C# 装订不'；似乎无法在自定义数据模板（扩展器）中工作
概述 我正在尝试创建一个自定义扩展器，其中包含一个可视化树，用户可以在其中选择或取消选择节点。但这棵树现在并不重要。重要的是我必须覆盖的标题，以便显示用户需要的所有信息 问题C# 装订不'；似乎无法在自定义数据模板（扩展器）中工作,c#,wpf,xaml,binding,datatemplate,C#,Wpf,Xaml,Binding,Datatemplate,概述 我正在尝试创建一个自定义扩展器，其中包含一个可视化树，用户可以在其中选择或取消选择节点。但这棵树现在并不重要。重要的是我必须覆盖的标题，以便显示用户需要的所有信息 问题 <UserControl x:Class="WPF_Test_project.CheckableTree" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="htt
<UserControl x:Class="WPF_Test_project.CheckableTree"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<Grid>
<Grid.Resources>
<ResourceDictionary>
<ControlTemplate x:Key="ExpanderToggleButton" TargetType="ToggleButton">
<Path Name="Chevron"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 10 10 L 20 0 Z"
Fill="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Foreground}"
/>
<!-- Change appearance when is expanded -->
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter TargetName="Chevron" Property="Data" Value="M 0 10 L 10 0 L 20 10 Z" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style x:Key="MainViewExpander" TargetType="Expander">
<Setter Property="Foreground" Value="Black" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Expander">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Name="ContentRow" Height="0" />
</Grid.RowDefinitions>
<Border Name="HeaderBorder"
Grid.Row="0"
BorderThickness="0"
Background="#FFE1E1E1"
>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<ContentPresenter
Grid.Column="0"
Margin="0"
ContentSource="Header"
RecognizesAccessKey="True"
/>
<ToggleButton
Grid.Column="2"
Margin="4 4 8 4"
IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
OverridesDefaultStyle="True"
Template="{StaticResource ExpanderToggleButton}"
Background="Black"
/>
</Grid>
</Border>
<Border Name="ContentBorder" Grid.Row="1" BorderThickness="0">
<ContentPresenter Margin="0" />
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="True">
<Setter TargetName="ContentRow" Property="Height" Value="{Binding ElementName=Content, Path=DesiredHeight}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0"
Margin="4"
/>
<TextBlock Grid.Column="1"
Margin="2"
Text="{Binding ElementName=CT, Path=Header, FallbackValue=Header}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
/>
<TextBlock Grid.Column="2"
Margin="2"
Text="{Binding ElementName=CT, Path=NrOfFeaturesSelected, FallbackValue=5}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
<TextBlock Grid.Column="3"
Margin="2"
Text="/"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
<TextBlock Grid.Column="4"
Margin="2"
Text="{Binding ElementName=CT, Path=NrOfFeaturesAvailable, FallbackValue=5}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="{Binding IsExpanded}" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ResourceDictionary>
</Grid.Resources>
<Expander IsExpanded="True" Style="{StaticResource MainViewExpander}">
<TreeView ItemsSource="{Binding ElementName=CT, Path=Items}"
BorderThickness="0"
ItemContainerStyle="{StaticResource TreeViewItemStyle}"
Padding="4"
>
<TreeView.Resources>
<HierarchicalDataTemplate
x:Key="CheckableTreeItemTemplate"
ItemsSource="{Binding ElementName=CT, Path=Items}"
>
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0"
IsChecked="{Binding IsChecked}"
VerticalAlignment="Center"
Visibility="{Binding IsCheckable, Converter={StaticResource BooleanToVisibilityConverter}}"
/>
<Label Grid.Column="1"
Content="{Binding Title}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
/>
<Label Grid.Column="3"
Content="{Binding TagCountDisplayValue}"
HorizontalAlignment="Right"
VerticalAlignment="Center"
Visibility="{Binding ShowTagCountDisplayValue, Converter={StaticResource BooleanToVisibilityConverter}}"
/>
</Grid>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</Expander>
</Grid>
</UserControl>
<local:CheckableTree Header="Test" NrOfFeaturesSelected="9">
</local:CheckableTree>
<UserControl x:Class="WPF_Test_project.CheckableTree"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<Grid>
<Grid.Resources>
<ResourceDictionary>
<ControlTemplate x:Key="ExpanderToggleButton" TargetType="ToggleButton">
<Path Name="Chevron"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 10 10 L 20 0 Z"
Fill="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Foreground}"
