wpf 列表框：选定的项目未突出显示
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ListBox: Item selected is not highlighted
提问by David Shochet
In my WPF application, I have a simple listbox:
在我的 WPF 应用程序中，我有一个简单的列表框：
<ListBox x:Name="lbUtilities">
<ListBoxItem Tag="2" Content="One" IsSelected="True" />
<ListBoxItem Tag="5" Content="Two" />
</ListBox>
The problem is that when the ListBox appears first time, the selected item ("One") is not highlighted. If I click on any item, it gets highlighted. How could I have the selected by default item to be highlighted to the system color?
问题是当 ListBox 第一次出现时，所选项目（“一个”）没有突出显示。如果我单击任何项目，它就会突出显示。如何让默认选择的项目突出显示为系统颜色？
Thanks.
谢谢。
回答by paparazzo
It is selected but you need a hightlight for not focused
它已被选中，但您需要突出显示未聚焦
<ListBox Grid.Row="0" x:Name="lbUtilities">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Style.Triggers>
<Trigger Property="IsSelected" Value="True" >
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Foreground" Value="Black" />
</Trigger>
</Style.Triggers>
<Style.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Black"/>
<!-- Background of selected item when focussed -->
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="LightCyan"/>
<!-- Background of selected item when not focussed -->
<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="LightGray" />
</Style.Resources>
</Style>
</ListBox.ItemContainerStyle>
<ListBoxItem Tag="2" Content="One" IsSelected="True"/>
<ListBoxItem Tag="5" Content="Two" />
</ListBox>
回答by Nitesh
<Grid FocusManager.FocusedElement="{Binding ElementName=lbUtilities}">
<ListBox Name="lbUtilities" SelectedIndex="0" >
<ListBoxItem Content="One"></ListBoxItem>
<ListBoxItem Content="Two"></ListBoxItem>
</ListBox>
</Grid>
回答by Michel P.
I had a similar problem with the listview control where the selected item was highlighted only from user clicking on it, not from code behind such as:
我在 listview 控件中遇到了类似的问题，其中所选项目仅在用户单击时突出显示，而不是从后面的代码中突出显示，例如：
MyListView.SelectedItem = SomeObjectInItemsSource
I saw that the item was effectively selected but not highlighted as defined in my ItemContainerStyle. Then i tried something else:
我看到该项目已被有效选择，但未按照我的 ItemContainerStyle 中的定义突出显示。然后我尝试了别的东西：
With CType(MyListView.ItemsSource,IList)
.MyListView.SelectedIndex = .IndexOf(SomeObjectInItemsSource)
End With
then it started to work just as expected.
然后它开始按预期工作。
