如何获取当前绑定到文本框的值？

我有一个文本框内的一个FlipView绑定到标题属性，它显示了一个页面的当前标题。

<TextBlock x:Name="jmeno" FontSize="26.667" FontWeight="Light" Text="{Binding Title}" TextWrapping="Wrap" />

而且我有一个显示视频的媒体元素。

<MediaElement x:Name="mmedia" Source="Video/prvniVideo.mp4" Height="300" Grid.Row="1" KeyUp="mmedia_KeyUp" />

我想在不同的页面打开不同的视频，我试图完成它像这样 - 阅读是决定texblock和基地的实际显示值，视频媒体元素打开。

就是这样。

 string AktualniStranka; 
     AktualniStranka = jmeno.Text; 

     if (AktualniStranka == "Exercise 1") 
     { 
      mmedia.Source = new Uri("ms-appx:/Video/prvniVideo.mp4", UriKind.RelativeOrAbsolute); 
      mmedia.Play(); 
     } 
     else 
     { 
      mmedia.Source = new Uri("ms-appx:/Video/Gumm.mp4", UriKind.RelativeOrAbsolute); 
      mmedia.Play(); 
     }

但它不工作 - 我试图阅读文本块的只是文本，并把它放在另一个文本块，它不工作要么，我花了几乎一整天时间，使其工作。请帮家伙:)

全XAML代码：

<common:LayoutAwarePage 
x:Name="pageRoot" 
x:Class="ContosoCookbook.ItemDetailPage" 
DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:local="using:ContosoCookbook" 
xmlns:data="using:ContosoCookbook.Data" 
xmlns:common="using:ContosoCookbook.Common" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d"> 

<Page.Resources> 

    <!-- Collection of items displayed by this page --> 
    <Style x:Name="transportStyle" TargetType="Button"> 
     <Setter Property="Height" Value="40" /> 
     <Setter Property="Width" Value="75" /> 
     <Setter Property="FontSize" Value="11" /> 
    </Style> 

    <CollectionViewSource 
     x:Name="itemsViewSource" 
     Source="{Binding Items}" 
     d:Source="{Binding AllGroups[0].Items, Source={d:DesignInstance Type=data:SampleDataSource, IsDesignTimeCreatable=True}}"/> 

    <common:ListConverter x:Key="ListConverter" /> 

    <Style x:Key="BragAppBarButtonStyle" TargetType="Button" BasedOn="{StaticResource AppBarButtonStyle}"> 
     <Setter Property="AutomationProperties.AutomationId" Value="BragAppBarButton"/> 
     <Setter Property="AutomationProperties.Name" Value="Brag"/> 
     <Setter Property="Content" Value="&#xE170;"/> 
    </Style> 

    <Style x:Key="ReminderAppBarButtonStyle" TargetType="Button" BasedOn="{StaticResource AppBarButtonStyle}"> 
     <Setter Property="AutomationProperties.AutomationId" Value="ReminderAppBarButton"/> 
     <Setter Property="AutomationProperties.Name" Value="Reminder"/> 
     <Setter Property="Content" Value="&#xE121;"/> 
    </Style> 

    <local:ProductLicenseDataSource x:Key="License" /> 
    <common:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/> 

</Page.Resources> 

<Page.BottomAppBar> 
    <AppBar x:Name="PageAppBar" Padding="10,0,10,0"> 
     <Grid> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="50*"/> 
       <ColumnDefinition Width="50*"/> 
      </Grid.ColumnDefinitions> 
      <StackPanel x:Name="LeftCommands" Orientation="Horizontal" Grid.Column="0" HorizontalAlignment="Left"> 
       <Button x:Name="BragButton" HorizontalAlignment="Left" Style="{StaticResource BragAppBarButtonStyle}" Click="OnBragButtonClicked" /> 
       <Button x:Name="PinRecipeButton" HorizontalAlignment="Left" Style="{StaticResource PinAppBarButtonStyle}" Click="OnPinRecipeButtonClicked" /> 
       <Button x:Name="ReminderButton" HorizontalAlignment="Left" Style="{StaticResource ReminderAppBarButtonStyle}" Click="OnReminderButtonClicked" /> 
      </StackPanel> 
      <StackPanel x:Name="RightCommands" Orientation="Horizontal" Grid.Column="1" HorizontalAlignment="Right"> 
      </StackPanel> 
     </Grid> 
    </AppBar> 
</Page.BottomAppBar> 


