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[英]XamlParseException when using ExpressionDark in Silverlight
[英]Silverlight 2: XamlParseException in Silverlight 2
我在Silverlight 2中出現以下問題; 在Silverlight 3中,相同的代碼可以正常工作。
XAML代碼如下:
<UserControl x:Class="My_Discussions.ThreadListItem"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
xmlns:discussion="clr-namespace:My_Discussions"
Width="Auto" Height="Auto">
<UserControl.Resources>
<ControlTemplate x:Key="TopicItem">
<Grid x:Name="TopicItemHost" ShowGridLines="False" Margin="0,8" VerticalAlignment="Stretch">
<vsm:VisualStateManager.VisualStateGroups>
<vsm:VisualStateGroup x:Name="CommonStates">
<vsm:VisualState x:Name="Normal" />
<vsm:VisualState x:Name="MouseOver">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="hotRect"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames
Storyboard.TargetName="TopicItemHost"
Storyboard.TargetProperty="Cursor"
Duration="0">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Cursors>Hand</Cursors>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</vsm:VisualState>
</vsm:VisualStateGroup>
<vsm:VisualStateGroup x:Name="FocusStates">
<vsm:VisualState x:Name="Unfocused" />
<vsm:VisualState x:Name="Focused">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="focusRect"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
</Storyboard>
</vsm:VisualState>
</vsm:VisualStateGroup>
<vsm:VisualStateGroup x:Name="ReadUnreadStates">
<vsm:VisualState x:Name="Read" />
<vsm:VisualState x:Name="Unread">
<Storyboard>
<ObjectAnimationUsingKeyFrames
Storyboard.TargetName="TopicTitle"
Storyboard.TargetProperty="FontWeight"
Duration="0">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<FontWeight>Bold</FontWeight>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</vsm:VisualState>
</vsm:VisualStateGroup>
</vsm:VisualStateManager.VisualStateGroups>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" MinWidth="10"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Rectangle x:Name="focusRect" Grid.Column="0" Grid.ColumnSpan="3" Grid.RowSpan="2" Fill="#F0F0F0" Margin="0,-8" Opacity="0"/>
<Rectangle x:Name="hotRect" Grid.Column="1" Height="1" Margin="0,0,0,0" VerticalAlignment="Bottom" Opacity="0"
>
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<GradientStop Color="#4080C0" Offset="0" />
<GradientStop Color="Gray" Offset="0.5" />
<GradientStop Color="White" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Image x:Name="TopicLock" Grid.Column="0" Visibility="Collapsed"
Stretch="None" Source="Images/locked.png" Margin="10,2,10,0"
VerticalAlignment="Top" />
<discussion:ThreadListItemTitleHost Grid.Column="1"
HorizontalAlignment="Left"
VerticalAlignment="Stretch">
<discussion:TextCut x:Name="TopicTitle"
Padding="0,0"
Foreground="#4080C0"
HorizontalAlignment="Left"
VerticalAlignment="Top"/>
<discussion:TextCut x:Name="TopicBody"
Padding="4,0"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Foreground="Gray"/>
</discussion:ThreadListItemTitleHost>
</Grid>
</ControlTemplate>
<ControlTemplate x:Key="ProjectItem">
<TextBlock x:Name="Project" Padding="10,8" VerticalAlignment="Top" TextWrapping="Wrap"/>
</ControlTemplate>
<ControlTemplate x:Key="MessagesItem">
<TextBlock x:Name="Messages" Padding="10,8" VerticalAlignment="Top"/>
</ControlTemplate>
<ControlTemplate x:Key="AuthorItem">
<discussion:TextCut x:Name="Author" Padding="10,8" VerticalAlignment="Top" HorizontalAlignment="Stretch"/>
</ControlTemplate>
<ControlTemplate x:Key="DateItem">
<TextBlock x:Name="Date" Padding="10,8" VerticalAlignment="Top" />
</ControlTemplate>
<ControlTemplate x:Key="BottomBorder">
<Rectangle Width="Auto" Height="0.5" VerticalAlignment="Bottom" Stroke="Gray" StrokeThickness="0.5" />
</ControlTemplate>
</UserControl.Resources>
因此,XAML中有一個名為“ TopicTitle”的控件。 實現控件的TextCut類包含屬性“ FontWeight”:
public static readonly DependencyProperty FontWeightProperty = DependencyProperty.RegisterAttached(
"FontWeight",
typeof(FontWeight),
typeof(TextCut),
new PropertyMetadata(new PropertyChangedCallback(OnFontWeightPropertyChanged)));
然后,我調用“ VisualStateManager.GoToState(ctrl,“未讀”,false)“。 該調用應將值Bold設置為控件“ TopicTitle”的屬性“ FontWeight”。
在Silverlight 2.0上,發生以下異常:
XamlParseException:LineNumber:0 LinePosition:0消息:“ [Line:0 Position:0]”調用堆棧為:MS.Internal.XcpImports.CheckHResult(UInt32 hr),位於MS.Internal.XcpImports.Storyboard_SeekAlignedToLastTick(Storyboard故事板,單個seekTime) )位於System.Windows.VisualStateGroup.StartNewThenStopOld(FrameworkElement元素,Storyboard [] newStoryboards)位於System.Windows.VisualStateManager.GoToStateInternal(控制控件,FrameworkElement元素,VisualStateGroup位於System.Windows.VisualStateGroup.StartNewThenStopOld(TimeSpan偏移) System.Windows.VisualStateManager.GoToState處的組,VisualState狀態,布爾useTransitions)(控制控件,字符串stateName,布爾useTransitions)
正如我所說,在Silverlight 3.0上沒有問題。 問題是:在Silverlight 2.0上會發生什么,如何避免這種情況? 什么是[[Line:0 Position:0]]-它對我無濟於事。
好吧,我對Silverlight 2的了解還很生銹,但是看着調用堆棧,我會說它對此感到不高興:-
<FontWeight>Bold</FontWeight>
我敢肯定,您一定有充分的理由堅持使用SL2,但我不禁指出,使用SL3可能是解決之道。
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