/>
<!-- Change appearance when is expanded -->
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter TargetName="Chevron" Property="Data" Value="M 0 10 L 10 0 L 20 10 Z" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style x:Key="MainViewExpander" TargetType="Expander">
<Setter Property="Foreground" Value="Black" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Expander">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Name="ContentRow" Height="0" />
</Grid.RowDefinitions>
<Border Name="HeaderBorder"
Grid.Row="0"
BorderThickness="0"
Background="#FFE1E1E1"
>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<ContentPresenter
Grid.Column="0"
Margin="0"
ContentSource="Header"
RecognizesAccessKey="True"
/>
<ToggleButton
Grid.Column="2"
Margin="4 4 8 4"
IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
OverridesDefaultStyle="True"
Template="{StaticResource ExpanderToggleButton}"
Background="Black"
/>
</Grid>
</Border>
<Border Name="ContentBorder" Grid.Row="1" BorderThickness="0">
<ContentPresenter Margin="0" />
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="True">
<Setter TargetName="ContentRow" Property="Height" Value="{Binding ElementName=Content, Path=DesiredHeight}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0"
Margin="4"
/>
<TextBlock Grid.Column="1"
Margin="2"
Text="{Binding ElementName=CT, Path=Header, FallbackValue=Header}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
/>
<TextBlock Grid.Column="2"
Margin="2"
Text="{Binding ElementName=CT, Path=NrOfFeaturesSelected, FallbackValue=5}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
<TextBlock Grid.Column="3"
Margin="2"
Text="/"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
<TextBlock Grid.Column="4"
Margin="2"
Text="{Binding ElementName=CT, Path=NrOfFeaturesAvailable, FallbackValue=5}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="{Binding IsExpanded}" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ResourceDictionary>
</Grid.Resources>
<Expander IsExpanded="True" Style="{StaticResource MainViewExpander}">
<TreeView ItemsSource="{Binding ElementName=CT, Path=Items}"
BorderThickness="0"
ItemContainerStyle="{StaticResource TreeViewItemStyle}"
Padding="4"
>
<TreeView.Resources>
<HierarchicalDataTemplate
x:Key="CheckableTreeItemTemplate"
ItemsSource="{Binding ElementName=CT, Path=Items}"
>
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0"
IsChecked="{Binding IsChecked}"
VerticalAlignment="Center"
Visibility="{Binding IsCheckable, Converter={StaticResource BooleanToVisibilityConverter}}"
/>
<Label Grid.Column="1"
Content="{Binding Title}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
/>
<Label Grid.Column="3"
Content="{Binding TagCountDisplayValue}"
HorizontalAlignment="Right"
VerticalAlignment="Center"
Visibility="{Binding ShowTagCountDisplayValue, Converter={StaticResource BooleanToVisibilityConverter}}"
/>
</Grid>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</Expander>
</Grid>
</UserControl>
<local:CheckableTree Header="Test" NrOfFeaturesSelected="9">
</local:CheckableTree>
使用系统；
使用System.Collections.Generic；
使用System.Windows；
使用System.Windows.Controls；
命名空间WPF_测试_项目
{
///
///CheckableTree.xaml的交互逻辑
///
公共部分类CheckableTree:UserControl
{
公共可检查树（）
{
初始化组件（）；
}
已选择公共int nOffatures
{
获取{return（int）GetValue（nRoffeatureSelectedProperty）；}
set{SetValue（nRoffeatureSelectedProperty，value）；}
}
公共静态只读从属属性nOffertureSelectedProperty=
DependencyProperty.Register（“nOffertureSelected”、typeof（Int32）、typeof（CheckableTree）、new UIPropertyMetadata（null））；
公共设施可用
{
获取{return（int）GetValue（nRoffeatureSelectedProperty）；}
set{SetValue（nRoffeatureSelectedProperty，value）；}
}
公共静态只读从属属性nOffaturesAvailableProperty=
DependencyProperty.Register（“nOfferturesAvailable”、typeof（Int32）、typeof（CheckableTree）、new UIPropertyMetadata（null））；
公共数字项目
{
get{return（IEnumerable）GetValue（ItemsProperty）；}
set{SetValue（nRoffeatureSelectedProperty，value）；}
}
公共静态只读从属属性ItemsProperty=
Register（“Items”、typeof（IEnumerable）、typeof（CheckableTree）、new-UIPropertyMetadata（null））；
公共字符串头
{
get{return（string）GetValue（HeaderProperty）；}
set{SetValue（HeaderProperty，value）；}
}
公共静态只读从属属性HeaderProperty=
