RelativeSource 绑定 HierarchicalDataTemplate 与 collectionviewsource

Question

我已经实现了 TreeView 并在视图模型中使用绑定到 ObserableCollection 的 CollectionViewSource 填充了它。（代码如下）

谁能帮我理解如何将复选框 IsChecked 属性绑定到树视图第二层集合的 ViewModel 上的属性。

我正在尝试创建一种情况，如果子项目被选中，那么父节点也会被选中，反之亦然。

我认为主要问题是我不知道如何操作项目，除非它们在叶节点上，否则我无法访问父级中的项目集合..

还有一种方法可以绑定 CollectionViewSource 的源并使用要绑定的项目吗？

感谢任何提示或代码示例

CollectionViewSource

 <CollectionViewSource x:Key="CSV"
                              Source="{Binding TestApplications}">
            <CollectionViewSource.SortDescriptions>
                <scm:SortDescription PropertyName="BaseAppName" />
                <scm:SortDescription PropertyName="Category" />
                <scm:SortDescription PropertyName="AppName" />
            </CollectionViewSource.SortDescriptions>
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="BaseAppName" />
                <PropertyGroupDescription PropertyName="Category" />
            </CollectionViewSource.GroupDescriptions>

数据模板

 <DataTemplate x:Key="AppNameTemplate">
            <StackPanel Orientation="Horizontal">
                <CheckBox IsChecked="{Binding Path=IsChecked, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                          IsEnabled="True"
                          IsThreeState="False"
                          Name="btnChecked">

                <i:Interaction.Triggers>                    
                        <i:EventTrigger EventName="Checked">
                            <i:InvokeCommandAction    Command="{Binding RelativeSource= {RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path= DataContext.SelectedTestAppChangedCommand}"/>                      
                        </i:EventTrigger>
                        <i:EventTrigger EventName="Unchecked">
                            <i:InvokeCommandAction    Command="{Binding RelativeSource= {RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path= DataContext.SelectedTestAppChangedCommand2}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </CheckBox>

                <TextBlock Text="{Binding AppName}"
                           FontWeight="Bold">
                </TextBlock>
            </StackPanel>   
        </DataTemplate>

        <HierarchicalDataTemplate x:Key="CategoryTemplate"
                                  ItemsSource="{Binding Path=Items}"
                                  ItemTemplate="{StaticResource AppNameTemplate}">
            <StackPanel Orientation="Horizontal">
                <CheckBox IsChecked="{Binding RelativeSource= {RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeViewItem},AncestorLevel=2}, Path=IsChecked, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
                          IsEnabled="True"
                          IsThreeState="False"
                          Name="btnChecked">
                </CheckBox>

                <TextBlock Text="{Binding Name}"
                           FontStyle="Italic">
                </TextBlock>
            </StackPanel>
        </HierarchicalDataTemplate>

        <HierarchicalDataTemplate x:Key="BaseAppTemplate"
                                  ItemsSource="{Binding Path=Items}"
                                  ItemTemplate="{StaticResource CategoryTemplate}">
            <TextBlock Text="{Binding Name}" />
        </HierarchicalDataTemplate>

树视图

treeview 具有以下来源和模板：

ItemsSource="{Binding Source={StaticResource CSV}, Path=Groups}"
                                                         ItemTemplate="{StaticResource BaseAppTemplate}"

更多详情

ReadOnly Property TestApplications As ObservableCollection(Of ToolBaseModel)

** 基础模型**

Public Class ToolBaseModel
        Inherits NotificationObject
 Public Property Key As String
            Get
                Return mstrKey
            End Get
            Set(value As String)
                mstrKey = value
                Me.RaisePropertyChanged(Function() Me.AppName)
            End Set
        End Property

        Public Property Value As String
            Get
                Return mstrValue
            End Get
            Set(value As String)
                mstrValue = value
                Me.RaisePropertyChanged(Function() Me.Value)
            End Set
        End Property

        Public Property BaseAppName As String
            Get
                Return mstrConfgiFileName
            End Get
            Set(value As String)
                mstrConfgiFileName = value
                Me.RaisePropertyChanged(Function() Me.BaseAppName)
            End Set
        End Property

        Public Property Category As String
            Get
                Return mstrKey.Split(":"c).First
            End Get
            Set(value As String)
                mstrCategory = value
                Me.RaisePropertyChanged(Function() Me.Category)
            End Set
        End Property

        Public Property IsChecked() As Boolean
            Get
                Return mblnIsChecked
            End Get
            Set(ByVal value As Boolean)
                Me.RaisePropertyChanged(Function() Me.IsChecked)
            End Set
        End Property

        Public Property AppName As String
            Get
                Return mstrKey.Split(":"c)(1)
            End Get
            Set(value As String)
                mstrKey = value
                Me.RaisePropertyChanged(Function() Me.AppName)
            End Set
        End Property

        Public Property IsSelected() As Boolean
            Get
                Return mblnIsSelected
            End Get
            Set(ByVal value As Boolean)
                mblnIsSelected = value
                IsChecked = mblnIsSelected
                Me.RaisePropertyChanged(Function() Me.IsSelected)
            End Set
        End Property
EndClass

Answer 1

二级模板的绑定好像不太对

查看您的树的此表示：

--BaseAppTemplate

----CategoryTemplate {Binding ... AncestorLevel=2} 不好！

--------AppNameTemplate {Binding IsChecked} 好！

你看，AncestorLevel=n会向上查找绑定项的第n个父项。检查树结构，在 CategoryTemplate 之上没有 TreeViewItem 2 级别，因此绑定可能失败（尝试在输出 Windows 上调试那个）

好吧，那是你的 DataTemplate 上的一个错误，但我仍然不明白你想要完成什么，所以如果你能提供一个好的视觉样本（比如我画的那棵蹩脚的树）它会很棒。

RelativeSource 绑定 HierarchicalDataTemplate 与 collectionviewsource

RelativeSource binding HierarchicalDataTemplate with collectionviewsource

wpf

data-binding

observablecollection

collectionviewsource

hierarchicaldatatemplate