Call Back in windows phone 7

I nee开发者_StackOverflow中文版d to call the back button command at some point in my application programmatically, so what is the command for that.

The issue is that i need the application to exit when the user presses back from the second page, hence i need to call the back button command when navigated on to the first page to exit.

I searched online and found out that there is no systematic way to exit an application in code so any suggestion?

Thanks,

Call NavigationService.RemoveBackEntry(); in OnNavigatedTo of the second page. This will remove the first page from the navigation stack and if the user presses the back key the application will exit.

Warning: Call remove only once! (multitasking calls OnNavigatedTo multiple times)

private bool removed = false;
public override void OnNavigatedTo(...)
{
    if (!removed) 
    {
        removed = true; 
        NavigationService.RemoveBackEntry();
    }

(WP 7.1 [Mango] only)

I found that this worked for me using Windows Phone SDK 7.1 (mango):

private bool removeBack = true;

private void PhoneApplicationPage_BackKeyPress ( object sender , System . ComponentModel . CancelEventArgs e )
{
    if ( removeBack )
    {
        this . removeBack = false;

        if ( NavigationService . CanGoBack )
        {
            this . NavigationService . RemoveBackEntry ( );
        }
    }
}

NavigationService.GoBack();

This can be called on a Page to go back again - if this is the first page your app will exit, you can't force an exit from an application - in 7.1 there are methods to remove pages from the Navigation "backstack" that can skip a page to achieve a similar effect such as:

NavigationService.RemoveBackEntry();

However that does only work on "Mango" SDK and devices/emulator

Sorry this solution doesn't work have checked this, but am leaving this here incase it is useful to someone.