WPF 基础知识：如何在 DataTrigger 中设置外部属性？

发布于 2024-07-21 00:47:35 字数 951 浏览 6 评论 0原文

我正试图让我的头脑围绕着 WPF 模型。

我有一个项目列表框。列表框内的项目是字符串标识符。这工作正常。我想要的是拥有它，以便当前选定的标识符项目可以在我的封闭控件的代码隐藏中访问：

我

<ListBox.ItemTemplate>
 <DataTemplate>
   <StackPanel Width="320">
    <Label Content="{Binding Path=ShortName}" Style="{StaticResource ListHeader}"/>
      <TextBlock TextWrapping="Wrap" Text="{Binding Path=Description}" Style="{StaticResource ListText}" />
   </StackPanel>
 </DataTemplate>
 </ListBox.ItemTemplate>

认为我应该添加类似的内容：

<DataTemplate.Triggers>
    <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBoxItem}},Path=IsSelected}" Value="True">
    <Setter Property="" TargetName="">
     <Setter.Value>

     </Setter.Value>
   </Setter>
 </DataTrigger>

但我不知道如何设置设置器来设置作为封闭控件（即外部世界）一部分的属性。我想我有这个倒退吗？

原文

I"m trying to get my head wrapped around the WPF model.

I have a list box of items. Inside the list box items are string identifiers. This works fine. What I want is to have it so that the identifier from the currently selected item is accessible in my code-behind for the enclosing control.

I have this:

<ListBox.ItemTemplate>
 <DataTemplate>
   <StackPanel Width="320">
    <Label Content="{Binding Path=ShortName}" Style="{StaticResource ListHeader}"/>
      <TextBlock TextWrapping="Wrap" Text="{Binding Path=Description}" Style="{StaticResource ListText}" />
   </StackPanel>
 </DataTemplate>
 </ListBox.ItemTemplate>

And I think I should add something like:

<DataTemplate.Triggers>
    <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBoxItem}},Path=IsSelected}" Value="True">
    <Setter Property="" TargetName="">
     <Setter.Value>

     </Setter.Value>
   </Setter>
 </DataTrigger>

But I'm lost as to how to set-up the setter to set a property that's part of the enclosing control (ie, the outside world). I think I have this backwards somehow?

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尝蛊 2024-07-28 00:47:36

如果您尝试从列表框外部访问选定列表框项目上的属性，那么您可以在后面的代码中执行以下操作：

CustomItem item = (CustomItem)listBox1.SelectedItem;
MessageBox.Show(item.ShortName);

并且您的 xaml 如下所示：

<ListBox Height="100" Name="listBox1">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Name="stackPanel1">
                    <Label Content="{Binding Path=Shortname}"/>
                    <TextBlock Text="{Binding Path=Description}"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

您只需将选定项目从列表框转换为对象类型，然后访问对象的属性。

希望这就是您所追求的。

If you are trying to access a property on a selected list box item from outside of the listbox then you can do the following in your code behind:

CustomItem item = (CustomItem)listBox1.SelectedItem;
MessageBox.Show(item.ShortName);

And your xaml is as follows:

<ListBox Height="100" Name="listBox1">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Name="stackPanel1">
                    <Label Content="{Binding Path=Shortname}"/>
                    <TextBlock Text="{Binding Path=Description}"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

You just cast the selecteditem from the listbox to your object type, then access the property on the object.

Hope this is what you were after.

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