如何在Windows Phone 8.1中缓存页面 [英] How to cache a page in Windows Phone 8.1
问题描述
以前,在 Windows Phone 8.0
应用中,我们可以通过以下方式更深地浏览到同一页面:
Previously in Windows Phone 8.0
apps, we could navigate deeper to the same page this way:
NavigationService.Navigate(new Uri("/SamePage.xaml", UriKind.Relative));
页面是自动缓存的,因此在导航后,用户离开时位于列表上的同一位置.
Page was cached automatically, so after navigating back, user was on the same position on the list when he left.
但是在 Windows Phone Store Apps
中,我们通过以下方式更深地浏览到同一页面:
But in Windows Phone Store Apps
we navigate deeper to the same page this way:
Frame.Navigate(typeof(SamePage), id);
但是在向后浏览后,它会再次加载数据,因此,如果用户位于一长串列表的中间,那么他现在位于顶部:
But after navigating back it loads data again so if user was on the middle of a long list, now he is on the top:
private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
// TODO: Create an appropriate data model for your problem domain to replace the sample data.
var group = await SampleDataSource.GetGroupAsync((string)e.NavigationParameter);
this.DefaultViewModel["Group"] = group;
}
我如何像以前一样缓存页面,使用户在列表上位于他离开的位置的同一位置?
(我之所以加入Windows应用程序,是因为他们从长期以来对它也很熟悉).
(I included Windows apps too cause they are familiar with it from a longer time).
推荐答案
在页面构造函数中,您必须指定
In your page constructor you'll have to specify
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
}
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