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 应用程序中，我们可以通过这种方式更深入地导航到同一页面:

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));

页面被自动缓存，所以导航回来后，用户离开时在列表中的同一位置.

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，我们通过这种方式更深入地导航到同一页面:

But in Windows Phone Store Apps we navigate deeper to the same page this way:

Frame.Navigate(typeof(SamePage), id);

但是在导航回来后它会再次加载数据，所以如果用户在一个长列表的中间，现在他在顶部:

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;
}

我怎样才能像以前那样缓存页面，以便用户在他离开的列表中处于相同的位置?

(我也包含了 Windows 应用程序，因为他们很早就熟悉它了).

(I included Windows apps too cause they are familiar with it from a longer time).

推荐答案

在你的页面构造器中，你必须指定

In your page constructor you'll have to specify

    public MainPage()
    {
       this.InitializeComponent();
       this.NavigationCacheMode = NavigationCacheMode.Required;
    }

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