如何获取有关 Frame.GoBack() 上一页的信息 [英] How to get info about previous page on Frame.GoBack()

问题描述

假设我们有一些 Page PageA 和我有一个按钮，当点击它时，会执行以下操作:

Say we have some Page PageA and I have a button that, when clicked, does the following:

Frame.NavigateTo(typeof(PageB));

用户完成某件事后，他从 PageB 导航回到 PageA 调用 Frame.GoBack()

After the user is done doing stuff, he navigates back from PageB to PageA calling Frame.GoBack()

我希望能够确定我是从 PageB 返回

I want be able to determine that I'm navigating back from PageB

我可以使用:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    e.NavigationMode
}

但这只能告诉我我正在返回，而不是从 PageB 返回.

But this only tells me that I'm navigating back, not that I'm navigating back from PageB.

这是否是一个很好的 windows-phone-guidelines 方法(在文档中没有找到这种特殊情况)?

Is this even a good windows-phone-guidelines approach (did not find this particular case in the docs)?

推荐答案

我认为您应该可以使用 Frame.ForwardStack 保存向前导航历史记录的属性.

I think you should be able to do it by using Frame.ForwardStack property which holds forward navigation history.

应该有效的简短示例:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    var lastPage = Frame.ForwardStack.LastOrDefault();
    if (lastPage != null && lastPage.SourcePageType.Equals(typeof(desiredPage)))
        { /* do something */ }
}

这篇关于如何获取有关 Frame.GoBack() 上一页的信息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！