在 Windows Phone 8 中更改 UriMapper 后重定向页面 [英] Redirect page after changing UriMapper in Windows Phone 8

问题描述

我有一个应用程序，当 RootFrame 首次初始化时，我让它检查该应用程序是否是第一次启动.如果是，它会将 RootFrame UriMapper 更改为教程页面.问题是，我似乎无法找到将用户重定向回 MainPage.xaml 的方法.到目前为止它不会做任何事情.

I have an app, and when the RootFrame is first initialized, I have it checking if its the first time the app has been launched. If it is, it changes the RootFrame UriMapper to a tutorial page. the problem is, I can't seem to figure out a way to redirect the user back to MainPage.xaml. It just won't do anything so far.

这是我用于更改 App 构造函数中初始启动页面的代码:

This is the code I'm using for changing the initial start up page in the App constructor:

if (App.Model.SelectFirstStart())
{
    var mapper = new UriMapper();

    mapper.UriMappings.Add(new UriMapping
    {
       Uri = new Uri("/MainPage.xaml", UriKind.Relative),
       MappedUri = new Uri("/TutorialPage.xaml", UriKind.Relative)
       });

       RootFrame.UriMapper = mapper;
    }

当用户点击教程页面中的按钮时，它应该将它们重定向到 MainPage.xaml.这是我迄今为止尝试过的:

When the user taps a button in the tutorial page, it should redirect them to the MainPage.xaml. This is what I've tried so far:

NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));

还有:

App.RootFrame.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));

任何帮助将不胜感激.谢谢

Any help would be much appreciated. Thank you

推荐答案

我看到了几个问题.

首先，您没有更改教程页面中的映射，因此基本上 MainPage.xaml 仍然映射到 TutorialPage.xaml.

First, you are not changing the mapping in your tutorial page so basically MainPage.xaml still maps to TutorialPage.xaml.

第二个问题是即使在修复之后，导航到 MainPage.xaml 仍然无法工作，因为尽管实际页面是 TutorialPage.xaml, RootFrame.CurrentSource 仍然会指向 MainPage.xaml .

Second issue is even after fixing that, navigation to MainPage.xaml will still not work because despite the actual page being TutorialPage.xaml, RootFrame.CurrentSource will still point to MainPage.xaml no matter what.

要解决此问题，您需要在教程页面的按钮单击中执行以下操作

To fix this you need to do the following in your tutorial page's button click

// Inside the Button click event of TutorialPage.xaml
// Change the mapping so that MainPage points to itself
((UriMapper)App.RootFrame.UriMapper).UriMappings[0].MappedUri = 
    new Uri("/MainPage.xaml", UriKind.Relative);

// Since RootFrame.CurrentSource is still set to MainPage, you need to pass
// some dummy query string to force the navigation
App.RootFrame.Navigate(new Uri("/MainPage.xaml?dummy=1", UriKind.Relative));

// Remove back entry so that if user taps the back button 
// you won't get back to tutorial
App.RootFrame.RemoveBackEntry();

这篇关于在 Windows Phone 8 中更改 UriMapper 后重定向页面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！