我有一个绑定到DataSet的TreeView对象。在TreeView.ItemTemplate内部,我使用的是包含我正在渲染的控件的HierarchicalDataTemplate。
有没有人知道如何更改HierarchicalDataTemplate内部控件的Visibility属性?我尝试使用.NET框架中的BooleanToVisibilityConverter,但无法使绑定正常工作。
我的ViewModel中名为“ moveButtonVisibility ”的布尔变量绑定到我的XAML中按钮的Visibility属性。然后,BooleanToVisibilityConverter尝试将相应的布尔值(true / false)转换为Visibility值(可见/隐藏)。 “ moveButtonVisibility ”不是TreeView的ItemSource的一部分。
我的代码的精简版本如下所示。我已经删除了我的XAML中的所有代码,除了Button控件“MoveHereButton”我要更改可见性属性:
VIEWMODEL(C#):
private bool _moveButtonVisibility;
public bool moveButtonVisibility
{
get { return _moveButtonVisibility; }
set
{
_moveButtonVisibility = value;
RaiseChange("moveButtonVisibility");
}
}
查看(XAML):
<Page>
<Page.Resources>
<BooleanToVisibilityConverter x:Key="visibilityConverter"/>
</Page.Resources>
<Grid HorizontalAlignment="Center" VerticalAlignment="Top">
<TreeView HorizontalAlignment="Center" x:Name="treeView1" VerticalAlignment="Top" ItemsSource="{Binding Path=rsParentChild}" Background="Transparent" BorderThickness="0" BorderBrush="Transparent" >
<TreeView.ItemContainerStyle>
<Style>
<Setter Property="TreeViewItem.IsExpanded" Value="True"/>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Path=rsParentChild, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<Grid Focusable="False" Margin="5,10,5,10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
</Grid.RowDefinitions>
<Button Name="MoveHereButton" Content="Move Here" Visibility="{Binding DataContext.moveButtonVisibility, Converter={StaticResource visibilityConverter}}" Click="MoveHereButton_Click" />
</Grid>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
</Page>
答案 0 :(得分:1)
以下工作:
<Button Name="MoveHereButton"
Content="Move Here"
Visibility="{Binding DataContext.moveButtonVisibility,
RelativeSource={RelativeSource AncestorType={x:Type Page}},
Converter={StaticResource visibilityConverter}}"
Click="MoveHereButton_Click" />
关键是要添加:
RelativeSource={RelativeSource AncestorType={x:Type Page}}
在Visibility
绑定内部,强制控件使用DataContext
的{{1}}。