链接依赖属性xaml wpf

我有一个用户控件，我希望通过它的父级xaml（本例中是一个wpf页面）进行访问。我的用户控件有一个标签属性，我希望通过将页面xaml绑定到传递到页面xaml的datacontext来设置它。链接依赖属性xaml wpf

在下面的示例中，xaml页面中的数据绑定似乎正常工作。我可以通过页面xaml设置用户控件标签的内容，只要我不尝试将其绑定到页面datacontext，当我尝试这样做时，标签始终显示为空白。

我遵循了本网站上提出的其他一些相关示例，但到目前为止还没有找到我要出错的地方。任何建议将不胜感激。

用户控件XAML

<UserControl x:Class="Pipeline_General.Custom_Controls.AttributeStack" 
     xmlns:pm="clr-namespace:Pipeline_General" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     mc:Ignorable="d" 
     DataContext = "{Binding RelativeSource={RelativeSource Self}}" 
     d:DesignHeight="30" d:DesignWidth="300"> 
<Grid> 
    <Grid.ColumnDefinitions> 
     <ColumnDefinition Width="2*" /> 
     <ColumnDefinition Width="3*" /> 
    </Grid.ColumnDefinitions> 
    <Label Foreground="{x:Static pm:myBrushes.pink}" Content="{Binding Path=Attr}" Grid.Column="0" HorizontalAlignment="Right" FontFamily="Calibri" FontSize="14" Margin="5,0,5,0"/> 
    <Label x:Name="ValLabel" Foreground="{x:Static pm:myBrushes.blue}" Grid.Column="1" HorizontalAlignment="Left" FontFamily="Calibri" FontSize="14" Margin="5,0,5,0"/> 
</Grid>

用户控件代码背后

public partial class AttributeStack : UserControl 
{ 


    public static readonly DependencyProperty AttrProperty = DependencyProperty.Register 
     (
      "Attr", 
      typeof(string), 
      typeof(AttributeStack), 
      new PropertyMetadata(string.Empty) 
     ); 

    public static readonly DependencyProperty ValProperty = DependencyProperty.Register 
      (
       "Val", 
       typeof(string), 
       typeof(AttributeStack), 
       new PropertyMetadata(string.Empty) 
      ); 

    public static readonly DependencyProperty ValTextProperty = DependencyProperty.Register 
     (
       "ValText", 
       typeof(string), 
       typeof(AttributeStack), 
       new PropertyMetadata(string.Empty) 
     ); 

    public string Val 
    { 
     get { return (string)GetValue(ValProperty); } 
     set { SetValue(ValProperty, value); } 
    } 

    public string ValText 
    { 
     get { return (string)GetValue(ValTextProperty); } 
     set { SetValue(ValTextProperty, value); } 
    } 


    public string Attr 
    { 
     get { return (string)GetValue(AttrProperty); } 
     set { SetValue(AttrProperty, value); } 
    } 


    public AttributeStack() 
    { 
     InitializeComponent(); 

     Binding valBinding = new Binding("Val") 
     { 
      Source = Val, 
      Mode = BindingMode.OneWay 
     }; 

     Binding textBinding = new Binding("Content") 
     { 
      Source = this.ValLabel.Content, 
      Mode = BindingMode.OneWay 
     }; 

     ValLabel.SetBinding(Label.ContentProperty, valBinding); 
     this.SetBinding(AttributeStack.ValTextProperty, textBinding); 
    } 
}