<!-- 
    This grid acts as a root panel for the page that defines two rows: 
    * Row 0 contains the back button and page title 
    * Row 1 contains the rest of the page layout 
--> 
<Grid 
    Style="{StaticResource LayoutRootStyle}" 
    DataContext="{Binding Group}" 
    d:DataContext="{Binding AllGroups[0], Source={d:DesignInstance Type=data:SampleDataSource, IsDesignTimeCreatable=True}}"> 

    <Grid.RowDefinitions> 
     <RowDefinition Height="140"/> 
     <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 


    <!-- 
     The remainder of the page is one large FlipView that displays details for 
     one item at a time, allowing the user to flip through all items in the chosen 
     group 
    --> 


    <FlipView 
     x:Name="flipView" 
     AutomationProperties.AutomationId="ItemsFlipView" 
     AutomationProperties.Name="Item Details" 
     TabIndex="1" 
     Grid.RowSpan="2" 
     ItemsSource="{Binding Source={StaticResource itemsViewSource}}"> 

     <FlipView.ItemContainerStyle> 
      <Style TargetType="FlipViewItem"> 
       <Setter Property="Margin" Value="0,137,0,0"/> 
      </Style> 
     </FlipView.ItemContainerStyle> 

     <FlipView.ItemTemplate> 
      <DataTemplate> 
       <UserControl Loaded="StartLayoutUpdates" Unloaded="StopLayoutUpdates"> 
        <ScrollViewer x:Name="scrollViewer" Style="{StaticResource VerticalScrollViewerStyle}" Grid.Row="1"> 

         <!-- Three-column grid for item-detail layout --> 
         <Grid Margin="120,0,20,20"> 
          <Grid.ColumnDefinitions> 
           <ColumnDefinition Width="600" /> 
           <ColumnDefinition Width="40" /> 
           <ColumnDefinition /> 
          </Grid.ColumnDefinitions> 

          <StackPanel Orientation="Vertical" Grid.Column="0"> 
           <TextBlock x:Name="jmeno" FontSize="26.667" FontWeight="Light" Text="{Binding Title}" TextWrapping="Wrap" /> 





          </StackPanel> 

          <StackPanel Orientation="Vertical" Grid.Column="4"> 
           <TextBlock FontSize="26.667" FontWeight="Light" Text="Description" Margin="0,0,0,16"/> 




           <TextBlock FontSize="26.667" FontWeight="Light" Text="{Binding ShortDesctiption}" TextWrapping="Wrap"/> 
           <ScrollViewer Style="{StaticResource VerticalScrollViewerStyle}"> 
            <Grid> 
             <TextBlock FontSize="20" FontWeight="Light" Text="{Binding Directions}" TextWrapping="Wrap" Visibility="{Binding IsLicensed, Source={StaticResource License}, Converter={StaticResource BooleanToVisibilityConverter }}" /> 
             <Button Width="225" Height="120" Background="#30ffffff" Click="OnPurchaseProduct" Visibility="{Binding IsTrial, Source={StaticResource License}, Converter={StaticResource BooleanToVisibilityConverter }}"> 
              <Button.Content> 
               <TextBlock Text="{Binding FormattedPrice, Source={StaticResource License}}" TextWrapping="Wrap" TextAlignment="Center" /> 
              </Button.Content> 
             </Button> 
            </Grid> 
           </ScrollViewer> 
          </StackPanel> 
         </Grid> 

         <VisualStateManager.VisualStateGroups> 
          <!-- Visual states reflect the app's view state inside the FlipView --> 
          <VisualStateGroup x:Name="ApplicationViewStates"> 
           <VisualState x:Name="FullScreenLandscape"/> 
           <VisualState x:Name="Filled"/> 

