Windows phone7 Study Notes 04 -- rewrite the return key

It is unreasonable to roll back to the previous page. For example, if a pop-up box is opened, you may press the return key to close the pop-up box. In this case, their intention is not to leave the application. "return" only means to get rid of the pop-up dialog box. There are two methods for rewriting. The first is to override the onbackkeypress event, and the second is to override the phoneapplicationpage_backkeypress event.

The following code re-writes the return key in Windows Phone

　　1. Rewrite the onbackkeypress event

Protected override void onbackkeypress (system. componentmodel. canceleventargs E)

{

E. Cancel = true;

If (MessageBox. Show ("Save project ?? "," ", Messageboxbutton. okcancel) = messageboxresult. OK)

{

App. intilize ();

Navigationservice. navigate (New uri ("/mainpage. XAML", urikind. relativeorabsolute ));

}

}

2. Rewrite the phoneapplicationpage_backkeypress event.
Add event:

　　

Rewrite:

　　

 

Note that you must not forget to cancel the original return key operation, that is, do not forget E. Cancel = true.