使用带有TreeView控件的WPF XBAP应用程序。 Treeview具有自定义ItemContainerStyle并使用分层数据绑定。当我最小化运行XBAP的浏览器并再次最大化它并单击TreeView中的项目时，该项目未被选中，即。 SelectedItemChanged事件处理程序未触发。 下面是我用于TreeViewItem的样式：
<Style x:Key="TreeViewItemFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle Margin="0,0,0,0"
Opacity="0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Width" Value="10"/>
<Setter Property="Height" Value="10"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Image x:Name="imgExpand" Source="Images/plus.png"/>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Source" TargetName="imgExpand" Value="Images/minus.png"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="TreeViewItemStyle" TargetType="{x:Type TreeViewItem}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="Padding" Value="1,0,0,0"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="IsExpanded" Value="{Binding Path=IsItemExpanded}" />
<!--<Setter Property="IsSelected" Value="{Binding Path=IsEntitySelected}" />-->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid x:Name="grd">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Rectangle x:Name="HorLn" Height="1" Margin="10,0,0,0" RenderOptions.EdgeMode="Aliased" Stroke="White"
SnapsToDevicePixels="true" StrokeDashArray="1 2" StrokeThickness="1"/>
<Rectangle x:Name="VerLn" Width="1" Grid.RowSpan="2" RenderOptions.EdgeMode="Aliased" Stroke="White"
SnapsToDevicePixels="true" StrokeDashArray="1 2" StrokeThickness="1"/>
<ToggleButton x:Name="Expander" Style="{StaticResource ExpandCollapseToggleStyle}" ClickMode="Press"
IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"/>
<StackPanel Orientation="Horizontal" Grid.Column="1" >
<!--<Image Width="16" Height="16" Margin="0" Source="{Binding Path=ImageSource}" x:Name="imgFlag"/>-->
<Border x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Margin="0" Padding="0">
<ContentPresenter x:Name="PART_Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header"/>
</Border>
</StackPanel>
<ItemsPresenter x:Name="ItemsHost" Grid.Column="1" Grid.Row="1"/>
</Grid>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Converter={x:Static converters:TreeViewLineConverter.Instance}}" Value="true">
<Setter TargetName="VerLn"
Property="Height"
Value="1"/>
<Setter TargetName="VerLn"
Property="VerticalAlignment"
Value="Top"/>
</DataTrigger>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" TargetName="Bd" Value="#71a3ff"/>
<Setter Property="Control.Foreground" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
</Trigger>
<Trigger Property="IsFocused" Value="True">
<Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsSelectionActive" Value="true"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="#71a3ff"/>
<Setter Property="Control.Foreground" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsSelectionActive" Value="false"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="#71a3ff"/>
<Setter Property="Control.Foreground" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="VirtualizingStackPanel.IsVirtualizing" Value="true">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel/>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
感谢您提前提供任何帮助。
答案 0 :(得分：0)
免责声明：这只是一个有根据的猜测
在Window类中，只要删除焦点或将焦点返回到Deactivated对象，就会调用Activated和Window个事件。 如果您的XBAP顶级Window对象中有类似事件，则可能能够使用它们。 [对不起，但MSDN目前已关闭，所以我无法验证这是否正确。]
如果您可以附加到Activated事件，那么每次重新关注应用程序时，您都可以刷新UI以恢复其全部功能。