WP7 - 如何从堆栈中删除旧页面？

问题描述

嗨专家..在我的申请中有超过20页。 

Hi experts.. In my application there are more than 20 pages. 

我想在导航后销毁或删除页面。

Here i want to destroy or remove the page after navigation.

当用户点击后退按钮时，它应该转到主页面。 

When user click the back button it should go to the Main page. 

我关注MVVM，我的导航代码是： -

I am following MVVM and my navigation code is:-

  groupButton = new ReactiveAsyncCommand();

            var groupBtnResults = groupButton.RegisterAsyncObservable(_ =>
            {
                return HTTPServices.postAndGetResponse((new SearchOperation().Groups()));
            });

            groupBtnResults.Subscribe(
             x =>
             {
                 var rootFrame = (App.Current as App).RootFrame;
                 rootFrame.Navigate(new Uri("/com/views/MyGroupsPage.xaml", UriKind.Relative));
             }
            );

这里如何从页面堆栈中删除页面？我发现这种方法可以销毁页面

Here how to remove the page from Page stack?? I have found this method to destroy the page

NavigationService.RemoveBackEntry();

但我无法使用这在订阅方法中？

But i can not use this in Subscribe method?

请告诉我在哪里必须使用代码删除旧页面？

Please let me know where i have to use the code for remove the old pages??

提前致谢...

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