Register（“Header”、typeof（string）、typeof（CheckableTree）、newUIPropertyMetadata（null））；
}
}
<UserControl x:Class="WPF_Test_project.CheckableTree"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<Grid>
<Grid.Resources>
<ResourceDictionary>
<ControlTemplate x:Key="ExpanderToggleButton" TargetType="ToggleButton">
<Path Name="Chevron"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 10 10 L 20 0 Z"
Fill="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Foreground}"
/>
<!-- Change appearance when is expanded -->
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter TargetName="Chevron" Property="Data" Value="M 0 10 L 10 0 L 20 10 Z" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style x:Key="MainViewExpander" TargetType="Expander">
<Setter Property="Foreground" Value="Black" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Expander">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Name="ContentRow" Height="0" />
</Grid.RowDefinitions>
<Border Name="HeaderBorder"
Grid.Row="0"
BorderThickness="0"
Background="#FFE1E1E1"
>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<ContentPresenter
Grid.Column="0"
Margin="0"
ContentSource="Header"
RecognizesAccessKey="True"
/>
<ToggleButton
Grid.Column="2"
Margin="4 4 8 4"
IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
OverridesDefaultStyle="True"
Template="{StaticResource ExpanderToggleButton}"
Background="Black"
/>
</Grid>
</Border>
<Border Name="ContentBorder" Grid.Row="1" BorderThickness="0">
<ContentPresenter Margin="0" />
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="True">
<Setter TargetName="ContentRow" Property="Height" Value="{Binding ElementName=Content, Path=DesiredHeight}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0"
Margin="4"
/>
<TextBlock Grid.Column="1"
Margin="2"
Text="{Binding ElementName=CT, Path=Header, FallbackValue=Header}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
/>
<TextBlock Grid.Column="2"
Margin="2"
Text="{Binding ElementName=CT, Path=NrOfFeaturesSelected, FallbackValue=5}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
<TextBlock Grid.Column="3"
Margin="2"
Text="/"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
<TextBlock Grid.Column="4"
Margin="2"
Text="{Binding ElementName=CT, Path=NrOfFeaturesAvailable, FallbackValue=5}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
HorizontalAlignment="Right"
/>
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="{Binding IsExpanded}" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ResourceDictionary>
</Grid.Resources>
<Expander IsExpanded="True" Style="{StaticResource MainViewExpander}">
<TreeView ItemsSource="{Binding ElementName=CT, Path=Items}"
BorderThickness="0"
ItemContainerStyle="{StaticResource TreeViewItemStyle}"
Padding="4"
>
<TreeView.Resources>
<HierarchicalDataTemplate
x:Key="CheckableTreeItemTemplate"
ItemsSource="{Binding ElementName=CT, Path=Items}"
>
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0"
IsChecked="{Binding IsChecked}"
VerticalAlignment="Center"
Visibility="{Binding IsCheckable, Converter={StaticResource BooleanToVisibilityConverter}}"
/>
<Label Grid.Column="1"
Content="{Binding Title}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
/>
<Label Grid.Column="3"
Content="{Binding TagCountDisplayValue}"
HorizontalAlignment="Right"
VerticalAlignment="Center"
Visibility="{Binding ShowTagCountDisplayValue, Converter={StaticResource BooleanToVisibilityConverter}}"
/>
</Grid>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</Expander>
</Grid>
</UserControl>
<local:CheckableTree Header="Test" NrOfFeaturesSelected="9">
</local:CheckableTree>
<Textbox
...
Text={Binding Path=XY, RelativeSource={RelativeSource AncestorType=UserControl}, FallbackValue=...}"
... />
尝试使用{RelativeSource}
绑定到父UserControl
的头属性：
<TextBlock Grid.Column="1"
Margin="2"
Text="{Binding Path=Header, RelativeSource={RelativeSource AncestorType=UserControl}, FallbackValue=Header}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
/>
尝试使用{RelativeSource}
绑定到父UserControl
的头属性：
<TextBlock Grid.Column="1"
Margin="2"
Text="{Binding Path=Header, RelativeSource={RelativeSource AncestorType=UserControl}, FallbackValue=Header}"
Foreground="Black"
FontWeight="Bold"
FontSize="14"
/>
先生，你是我的英雄先生，你是我的英雄