页XAML

<Page x:Class="Pipeline_General.SceneView" x:Name="page" 
    xmlns:pm="clr-namespace:Pipeline_General" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    mc:Ignorable="d" 
    xmlns:cc="clr-namespace:Pipeline_General.Custom_Controls" 
    d:DesignHeight="800" d:DesignWidth="600" 
    DataContext = "{Binding RelativeSource={RelativeSource Self}}" 
    Title="SceneView"> 
<Grid> 
    <ScrollViewer> 
     <Grid> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="*" /> 
       <ColumnDefinition Width="*" /> 
      </Grid.ColumnDefinitions> 
      <StackPanel Grid.Column="0"> 
       <Expander IsExpanded="True" Margin="5"> 
        <Expander.Header> 
         <Grid x:Name="Grid" HorizontalAlignment="Stretch" Width="NaN"> 
          <Border x:Name="Border" Background="Transparent" HorizontalAlignment="Stretch" BorderBrush="{x:Static pm:myBrushes.blue}" BorderThickness="0,0,0,1" 
         Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Expander}}, Path=ActualWidth}"> 
           <TextBlock x:Name="HeaderText" FontSize ="18" FontFamily="Calibri" Foreground="{x:Static pm:myBrushes.blue}" Text="General Info: " /> 
          </Border> 
         </Grid> 
        </Expander.Header> 
        <StackPanel> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Title:" Val="{Binding Path=DataContext.Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Episode:" Val="{Binding Path=DataContext.episode.Key, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Sequence:" Val="{Binding Path=DataContext.sequence.Key, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Scene:" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Assigned:" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Status:" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Last Saved (Time):" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Last Saved (User):" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Due:" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
        </StackPanel> 
       </Expander> 
      </StackPanel> 

      <StackPanel Grid.Column="1"> 
       <cc:Playblast_Viewer x:Name="PlayblastView"/> 
       <cc:FeedbackCtrl Header="Feedback:"/> 
       <cc:FeedbackCtrl Header="NoticeBoard:"/> 
      </StackPanel> 

     </Grid> 
    </ScrollViewer> 
</Grid>

标签结合DataContext.Title字段似乎是工作，并设置ATTR字段似乎正确工作/作为也在意料之中。因此，它只是Val域，我不能工作..

已更新，其中包括页面代码后面。尽管这里几乎没有任何事情发生。

public partial class SceneView : Page 
{ 
    public Scene scene { get; set; } 
    public SceneView(Scene s) 
    { 
     InitializeComponent(); 
     scene = s; 
     this.DataContext = scene; 
    } 
}

我明白，即时通讯的IM非常漂亮，所以我很有可能尝试做更好的完全不同的方式。在这种情况下，场景对象具有多个使用页面和用户控件进行公开的字段。我编写了完整的应用程序在没有任何xaml的代码背后，但现在我正在尝试自学xaml并让原型的下一个版本更加流畅，并将所需编码减少了80％。

场景对象，它是页面对象的数据上下文，我试图发送字段到用户控件，即。 page.DataContext.episode.Key是代码后面的合法字段。通过上面的xaml我正在寻找它的值发送到Val字段，然后Val字段将更新ValText（用户控件中的标签）内容属性。

来源

2014-08-30 xxdefaultxx

链/布线是从不与依赖属性的问题。对我来说，你的逻辑似乎有点纠结。我发现有点难以想象所需。如果你能为相同的东西画出一些东西，我会很感激。即。财产来源，调解人和目标。 – pushpraj 2014-08-30 05:45:30

你能分享页面背后的代码吗？ – 2014-08-30 06:05:36

请看这里http://stackoverflow.com/questions/23482734/wpf-chain-binding?rq=1 – Developer 2014-08-30 06:46:00

我找到了问题/问题。他们中的大多数人，因为我仍然是一个新手在XAML。

我意识到datacontext不访问字段，如果他们没有与get/set访问器声明。我在后面的页面代码中更改了场景声明，以便它成为依赖项对象而不是链接绑定我使用依赖项属性更改事件来设置usercontrols标签内容。

public partial class AttributeStack : UserControl 
{ 
    #region Val (DependencyProperty) 
    public string Val 
    { 
     get { return (string)GetValue(ValProperty); } 
     set { SetValue(ValProperty, value); } 
    } 
    public static readonly DependencyProperty ValProperty = 
     DependencyProperty.Register("Val", typeof(string), typeof(AttributeStack), 
      new PropertyMetadata { PropertyChangedCallback = ValChanged }); 
    private static void ValChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
    { 
     AttributeStack aStack = d as AttributeStack; 
     if (aStack != null && e.NewValue != null) 
     { 
      aStack.ValLabel.Content = e.NewValue.ToString(); 
     } 
    } 
    #endregion 

    public static readonly DependencyProperty AttrProperty = DependencyProperty.Register 
     (
      "Attr", 
      typeof(string), 
      typeof(AttributeStack), 
      new PropertyMetadata(string.Empty) 
     ); 

    public string Attr 
    { 
     get { return (string)GetValue(AttrProperty); } 
     set { SetValue(AttrProperty, value); } 
    } 

    public AttributeStack() 
    { 
     InitializeComponent(); 
    } 
}

}

public partial class SceneView : Page 
{ 
    public static readonly DependencyProperty sceneProperty = DependencyProperty.Register 
     (
      "scene", 
      typeof(Scene), 
      typeof(SceneView) 
     ); 

    public Scene scene 
    { 
     get { return (Scene)GetValue(sceneProperty); } 
     set { SetValue(sceneProperty, value); } 
    } 
    public SceneView(Scene s) 
    { 
     InitializeComponent(); 
     scene = s; 

     this.DataContext = scene; 
    } 
} 

<Page x:Class="Pipeline_General.SceneView" x:Name="page" 
    xmlns:pm="clr-namespace:Pipeline_General" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    mc:Ignorable="d" 
    xmlns:cc="clr-namespace:Pipeline_General.Custom_Controls" 
    d:DesignHeight="800" d:DesignWidth="600" 
    DataContext = "{Binding RelativeSource={RelativeSource Self}}" 
    Title="SceneView"> 
<Grid> 
    <ScrollViewer> 
     <Grid> 
      <Grid.ColumnDefinitions> 
       <ColumnDefinition Width="*" /> 
       <ColumnDefinition Width="*" /> 
      </Grid.ColumnDefinitions> 
      <StackPanel Grid.Column="0"> 
       <Expander IsExpanded="True" Margin="5"> 
        <Expander.Header> 
         <Grid x:Name="Grid" HorizontalAlignment="Stretch" Width="NaN"> 
          <Border x:Name="Border" Background="Transparent" HorizontalAlignment="Stretch" BorderBrush="{x:Static pm:myBrushes.blue}" BorderThickness="0,0,0,1" 
         Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Expander}}, Path=ActualWidth}"> 
           <TextBlock x:Name="HeaderText" FontSize ="18" FontFamily="Calibri" Foreground="{x:Static pm:myBrushes.blue}" Text="General Info: " /> 
          </Border> 
         </Grid> 
        </Expander.Header> 
        <StackPanel> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Title:" Val="{Binding Path=scene.Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Episode:" Val="{Binding Path=scene.episode.Key, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Sequence:" Val="{Binding Path=scene.sequence.Key, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Scene:" Val="{Binding Path=scene.Key, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Assigned:" Val="{}"/> 

         <cc:AttributeStack Attr="Status:" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Last Saved (Time):" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <cc:AttributeStack Attr="Last Saved (User):" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
         <Separator Foreground="Transparent" Height="0" Margin="5"/> 
         <cc:AttributeStack Attr="Due:" Val="{Binding Path=Title, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Page}}"/> 
        </StackPanel> 
       </Expander> 
      </StackPanel> 

      <StackPanel Grid.Column="1"> 
       <cc:Playblast_Viewer x:Name="PlayblastView"/> 
       <cc:FeedbackCtrl Header="Feedback"/> 
       <cc:FeedbackCtrl Header="NoticeBoard"/> 
      </StackPanel> 

     </Grid> 
    </ScrollViewer> 
</Grid>

来源

2014-08-30 09:27:45 xxdefaultxx

链接依赖属性xaml wpf

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