转到C＃WPF中的第一页

Question

I am using navigation services in WPF. For navigating to page I use:

this.NavigationService.Navigate(new MyPage());

For going back I use:

this.NavigationService.GoBack();

But how do I go back to the first page (Home button) without using

this.NavigationService.Navigate(new FirstScreen());

Because I do not wish to create new first page, just go back to it? And I don't always open new screens in the same order.

Answer 1

One way could be to use method RemoveBackEntry until there is only a single entry left in the back stack of navigation service. Once there is only a single entry simple do Navigation.GoBack()

Answer 2

Here's a potential solution, however there may be a 'best practice' method that i'm not currently aware of:

while(this.NavigationService.CanGoBack)
{
   this.NavigationService.GoBack();
}

CanGoBack returns true if there are entries in the back navigation history and as such GoBack() will be executed until it returns false. In theory this should get you back to the origin, or in other words the first page.

Answer 3

Consider implementing PageFunction<T> . This class (derived from Page ) is designed for scenarios when you want to unwind to a 'start' page. It can return/provide an object of type T as a result upon 'completion' of the use case (function).

More detail (better than msdn) can be found here http://paulstovell.com/blog/wpf-navigation