Question

我创建了一个自定义窗口，其中包含在资源字典中定义的模板。 该窗口没有标题栏。

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:dsControls="clr-namespace:Something">
<Style x:Key="WindowRegionStyle"
       TargetType="Window">
    /** Other setters **/
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ContentControl">
                <Grid>
                    <Border Background="{StaticResource WindowBackground}"
                            BorderBrush="{StaticResource BorderBrushColor}"
                            BorderThickness="1"
                            CornerRadius="8"
                            HorizontalAlignment="Center"
                            VerticalAlignment="Center">
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>

                            <Border CornerRadius="8,8,0,0"
                                    BorderBrush="{StaticResource BorderBrushColor}"
                                    Background="{StaticResource HeaderColor}"
                                    Grid.ColumnSpan="2"
                                    Grid.Row="0">
                                <Label Content="{Binding Path=(dsControls:WindowDetails.Title), RelativeSource={RelativeSource TemplatedParent}}"
                                       FontSize="20" />
                            </Border>

                            <ContentPresenter Grid.Row="1" Grid.ColumnSpan="2" Content="{TemplateBinding Content}" />

                        </Grid>
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

添加到此模板的内容为UserControl。这一切都有效。

但现在我想在UserControl中定义一个标题。为了设置标题，我制作了attached property 'WindowDetails.Title'。

public static class WindowDetails
{
    public static string GetTitle(DependencyObject obj)
    {
        return (string)obj.GetValue(TitleProperty);
    }

    public static void SetTitle(DependencyObject obj, string value)
    {
        obj.SetValue(TitleProperty, value);
    }

    // Using a DependencyProperty as the backing store for Title.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty TitleProperty =
        DependencyProperty.RegisterAttached("Title", typeof(string), typeof(WindowDetails), new PropertyMetadata(""));

}

我在UserControl中设置了这样的标题：

<UserControl x:Class="Something.View"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:dsControls="clr-namespace:Something"
             Width="400"
             dsControls:WindowDetails.Title="Test">

      /** Some content **/
</UserControl>

问题

我无法将属性值绑定到template中的标签。

我已经尝试过（并且出错了）

<Label Content="{Binding Path=(dsControls:WindowDetails.Title), RelativeSource={RelativeSource TemplatedParent}}"
                                       FontSize="20" />

和

<Label Content="{Binding Path=(dsControls:WindowDetails.Title), RelativeSource={RelativeSource Self}}"
                                       FontSize="20" />

另外，更改OwnerType的{{1}}：

到 WindowDetails

public static readonly DependencyProperty TitleProperty = DependencyProperty.RegisterAttached（“Title”，typeof（string），typeof（WindowDetails），new PropertyMetadata（“”））;

当我这样做时，属性未设置。但Attached property的内容具有默认label。

到 UserControl

public static readonly DependencyProperty TitleProperty = DependencyProperty.RegisterAttached（“Title”，typeof（string），typeof（UserControl），new PropertyMetadata（“”））;

当我这样做时，属性已设置，但property value的内容没有值。

问题

如何在label中设置attached property并将其与我模板中UserControl的内容绑定？

提前致谢！

问候 Loetn

Answer 1

这是您可以执行此操作的方法：将x:Name提供给ContentPresenter并在绑定标签时引用它。

<Border CornerRadius="8,8,0,0"
   BorderBrush="{StaticResource BorderBrushColor}"
   Background="{StaticResource HeaderColor}"
   Grid.ColumnSpan="2"
   Grid.Row="0">
   <Label Content="{Binding Path=Content.(dsControls:WindowDetails.Title), ElementName="myPresenter"}" FontSize="20" />
</Border>
<ContentPresenter x:Name="myPresenter" Grid.Row="1" Grid.ColumnSpan="2" Content="{TemplateBinding Content}" />

Answer 2

尝试使用转换器

public class AttchedTitleToTitleConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (value as FrameworkElement).GetValue(WindowDetails.TitleProperty);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

将其添加到您的ResourceDictionary：

<local:AttchedTitleToTitleConverter x:Key="titleConverter"/>

在绑定中：

<Label Content="{Binding RelativeSource={RelativeSource Self}, Converter={DynamicResource titleConverter}}"/>

希望这有帮助

从contentpresenter中的内容获取附加属性值

2 个答案: