Page.OnNavigatedTo 不会在 Windows Store 应用程序中调用 [英] Page.OnNavigatedTo doesn't get called in Windows Store app

问题描述

我的应用程序在 Windows 应用商店中一团糟.我添加了一个基本页面，它添加了通用类，例如 LayoutAwarePage.

I have a Windows Store mess around app. I added a Basic Page and it added the Common classes, such as LayoutAwarePage.

但是 Page.OnNavigatedTo 在应用程序启动时不会被调用.MSDN 文档说:

But Page.OnNavigatedTo doesn't get called when an app starts. The MSDN doc says:

当页面被加载并成为一个页面的当前源时调用父框架

Invoked when the Page is loaded and becomes the current source of a parent Frame

在发布期间发生的事情.我在没有调用 LoadState 时发现了这一点.

Which happens during launch. I discovered this when LoadState wasn't being called.

Rick Barraza 在他的演示中使用了 OnNavigatedTo 调用的 LoadState:

Rick Barraza uses LoadState, which is called by OnNavigatedTo, in his demo:

http://channel9.msdn.com/Series/Migrating-apps-from-Windows-Phone-to-Windows-8/Binding-the-Interface-in-Windows-Store-apps#time=2m50s

我知道有些东西坏了，因为现在我添加了一些导航按钮，OnNavigatedFrom 被调用但失败了，因为 _pageKey 为空，因为它不是由 OnNavigatedTo 设置的.

I know something is broken because now that I've added some navigation buttons, the OnNavigatedFrom is called but falls over because _pageKey is null since it wasn't set by OnNavigatedTo.

我实际上很困.这是 Microsoft 原生 Page 类的失败，但显然我是唯一一个遇到此问题且 100% 可发现的人.奇怪.

I actually am pretty stuck. This is a failing in Microsoft's native Page class, but clearly I'm the only person to have this issue and its 100% discoverable. Odd.

更新 1

我添加了一个新的 Grid App 项目，而且效果很好.通用内容作为标准内容全部存在，但它与将基本页面添加到空应用程序时编写的通用内容不同.

I added a new Grid App project and that works. The Common stuff is all there as standard but it does differ from the Common stuff that's written when you add a Basic Page to an empty app.

我将尝试从一个全新的空应用程序中复制此内容.

I will try and repro this from a fresh empty app.

更新 2

好吧，我放弃了.一个新的空白应用程序并添加一个新的空白页面就可以了.我会复制并粘贴我的页面，并假装它从未发生过.

Well, I give up. A new Blank App and adding a new Blank Page is fine. I'll just copy and paste my page over and pretend it never happened.

推荐答案

我遇到了同样的问题，这是由于在我添加的基本页面中存在 OnNavigateTo 的空覆盖.

I had the same problem and it was due to the presence of an empty override of OnNavigateTo in the basic pages I've added.

public sealed partial class MvvmView1
    {
        public MvvmView1()
        {
            this.InitializeComponent();
        }

        /// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.  The Parameter
        /// property is typically used to configure the page.</param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }
    }

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