【发布时间】：2014-10-09 09:35:36
【问题描述】：
我有一个 WPF 应用程序在我的 Windows 8 操作系统开发机器上运行，没有任何问题。但是当我尝试在 Windows 7 机器上运行相同的程序时，我收到了错误
System.InvalidOperationException：指定元素已经是另一个元素的逻辑子元素。先断开连接。
详细的错误日志是
[CDATA[Set property 'System.Windows.FrameworkElement.Style' threw an exception.
LoadBaml at offset 481 in file:line:column <filename unknown>:0:0
System.InvalidOperationException: Specified element is already the logical child of another element. Disconnect it first.
at System.Windows.FrameworkElement.ChangeLogicalParent(DependencyObject newParent)
at System.Windows.FrameworkElement.AddLogicalChild(Object child)
at System.Windows.Controls.ContentControl.OnContentChanged(Object oldContent, Object newContent)
at System.Windows.Controls.ContentControl.OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
at System.Windows.StyleHelper.ApplyStyleOrTemplateValue(FrameworkObject fo, DependencyProperty dp)
at System.Windows.StyleHelper.InvalidateContainerDependents(DependencyObject container, FrugalStructList`1& exclusionContainerDependents, FrugalStructList`1& oldContainerDependents, FrugalStructList`1& newContainerDependents)
at System.Windows.StyleHelper.DoStyleInvalidations(FrameworkElement fe, FrameworkContentElement fce, Style oldStyle, Style newStyle)
at System.Windows.StyleHelper.UpdateStyleCache(FrameworkElement fe, FrameworkContentElement fce, Style oldStyle, Style newStyle, Style& styleCache)
at System.Windows.FrameworkElement.OnStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
at System.Windows.Baml2006.WpfKnownMemberInvoker.SetValue(Object instance, Object value)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(XamlMember member, Object obj, Object value)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(Object inst, XamlMember property, Object value)]]
我不知道是哪个元素 XAML 或背后的代码导致了这个问题。任何帮助找出这个奇怪问题的原因？
终于能找到出错的原因了 我在应用程序中有一个 ToggleButton 样式，它像这样在 App.xaml 中定义
<Style x:Key="ONStateLabelLib" TargetType="Label">
<Setter Property="Background" Value="#A1A1A1"></Setter>
<Setter Property="Foreground" Value="Black"></Setter>
<Setter Property="Margin" Value="0"></Setter>
<Setter Property="Padding" Value="0"></Setter>
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Width" Value="45"></Setter>
<Setter Property="VerticalContentAlignment" Value="Center"></Setter>
<Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
<Setter Property="FontSize" Value="14"/>
<Setter Property="FontFamily" Value="Arial"/>
</Style>
<Style x:Key="OFFStateLabelLib" TargetType="Label">
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Margin" Value="0"></Setter>
<Setter Property="Padding" Value="0"></Setter>
<Setter Property="FontSize" Value="14"/>
<Setter Property="FontFamily" Value="Arial"/>
<Setter Property="FontWeight" Value="ExtraLight"/>
<Setter Property="Foreground" Value="#515151"></Setter>
<Setter Property="Background" Value="#393939"></Setter>
<Setter Property="Width" Value="45"></Setter>
<Setter Property="BorderBrush" Value="#A1A1A1"></Setter>
<Setter Property="BorderThickness" Value="2"></Setter>
<Setter Property="VerticalContentAlignment" Value="Center"></Setter>
<Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
</Style>
<Style x:Key="OnOffToggleStyleLib" TargetType="ToggleButton" >
<Setter Property="VerticalAlignment" Value="Center"></Setter>
<Setter Property="Width" Value="90"></Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<ContentPresenter VerticalAlignment="Center" />
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Transparent">
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Content">
<Setter.Value>
<DockPanel Margin="0">
<Label DockPanel.Dock="Left" Style="{StaticResource ResourceKey=ONStateLabelLib}" >YES</Label>
<Label Style="{StaticResource ResourceKey=OFFStateLabelLib}" >NO</Label>
</DockPanel>
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Content">
<Setter.Value>
<DockPanel Margin="0">
<Label DockPanel.Dock="Left" Style="{StaticResource ResourceKey=OFFStateLabelLib}">YES</Label>
<Label Style="{StaticResource ResourceKey=ONStateLabelLib}" >NO</Label>
</DockPanel>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
我在 2 页 Page1.xaml 和 Page2.xaml 中使用切换按钮，就像这样
<ToggleButton Margin="5" Grid.Row="0"
ToolTip="{Binding Path=localResource.reader_tooltip_settings_fullscreen,Source={StaticResource DbookLanguageManagerDynamic}}" Grid.Column="1"
Name="btn_fullScreen" Click="btn_fullScreen_Clicked"
Style="{StaticResource ResourceKey=OnOffToggleStyleLib}" />
应用程序首先加载 Page1.xaml 并在导航到 Page2.xaml 时遇到异常。
现在有人可以帮忙解决这个问题吗？
【问题讨论】：
-
在我看来，您正在设置一个属性，该属性在您的应用程序某处的样式中保存控件。您可以尝试设置
ContentTemplate，以防它是导致此错误的Content属性。至于问题的根源，该错误根本没有提供足够的信息让我们知道它的来源，因为它是一个编译的 XAML。无法在 W7 机器上调试？ -
在开发机器以外的机器上，确保你已经安装了所有的先决条件。此外，在该机器上安装 Visual Studio。然后尝试在该机器上运行您的 exe。现在，如果您遇到任何错误，那么您可以选择使用 Visual Studio 进行调试，我认为您可能会在很短的时间内发现该错误。祝你好运…………
-
是的，我能够在 Windows 7 机器上进行调试。但没有更多信息可用，例如哪个 xaml 导致它或错误行等
-
@Vishal 在客户端部署项目时要求客户安装 Visual Studio 是否是一种好方法？
-
不，这不是要求客户安装 Visual Studio 的好方法。但这应该是您的测试期，并在您的安装文件中提供一些程序集（dll），这样客户就不需要安装 Visual Studio。我不是任何专家，但您仍然应该等待其他回复。
标签： .net wpf xaml windows-runtime