           <!-- Respect the narrower 100-pixel margin convention for portrait --> 
           <VisualState x:Name="FullScreenPortrait"> 
            <Storyboard> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetName="image" Storyboard.TargetProperty="MaxHeight"> 
              <DiscreteObjectKeyFrame KeyTime="0" Value="400"/> 
             </ObjectAnimationUsingKeyFrames> 
            </Storyboard> 
           </VisualState> 

           <!-- When snapped, the content is reformatted and scrolls vertically --> 
           <VisualState x:Name="Snapped"> 
            <Storyboard> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetName="scrollViewer" Storyboard.TargetProperty="Style"> 
              <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource VerticalScrollViewerStyle}"/> 
             </ObjectAnimationUsingKeyFrames> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetName="image" Storyboard.TargetProperty="MaxHeight"> 
              <DiscreteObjectKeyFrame KeyTime="0" Value="160"/> 
             </ObjectAnimationUsingKeyFrames> 
            </Storyboard> 
           </VisualState> 
          </VisualStateGroup> 
         </VisualStateManager.VisualStateGroups> 
        </ScrollViewer> 
       </UserControl> 
      </DataTemplate> 

     </FlipView.ItemTemplate> 
    </FlipView> 
    <!-- MEDIA PANEL--> 

    <StackPanel Orientation="Vertical" Grid.Row="1" > 
     <Border BorderThickness="5" BorderBrush="White" Background="Black" HorizontalAlignment="Left" Margin="165,50,0,0" VerticalAlignment="Top"> 
      <ContentControl x:Name="VideoContainer" Height="300" KeyUp="VideoContainer_KeyUp"  > 

       <MediaElement x:Name="mmedia" Source="Video/prvniVideo.mp4" Height="300" Grid.Row="1" KeyUp="mmedia_KeyUp" /> 
      </ContentControl> 
     </Border> 

     <StackPanel Orientation="Horizontal" Margin="140,20,0,0"> 
      <Button Name="btnPlay" Click="btnPlay_Click" 
     Style="{StaticResource transportStyle}" Content="Play" /> 
      <Button Name="btnPause" Click="btnPause_Click" 
     Style="{StaticResource transportStyle}" Content="Pause" /> 
      <Button Name="btnStop" Click="btnStop_Click" 
     Style="{StaticResource transportStyle}" Content="Stop" /> 
      <Button Name="btnReverse" Click="btnReverse_Click" 
     Style="{StaticResource transportStyle}" Content="Rewind" /> 
      <Button Name="btnForward" Click="btnForward_Click" 
     Style="{StaticResource transportStyle}" Content="Forward" /> 
      <Button Name="btnVolumeUp" Click="btnVolumeUp_Click" 
     Style="{StaticResource transportStyle}" Content="-" /> 
      <Button Name="btnVolumeDown" Click="btnVolumeDown_Click" 
     Style="{StaticResource transportStyle}" Content="+" /> 
      <Button Name="btnMute" Click="btnMute_Click" 
     Style="{StaticResource transportStyle}" Content="Mute" /> 
     </StackPanel> 
     <Button x:Name="btnFullScreenToggle" Click="btnFullScreenToggle_Click" 
     Style="{StaticResource transportStyle}" Content="Full Screen ON" Margin="290,0,0,0" Width="302" /> 

     <TextBlock x:Name="poser" FontSize="26.667" FontWeight="Light" Text="poser" TextWrapping="Wrap" /> 


    </StackPanel> 


    <!-- FlipView used in portrait mode --> 
    <FlipView 
     x:Name="portraitFlipView" 
     AutomationProperties.AutomationId="ItemsFlipView" 
     AutomationProperties.Name="Item Details" 
     Grid.Row="1" 
     Margin="0,-3,20,0" 
     ItemsSource="{Binding Source={StaticResource itemsViewSource}}" 
     Visibility="Collapsed"> 

     <FlipView.ItemTemplate> 
      <DataTemplate> 
       <UserControl Loaded="StartLayoutUpdates" Unloaded="StopLayoutUpdates"> 
        <ScrollViewer x:Name="scrollViewer" Style="{StaticResource VerticalScrollViewerStyle}" Grid.Row="1"> 

