and populate the collection and the data binding takes care of the rest to display.

i) PhoneApplicationService.Current.Deactivated and PhoneApplicationService.Current.Closed events are handled by saving the collection which is in memory to the store.

ii) As you can see, the method LoadTimingFromFile is called from MainPage() that reads from the file and populates the ObservableCollection.

re: Building a Windows Phone 7 Application–Data Binding and Persistence!

Nikhil — Tue, 03 May 2011 18:19:49 GMT

Nice post! Is there no way to use an MVVM pattern for buttons or menus in the application bar? Also, what did you do to tombstone the application?

Thanks,

Nikhil