框架中的WPF页面导航，如何从我导航到的页面访问我的原始框架？

Question

我从我的MainPage.xaml.cs中去到了一个叫做Einstellungen的页面。

private void button_Copy_Click(object sender, RoutedEventArgs e) 
{ 
    Einstellungen einstellungen = new Einstellungen(); 
    _mainFrame.Content = einstellungen; 
} 

MainPage.xaml有一个框架，名为_mainFrame。 Einstellungen设置_mainFrame到页Einstellungen

<Page 
x:Class="ProjectMoralsKite.MainPage" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:local="using:ProjectMoralsKite" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d"> 

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> 
    <VisualStateManager.VisualStateGroups> 
     <VisualStateGroup x:Name="VisualStateGroup"> 
      <VisualState x:Name="_5__Phone"> 
       <VisualState.StateTriggers> 
        <AdaptiveTrigger MinWindowHeight="640" MinWindowWidth="360"/> 
       </VisualState.StateTriggers> 
      </VisualState> 
      <VisualState x:Name="_6__Phone"> 
       <VisualState.StateTriggers> 
        <AdaptiveTrigger MinWindowHeight="768" MinWindowWidth="432"/> 
       </VisualState.StateTriggers> 
       <VisualState.Setters> 
        <Setter Target="textBlock.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>10,40,0,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="textBlock.(FrameworkElement.Width)" Value="412"/> 
        <Setter Target="button.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>10,251,0,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button.(FrameworkElement.Width)" Value="412"/> 
        <Setter Target="button_Copy.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>10,336,0,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button_Copy.(FrameworkElement.Width)" Value="412"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Width)" Value="412"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>10,421,0,0</Thickness> 
         </Setter.Value> 
        </Setter> 
       </VisualState.Setters> 
      </VisualState> 
      <VisualState x:Name="_8__Tablet"> 
       <VisualState.StateTriggers> 
        <AdaptiveTrigger MinWindowHeight="640" MinWindowWidth="1024"/> 
       </VisualState.StateTriggers> 
       <VisualState.Setters> 
        <Setter Target="button_Copy.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>370,258,362,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button_Copy.(FrameworkElement.HorizontalAlignment)" Value="Stretch"/> 
        <Setter Target="button_Copy.(FrameworkElement.Width)" Value="NaN"/> 
        <Setter Target="textBlock.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>10,40,10,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="textBlock.(FrameworkElement.HorizontalAlignment)" Value="Stretch"/> 
        <Setter Target="textBlock.(FrameworkElement.Width)" Value="NaN"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>0,397,34,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button_Copy1.(FrameworkElement.HorizontalAlignment)" Value="Right"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Width)" Value="292"/> 
        <Setter Target="button.(FrameworkElement.Height)" Value="206"/> 
        <Setter Target="button.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>48,142,0,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button.(FrameworkElement.Width)" Value="292"/> 
        <Setter Target="button_Copy.(FrameworkElement.Height)" Value="206"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Height)" Value="207"/> 
       </VisualState.Setters> 
      </VisualState> 
      <VisualState x:Name="_12__Tablet"> 
       <VisualState.StateTriggers> 
        <AdaptiveTrigger MinWindowHeight="960" MinWindowWidth="1440"/> 
       </VisualState.StateTriggers> 
       <VisualState.Setters> 
        <Setter Target="button_Copy.(FrameworkElement.Height)" Value="NaN"/> 
        <Setter Target="button_Copy.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>563,237,548,64</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button_Copy.(FrameworkElement.VerticalAlignment)" Value="Stretch"/> 
        <Setter Target="button_Copy.(FrameworkElement.HorizontalAlignment)" Value="Stretch"/> 
        <Setter Target="button_Copy.(FrameworkElement.Width)" Value="NaN"/> 
        <Setter Target="button.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>141,237,0,64</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button.(FrameworkElement.VerticalAlignment)" Value="Stretch"/> 
        <Setter Target="button.(FrameworkElement.Height)" Value="NaN"/> 
        <Setter Target="button.(FrameworkElement.Width)" Value="329"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>0,237,123,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="button_Copy1.(FrameworkElement.HorizontalAlignment)" Value="Right"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Width)" Value="329"/> 
        <Setter Target="button_Copy1.(FrameworkElement.Height)" Value="659"/> 
        <Setter Target="textBlock.(FrameworkElement.Margin)"> 
         <Setter.Value> 
          <Thickness>10,40,10,0</Thickness> 
         </Setter.Value> 
        </Setter> 
        <Setter Target="textBlock.(FrameworkElement.HorizontalAlignment)" Value="Stretch"/> 
        <Setter Target="textBlock.(FrameworkElement.Width)" Value="NaN"/> 
       </VisualState.Setters> 
      </VisualState> 
     </VisualStateGroup> 
    </VisualStateManager.VisualStateGroups> 
    <Frame x:Name="_mainFrame" Background="#FF0070B7"> 
     <Grid> 
      <Button x:Name="button" Content="&#xD;&#xA;Aufträge&#xD;&#xA;" HorizontalAlignment="Left" Margin="10,251,-275.333,-165" VerticalAlignment="Top" Height="80" Width="340" d:LayoutOverrides="LeftMargin, RightMargin, TopMargin, BottomMargin, TopPosition, BottomPosition"/> 
      <TextBlock x:Name="textBlock" TextAlignment="Center" HorizontalAlignment="Left" Margin="10,40,-278.333,-58" TextWrapping="Wrap" Text="ProjectMoralsKite" VerticalAlignment="Top" Height="48" Width="340" FontSize="29.333" d:LayoutOverrides="LeftMargin, RightMargin, TopMargin, BottomMargin, LeftPosition, RightPosition"/> 
      <Button x:Name="button_Copy" Content="Einstellungen" HorizontalAlignment="Left" Margin="10,336,-275.333,-250" VerticalAlignment="Top" Height="80" Width="340" Click="button_Copy_Click" d:LayoutOverrides="LeftPosition, RightPosition, TopPosition, BottomPosition"/> 
      <Button x:Name="button_Copy1" Content="Über" HorizontalAlignment="Left" Margin="10,421,-275.333,-335" VerticalAlignment="Top" Height="80" Width="340" d:LayoutOverrides="LeftMargin, RightMargin, TopMargin, BottomMargin"/> 
     </Grid> 
    </Frame> 


