Handling global objects and suspension about template10

[JerryNixon]

First, thanks for the question.

Keep your life simple, don't use the Suspension Manager, just persist your view models to file whenever you hit a checkpoint. Is it when the user does something? Is it when you navigate to a new page? Only you can determine the correct checkpoints. You should use the OnNavigatedFrom in your view models to verify that you have saved your state, this is global insofar as the app-level deferral. This does not, however, give you more then the 5 seconds any app is allowed to suspend.

To that end, the checkpoints help your app save more frequently along-the-way so you can be successful when you suspend. Having different view models as properties of another view model is a common practice and there is nothing wrong with that. It's also nice because your view model repository is easily reused because you are not creating something new. Moreover, it doesn't matter if this is a static singleton or not; this approach is universally the same for every app.

Now, to your point. The template could share global objects in a lot of different ways, but I think you would be disappointed how it would be implemented. That's because the way App 1 (not your app) needs to share across is far more complicated than the way your app does, and so you have considerable overhead to use a "generic" solution than that simple implementation you are enjoying right now. What's wrong with creating a GlobalObjects class with a bunch of static properties? Nothing, and its elegance is in its simplicity. Do you need a template for that? No.

That being said, I would be open to a pull request if you wanted to suggest something. But I recommend that unless you already have a universal solution in mind, that you take my advice and enjoy your own solution and let developers simply solve this themselves on a one-off basis. //Jerry

[pekspro]

Thanks for answering :-).

I think you have some really good points (and the code you posted on StackOverflow was starting me thinking).

In my case I have relative small objects so the 5 seconds limit shouldn’t be a problem. So far that a generic solution will be fine. But a generic solution could clearly be misused so I’m not sure if that is an good idea after all .

Either way, I plan to port my app to Windows 10 in a while. Then I will have a deeper look on this.

(Finally, I just want to thank for your videos on MVA – they are excellent :-)

[JerryNixon]

Cheers.

From: pekspro [mailto:[email protected]]
Sent: Thursday, May 28, 2015 11:41 PM
To: Windows-XAML/Template10
Cc: Jerry Nixon
Subject: Re: [Template10] Handling global objects and suspension (#1)

Thanks for answering :-).

I think you have some really good points (and the code you posted on StackOverflow was starting me thinking).

In my case I have relative small objects so the 5 seconds limit shouldn’t be a problem. So far that a generic solution will be fine. But a generic solution could clearly be misused so I’m not sure if that is an good idea after all J.

Either way, I plan to port my app to Windows 10 in a while. Then I will have a deeper look on this.

(Finally, I just thank for your videos on MVA – they are excellent :-)

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