         <!-- Vertical StackPanel for item-detail layout --> 
         <StackPanel Orientation="Vertical" Margin="100,0,20,0"> 
          <StackPanel Orientation="Vertical"> 
           <TextBlock FontSize="26.667" FontWeight="Light" Text="{Binding Title}" TextWrapping="Wrap"/> 
           <Image x:Name="image" Width="400" Margin="0,20,0,40" Stretch="Uniform" Source="{Binding Image}" HorizontalAlignment="Left"/> 
          </StackPanel> 

          <StackPanel Orientation="Vertical"> 
           <TextBlock FontSize="26.667" FontWeight="Light" Text="Ingredients" Margin="0,0,0,16"/> 
           <TextBlock FontSize="20" FontWeight="Light" LineHeight="32.5" Text="{Binding Ingredients, Converter={StaticResource ListConverter}}" TextWrapping="Wrap" /> 
          </StackPanel> 

          <StackPanel Orientation="Vertical"> 
           <TextBlock FontSize="26.667" FontWeight="Light" Text="Directions" Margin="0,24,0,16"/> 
           <ScrollViewer Style="{StaticResource VerticalScrollViewerStyle}"> 
            <Grid> 
             <TextBlock FontSize="20" FontWeight="Light" Text="{Binding Directions}" TextWrapping="Wrap" Visibility="{Binding IsLicensed, Source={StaticResource License}, Converter={StaticResource BooleanToVisibilityConverter }}" /> 
             <Button Width="225" Height="120" Background="#30ffffff" Click="OnPurchaseProduct" Visibility="{Binding IsTrial, Source={StaticResource License}, Converter={StaticResource BooleanToVisibilityConverter }}"> 
              <Button.Content> 
               <TextBlock Text="{Binding FormattedPrice, Source={StaticResource License}}" TextWrapping="Wrap" TextAlignment="Center" /> 
              </Button.Content> 
             </Button> 

            </Grid> 
           </ScrollViewer> 
          </StackPanel> 
         </StackPanel> 
        </ScrollViewer> 
       </UserControl> 
      </DataTemplate> 
     </FlipView.ItemTemplate> 
    </FlipView> 

    <FlipView 
     x:Name="snappedFlipView" 
     AutomationProperties.AutomationId="ItemsFlipView" 
     AutomationProperties.Name="Item Details" 
     Grid.Row="1" 
     Margin="0,-3,0,0" 
     ItemsSource="{Binding Source={StaticResource itemsViewSource}}" 
     Visibility="Collapsed"> 

     <FlipView.ItemTemplate> 
      <DataTemplate> 
       <UserControl Loaded="StartLayoutUpdates" Unloaded="StopLayoutUpdates"> 
        <ScrollViewer x:Name="scrollViewer" Style="{StaticResource VerticalScrollViewerStyle}" Grid.Row="1"> 

         <!-- Vertical StackPanel for item-detail layout --> 
         <StackPanel Orientation="Vertical" Margin="20,0,20,0"> 
          <StackPanel Orientation="Vertical"> 
           <TextBlock FontSize="20" FontWeight="Light" Text="{Binding Title}" TextWrapping="Wrap"/> 
           <Image x:Name="image" Width="260" Margin="0,12,0,40" Stretch="Uniform" Source="{Binding Image}" HorizontalAlignment="Left"/> 
          </StackPanel> 
          <StackPanel Orientation="Vertical"> 
           <TextBlock FontSize="20" FontWeight="Light" Text="Ingredients" Margin="0,0,0,16"/> 
           <TextBlock FontSize="16" FontWeight="Light" TextWrapping="Wrap" Text="{Binding Ingredients, Converter={StaticResource ListConverter}}" /> 
          </StackPanel> 
         </StackPanel> 
        </ScrollViewer> 
       </UserControl> 
      </DataTemplate> 
     </FlipView.ItemTemplate> 
    </FlipView> 