</Grid> 

namespace ProjectMoralsKite 
{ 

// Eine leere Seite, die eigenständig verwendet werden kann oder auf die innerhalb eines Rahmens navigiert werden kann. 
// </summary> 
public sealed partial class Einstellungen : Page 
{ 

    public Einstellungen() 
    { 
     this.InitializeComponent(); 
    } 

    public string foregroundProperty { get; set; } 

    private void button_Click(object sender, RoutedEventArgs e) 
    { 


     if(radioButton.IsChecked == true) 
     { 
      Color black = Color.FromArgb(255, 0, 0, 0); 
      SolidColorBrush brush1 = new SolidColorBrush(black); 
      textBlock.Foreground = brush1; 
      textBlock1.Foreground = brush1; 
      radioButton.Foreground = brush1; 
      radioButton1.Foreground = brush1; 





      //here I want to set the Page of the frame to MainPage.xaml!!! 



     } 
     else if (radioButton1.IsChecked == true) 
     { 
      Color white = Color.FromArgb(255, 255, 255, 255); 
      SolidColorBrush brush2 = new SolidColorBrush(white); 
      textBlock.Foreground = brush2; 
      textBlock1.Foreground = brush2; 
      radioButton.Foreground = brush2; 
      radioButton1.Foreground = brush2; 

      //here I want to set the Page of the frame to MainPage.xaml!!! 
     } 





    } 
} 

}

含量的按钮现在我在Einstellungen一个按钮，应该使帧的内容再炫魅。但是在我的Einstellungen.xaml.cs文件中我当然不能访问我的_mainFrame！我怎样才能做到这一点？

Answer 1

您可以通过Windows.UI.Xaml.Window.Current.Content访问根框架。请注意，这不是您在MainPage中添加到XAML的框架。它是应用程序的根框架。但是你可以用它来获取根框架的内容。

var rootFrame = Window.Current.Content as Frame; 
var mainPage = rootFrame.Content as MainPage; 
var yourFrame = mainPage.Content as Frame; //here I'm not sure because I don't see whole XAML of MainPage 

要导航，您应该使用Navigate方法。

_mainFrame.Navigate(typeof(Einstellungen)); 

最后一件事：WPF != win-universal-app您应详细说明你的问题

Answer 2

var rootFrame = Window.Current.Content as Frame; 
var mainPage = rootFrame.Content as MainPage; 
rootFrame.Navigate(typeof(MainPage)); 

这样，它的工作原理。 Thx