WPF 中的数据绑定和触发器兼容性

发布于 2024-08-16 00:30:42 字数 915 浏览 5 评论 0原文

我有一个问题。我为 TreeView 制作了一个 DataTemplate，我需要设置 ToggleButton 的 IsChecked 属性的初始值取决于我的型号。但事实证明，使用触发器/设置器设置此属性会禁用数据绑定。

是这样吗？如果是，请给我一个如何解决的建议？

<DataTemplate x:Key="CellTemplate_Name">
   <DockPanel x:Name="dock">
      <ToggleButton x:Name="Expander"
        IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"> <--- Binding
    ...
      <ToggleButton/>
    ...
   <DataTemplate.Triggers>
      <DataTrigger Binding="{Binding Path=ObjIsOpened, Converter={StaticResource DebugConverter}}" Value="true"> <--- Trigger
         <Setter TargetName="Expander" Property="IsChecked" Value="true"></Setter>
      </DataTrigger>
                    ...
   </DataTemplate.Triggers>
</DataTemplate>

问候，莱拉克斯。

原文

I have a problem. I made a DataTemplate for a TreeView and I need to set the initial value of the ToggleButton's IsChecked property depending on my model. But it turns out that setting this property using triggers/setters disables the databinding.

Is it so? If yes, give me a suggestion how it can be fixed?

<DataTemplate x:Key="CellTemplate_Name">
   <DockPanel x:Name="dock">
      <ToggleButton x:Name="Expander"
        IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}"> <--- Binding
    ...
      <ToggleButton/>
    ...
   <DataTemplate.Triggers>
      <DataTrigger Binding="{Binding Path=ObjIsOpened, Converter={StaticResource DebugConverter}}" Value="true"> <--- Trigger
         <Setter TargetName="Expander" Property="IsChecked" Value="true"></Setter>
      </DataTrigger>
                    ...
   </DataTemplate.Triggers>
</DataTemplate>

Regards, Lerax.

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独守阴晴ぅ圆缺 2024-08-23 00:30:42

首先我建议你阅读 Josh Smith 的精彩文章
使用 ViewModel 模式简化 WPF TreeView

根据该文章，我会建议为 TreeViewItem 定义一个样式（使用 TreeView 的 ItemContainerStyle 属性），将其 IsExpanded 属性绑定到您的模型对象的 ObjIsOpened 属性。然后摆脱你的扳机。

例子：

<Style TargetType="TreeViewItem">
    <Setter Property="IsExpanded" 
        Value="{Binding ObjIsOpened, Converter={StaticResource DebugConverter}}"/>
</Style>

<DataTemplate x:Key="CellTemplate_Name">
   <DockPanel x:Name="dock">
      <ToggleButton x:Name="Expander"
        IsChecked="{Binding Path=IsExpanded, 
                       RelativeSource={RelativeSource 
                           AncestorType={x:Type TreeViewItem}}}"> <--- Binding
    ...
      <ToggleButton/>
    ...
</DataTemplate>

First of all I suggest you read the excellent article by Josh Smith
Simplifying the WPF TreeView by Using the ViewModel Pattern

Based on that article, I would suggest defining a style for the TreeViewItem (using the ItemContainerStyle property of the TreeView) which binds its IsExpanded property to your model object's ObjIsOpened property. Then get rid of your trigger.

Example:

<Style TargetType="TreeViewItem">
    <Setter Property="IsExpanded" 
        Value="{Binding ObjIsOpened, Converter={StaticResource DebugConverter}}"/>
</Style>

<DataTemplate x:Key="CellTemplate_Name">
   <DockPanel x:Name="dock">
      <ToggleButton x:Name="Expander"
        IsChecked="{Binding Path=IsExpanded, 
                       RelativeSource={RelativeSource 
                           AncestorType={x:Type TreeViewItem}}}"> <--- Binding
    ...
      <ToggleButton/>
    ...
</DataTemplate>

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