WP7-没有导航服务的后退按钮

Question

Is it possible to some how capture the Back Button Event without using the Navigation Service?

A previous post here on StackOverflow describes the the Back Button Events (both the overload of OnBackKeyPress and the event handler PhoneApplicationPage_BackKeyPress ) only seem to fire when the navigation service is used.

My implementation is:

//Prepare the page;
NextPage page = new NextPage();

//When we are ready to transition
page.someData = data;
page.parent = this;
this.Content = page;

I'm using this so that I can store the page for use later (essentially so that I can cache it, especially since some of my pages download information from the internet, and so that I can pass it data like above. However, I still need to use the back button to return to the home page.

Is there anyway to trigger the back button while using the above method?

Answer 1

Storing a whole page to cache the data is a bad idea especially in a limited environment like .Net CF.

• it complicates the app (complicated navigation logic, possible cycles)
• app is limited to 90MB of memory

Store the data in IsolatedStorageSettings.ApplicationSettings when dealing with relatively small amount of data eg couple of strings, xml file < 1KB. Otherwise store the data in a file in Isolated Storage eg music, pictures, huge xmls etc.