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POSilverlight 2: XamlParseException in Silverlight 2
 

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  1. POSilverlight 2: XamlParseException in Silverlight 2
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    <p>I have the following problem that appears in Silverlight 2; in Silverlight 3 the same code works OK.</p> <p>The XAML code is the following:</p> <pre><code>&lt;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"&gt; &lt;UserControl.Resources&gt; &lt;ControlTemplate x:Key="TopicItem"&gt; &lt;Grid x:Name="TopicItemHost" ShowGridLines="False" Margin="0,8" VerticalAlignment="Stretch"&gt; &lt;vsm:VisualStateManager.VisualStateGroups&gt; &lt;vsm:VisualStateGroup x:Name="CommonStates"&gt; &lt;vsm:VisualState x:Name="Normal" /&gt; &lt;vsm:VisualState x:Name="MouseOver"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="hotRect" Storyboard.TargetProperty="Opacity" Duration="0" To="1" /&gt; &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetName="TopicItemHost" Storyboard.TargetProperty="Cursor" Duration="0"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0"&gt; &lt;DiscreteObjectKeyFrame.Value&gt; &lt;Cursors&gt;Hand&lt;/Cursors&gt; &lt;/DiscreteObjectKeyFrame.Value&gt; &lt;/DiscreteObjectKeyFrame&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;/vsm:VisualStateGroup&gt; &lt;vsm:VisualStateGroup x:Name="FocusStates"&gt; &lt;vsm:VisualState x:Name="Unfocused" /&gt; &lt;vsm:VisualState x:Name="Focused"&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="focusRect" Storyboard.TargetProperty="Opacity" Duration="0" To="1" /&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;/vsm:VisualStateGroup&gt; &lt;vsm:VisualStateGroup x:Name="ReadUnreadStates"&gt; &lt;vsm:VisualState x:Name="Read" /&gt; &lt;vsm:VisualState x:Name="Unread"&gt; &lt;Storyboard&gt; &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetName="TopicTitle" Storyboard.TargetProperty="FontWeight" Duration="0"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0"&gt; &lt;DiscreteObjectKeyFrame.Value&gt; &lt;FontWeight&gt;Bold&lt;/FontWeight&gt; &lt;/DiscreteObjectKeyFrame.Value&gt; &lt;/DiscreteObjectKeyFrame&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/vsm:VisualState&gt; &lt;/vsm:VisualStateGroup&gt; &lt;/vsm:VisualStateManager.VisualStateGroups&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto" MinWidth="10"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="*" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Rectangle x:Name="focusRect" Grid.Column="0" Grid.ColumnSpan="3" Grid.RowSpan="2" Fill="#F0F0F0" Margin="0,-8" Opacity="0"/&gt; &lt;Rectangle x:Name="hotRect" Grid.Column="1" Height="1" Margin="0,0,0,0" VerticalAlignment="Bottom" Opacity="0" &gt; &lt;Rectangle.Fill&gt; &lt;LinearGradientBrush StartPoint="0,0" EndPoint="1,0"&gt; &lt;GradientStop Color="#4080C0" Offset="0" /&gt; &lt;GradientStop Color="Gray" Offset="0.5" /&gt; &lt;GradientStop Color="White" Offset="1" /&gt; &lt;/LinearGradientBrush&gt; &lt;/Rectangle.Fill&gt; &lt;/Rectangle&gt; &lt;Image x:Name="TopicLock" Grid.Column="0" Visibility="Collapsed" Stretch="None" Source="Images/locked.png" Margin="10,2,10,0" VerticalAlignment="Top" /&gt; &lt;discussion:ThreadListItemTitleHost Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Stretch"&gt; &lt;discussion:TextCut x:Name="TopicTitle" Padding="0,0" Foreground="#4080C0" HorizontalAlignment="Left" VerticalAlignment="Top"/&gt; &lt;discussion:TextCut x:Name="TopicBody" Padding="4,0" VerticalAlignment="Top" HorizontalAlignment="Left" Foreground="Gray"/&gt; &lt;/discussion:ThreadListItemTitleHost&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="ProjectItem"&gt; &lt;TextBlock x:Name="Project" Padding="10,8" VerticalAlignment="Top" TextWrapping="Wrap"/&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="MessagesItem"&gt; &lt;TextBlock x:Name="Messages" Padding="10,8" VerticalAlignment="Top"/&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="AuthorItem"&gt; &lt;discussion:TextCut x:Name="Author" Padding="10,8" VerticalAlignment="Top" HorizontalAlignment="Stretch"/&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="DateItem"&gt; &lt;TextBlock x:Name="Date" Padding="10,8" VerticalAlignment="Top" /&gt; &lt;/ControlTemplate&gt; &lt;ControlTemplate x:Key="BottomBorder"&gt; &lt;Rectangle Width="Auto" Height="0.5" VerticalAlignment="Bottom" Stroke="Gray" StrokeThickness="0.5" /&gt; &lt;/ControlTemplate&gt; &lt;/UserControl.Resources&gt; </code></pre> <p></p> <p>So, there is a control named "TopicTitle" in the XAML. Class TextCut that implements the control contains property "FontWeight":</p> <pre><code>public static readonly DependencyProperty FontWeightProperty = DependencyProperty.RegisterAttached( "FontWeight", typeof(FontWeight), typeof(TextCut), new PropertyMetadata(new PropertyChangedCallback(OnFontWeightPropertyChanged))); </code></pre> <p>Then I call "VisualStateManager.GoToState(ctrl, "Unread", false)". This call should set value Bold into property "FontWeight" of the control "TopicTitle".</p> <p>On Silverlight 2.0 the following exception happens:</p> <p>XamlParseException: LineNumber: 0 LinePosition: 0 Message: "[Line:0 Position:0]" The call stack was: MS.Internal.XcpImports.CheckHResult(UInt32 hr) at MS.Internal.XcpImports.Storyboard_SeekAlignedToLastTick(Storyboard storyboard, Single seekTime) at System.Windows.Media.Animation.Storyboard.SeekAlignedToLastTick(TimeSpan offset) at System.Windows.VisualStateGroup.StartNewThenStopOld(FrameworkElement element, Storyboard[] newStoryboards) at System.Windows.VisualStateManager.GoToStateInternal(Control control, FrameworkElement element, VisualStateGroup group, VisualState state, Boolean useTransitions) at System.Windows.VisualStateManager.GoToState(Control control, String stateName, Boolean useTransitions)</p> <p>On Silverlight 3.0, as I said, there are no problems. The question is: what happens on Silverlight 2.0 and how can avoid this? What is the "[Line:0 Position:0]" - it tells nothing to me.</p>
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