Navigation or new a page in WP8.1 ?

Question

I am having a mainpage.xaml contains a appbar is assigned from a reusable page(ToolboxDeviceSelectionControlPage).

this.BottomAppBar = new ToolboxDeviceSelectionControlPage().BottomAppBar;

After using the ToolboxDeviceSelectionControlPage, I need to return a object to the mainpage. How can I do this?

I tried to use Fram.Navigate(MainPage, object). it crashes and throw: Object reference not set to an instance of an object.

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Jiajun Qiu

Answer 1

What is your actual code?

It sounds like either the page or the object is null. What is the object and did you instantiate it?

The code should be more like this:

this.Frame.Navigate(typeof(MainPage), myObject);

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I'm a self-taught noob amateur. Please take this into account when responding to my posts or when taking advice from me.

Answer 2

Hi JIAJUN.QIU,

Based on your description, I know that you want to pass Object during the navigation, then please try to check the following article which tells the detailed information:
#How to Pass Objects when Navigating between pages in Windows Phone 8.1 Runtime App:
http://mobileosgeek.com/how-to-pass-objects-when-navigating-between-pages-in-windows-phone-8-1-xaml-app/ .

Best Regards,
Amy Peng

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Answer 3

Actually it is not about a navigation.

Since I never navigate away from my mainpage, what I have done is assign a appbar usercontrol to mainpage, as the code I stated, so mainpage is running on a appbar instance created by  

new ToolboxDeviceSelectionControlPage().

 Finally I found out that I can register all event on my mainpage by using FindName to retrieve those controls back in runtime. I dont know if this is a correct way to do it. Feels quite strange though.....

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Jiajun Qiu

Answer 4

Yes it is a correct way.