C# 如何为子属性在样式、Setter和HierarchycalDataTemplate上设置DataContext绑定?
如果我使用C# 如何为子属性在样式、Setter和HierarchycalDataTemplate上设置DataContext绑定?,c#,wpf,mvvm,binding,C#,Wpf,Mvvm,Binding,如果我使用 public partial class MainWindow : Window { readonly TreeViewViewModel TreeView; public MainWindow() { //... this.DataContext = TreeView; } } 那么下面的XAML就可以正常工作了 <TreeView x:Name="radTreeView" Grid.Row="1"
public partial class MainWindow : Window
{
readonly TreeViewViewModel TreeView;
public MainWindow()
{
//...
this.DataContext = TreeView;
}
}
那么下面的XAML就可以正常工作了
<TreeView x:Name="radTreeView" Grid.Row="1"
Margin = "5,5,5,5"
ItemsSource = "{Binding FirstGeneration}"
Padding = "5"
ScrollViewer.HorizontalScrollBarVisibility = "Visible"
ScrollViewer.VerticalScrollBarVisibility = "Visible"
IsTextSearchEnabled="True" >
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem" >
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}" >
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay}" />
<TextBlock VerticalAlignment="Center" Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
我可以使用DataContext=“{binding MainViewModel.TreeView}”
使部分绑定工作,但这仅适用于主TreeView元素,而不适用于没有DataContext属性的Style、Setter、hierarchycaldatatemplate
如何正确设置所有XAML TreeView元素的数据上下文
下面是我迄今为止尝试过的内容,但只有ItemsSource=“{Binding FirstGeneration}”
使用正确的数据上下文
<TreeView x:Name="radTreeView" Grid.Row="1"
Margin = "5,5,5,5"
DataContext = "{Binding MainViewModel.TreeView}"
ItemsSource = "{Binding FirstGeneration}"
Padding = "5"
ScrollViewer.HorizontalScrollBarVisibility = "Visible"
ScrollViewer.VerticalScrollBarVisibility = "Visible"
IsTextSearchEnabled="True" >
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem" >
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}" >
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay}" />
<TextBlock VerticalAlignment="Center" Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
假设
radTreeView
的容器的DataContext
是MainViewModel
的一个实例,您可以执行以下操作
<TreeView ... DataContext="{Binding TreeView}" ItemsSource="{Binding FirstGeneration}">
我认为问题在于我试图同时在Treeview元素和子元素上设置DataContext。这是否意味着DataContext是层次化的,并且有一条通过父控件的路径?是的,
DataContext
沿可视化树向下继承,直到它将在XAML中手动更改,或者例如ItemsControl
将每个项目容器的DataContext
设置为列表的项目我的代码实际工作正常(doh!)-为了编写这个问题的简单性,我从复选框和文本框中删除了DataContext,现在它在代码中可以正常工作。dkozl的回答帮助dugug解决了这个问题。
<TreeView ... DataContext="{Binding TreeView}" ItemsSource="{Binding FirstGeneration}">
<TreeView ... ItemsSource="{Binding TreeView.FirstGeneration}">