ViewModel 属性更改上的 WPF DataTrigger
当我的 ViewModel 中的属性发生更改时,我试图触发触发器。无论我如何尝试,我似乎都无法触发扳机。我的 XAML 看起来像这样:
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="Padding" Value="0 1" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsExpanding}" Value="True">
<Setter Property="Control.Template" Value="{StaticResource ResourceKey=loadingTreeViewItem}" />
</DataTrigger >
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</Style.Triggers>
</Style>
IsExpanded 和 IsSelected 绑定工作正常,但是当 IsExpanding 为 true 时,我无法触发 DataTrigger。这些属性位于同一个 ViewModel 中。我尝试为relativesource 添加不同的变体,但没有任何运气。如有任何反馈,我们将不胜感激。
I'm trying to fire a trigger when a property in my ViewModel changes. I can't seem to get the trigger to fire no matter what I try. My XAML looks like this:
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="Padding" Value="0 1" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsExpanding}" Value="True">
<Setter Property="Control.Template" Value="{StaticResource ResourceKey=loadingTreeViewItem}" />
</DataTrigger >
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</Style.Triggers>
</Style>
The IsExpanded and IsSelected bindings are working fine, however I can't get the DataTrigger to fire when IsExpanding is true. These properties are in the same ViewModel. I have tried adding different variations for RelativeSource but am not having any luck. Any feedback is appreciated.
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事实证明触发器起作用了。问题在于 IsExpanding 属性和获取 TreeView 数据的调用都发生在 UI 线程上。我通过线程调用来获取数据,一切都按预期工作
Turns out the trigger was working. The problem was that the IsExpanding property and the call to get the data for the TreeView were both happening on the UI thread. I threaded the call to get the data and everything is working as expected