UWP页面导航标识符

Question

你好在UWP我可以导航到另一个页面,如:

Frame.Navigate(typeof(AnotherPage), someObject);

在AnotherPage如果我想要检索的对象:

protected override void OnNavigationTo(NavigationEventArgs e) {
    SomeObject someObject = (SomeObject) e.Parameter;
    //here I would like to know from what page I am navigating
}

你能告诉我如何从我浏览的页面中找到答案吗？谢谢.

Answer 1

导航完成后,将前一页放在Frame的BackStack上,只需查询该集合即可.

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    SomeObject someObject = (SomeObject)e.Parameter;

    PageStackEntry previousPage = Frame.BackStack.Last();
    Type previousPageType = previousPage?.SourcePageType;

    base.OnNavigatedTo(e);
}