    <!-- Back button and page title --> 
    <Grid HorizontalAlignment="Left" > 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition Width="Auto"/> 
      <ColumnDefinition Width="*"/> 
     </Grid.ColumnDefinitions> 
     <Button x:Name="backButton" Click="GoBack" IsEnabled="{Binding Frame.CanGoBack, ElementName=pageRoot}" Style="{StaticResource BackButtonStyle}"/> 
     <TextBlock x:Name="pageTitle" Text="{Binding Title}" Style="{StaticResource PageHeaderTextStyle}" Grid.Column="1" IsHitTestVisible="false"/> 
     <Button Name="btnFullScreenOff" Click="btnFullScreenToggle_Click" 
     Style="{StaticResource transportStyle}" Content="Full Screen OFF" HorizontalAlignment="Right" Grid.Column="1" Margin="0,56,495,36" RenderTransformOrigin="-9.161,0.266" Height="48" Width="106" Visibility="Collapsed" /> 
    </Grid> 

    <VisualStateManager.VisualStateGroups> 

     <!-- Visual states reflect the application's view state --> 
     <VisualStateGroup x:Name="ApplicationViewStates"> 
      <VisualState x:Name="FullScreenLandscape"/> 
      <VisualState x:Name="Filled"/> 

      <!-- The back button respects the narrower 100-pixel margin convention for portrait --> 
      <VisualState x:Name="FullScreenPortrait"> 
       <Storyboard> 
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" Storyboard.TargetProperty="Style"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PortraitBackButtonStyle}"/> 
        </ObjectAnimationUsingKeyFrames> 

        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="flipView" Storyboard.TargetProperty="Visibility"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/> 
        </ObjectAnimationUsingKeyFrames> 
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="portraitFlipView" Storyboard.TargetProperty="Visibility"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/> 
        </ObjectAnimationUsingKeyFrames> 

       </Storyboard> 
      </VisualState> 

      <!-- The back button and title have different styles when snapped --> 
      <VisualState x:Name="Snapped"> 
       <Storyboard> 
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" Storyboard.TargetProperty="Style"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedBackButtonStyle}"/> 
        </ObjectAnimationUsingKeyFrames> 
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="pageTitle" Storyboard.TargetProperty="Style"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedPageHeaderTextStyle}"/> 
        </ObjectAnimationUsingKeyFrames> 
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="flipView" Storyboard.TargetProperty="Visibility"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/> 
        </ObjectAnimationUsingKeyFrames> 
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="snappedFlipView" Storyboard.TargetProperty="Visibility"> 
         <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/> 
        </ObjectAnimationUsingKeyFrames> 

       </Storyboard> 
      </VisualState> 
     </VisualStateGroup> 
    </VisualStateManager.VisualStateGroups> 
</Grid>

完整的C＃代码：

来源

2013-05-27 Bohuslav

对错别字的抱歉，我只是累了，所以只是说对不起.. – Bohuslav

什么时候以及如何尝试读取Text属性的上下文将是解决您的问题（例如事件处理程序）所必需的。如果您解释了您在工作失败时所观察到的内容，也很有用。调试器告诉你什么，事件处理程序被击中等）。这里没有足够的信息。 –

正确的，我们需要确定绑定是否是问题，或者它可能是其他问题。检查你的输出并告诉我们用调试器看到什么值。 Thks – Ouarzy

我所看到的是你试图从你的Textblock（jmeno）的名字得到显示的值，对不对？

你不应该那样做。您的文本块是在数据模板中定义的，为其分配名称的唯一原因是应用故事板。

你应该做的是让你的Flipview的SelectedItem对象（这是你的可视化元素datacontext），并获得该数据对象的Title属性。

这样：

（flipView.SelectedItem为-WhateverYourTypeIs - ）标题，并有你应该有你的价值。

来源

2013-05-28 08:27:46 Miiite

这正是我想要做的:)和基地od值显示适当的视频，我相信代码运行良好:) 我要去尝试你的解决方案，谢谢你提前。 – Bohuslav

我不知道如果我的解决方案正确，请帮助我。为了测试的目的，我创建了一个文本块，我正在修整以获取当前的“jmeno”文本框的值中的代码 – Bohuslav

后面我用这个功能（是你的意思？）私人的DependencyObject FindChildControl （DependencyObject的控制，串ctrlName） { int childNumber = VisualTreeHelper.GetChildrenCount（control）; （int i = 0; i （儿童，ctrlName）; if（nextLevel！= null） return nextLevel; } } return null; } – Bohuslav

如何获取当前绑定到文本框的值？

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