我遇到以下Silverlight 2中出現的問題;在Silverlight 3中,相同的代碼工作正常。Silverlight 2:Silverlight 2中的XamlParseException
的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>
所以,有一個名爲 「TopicTitle」 中的XAML控制。類TextCut實現該控件包含屬性 「fontWeight設置」:
public static readonly DependencyProperty FontWeightProperty = DependencyProperty.RegisterAttached(
"FontWeight",
typeof(FontWeight),
typeof(TextCut),
new PropertyMetadata(new PropertyChangedCallback(OnFontWeightPropertyChanged)));
然後,我稱之爲 「VisualStateManager.GoToState(CTRL 」未讀「,FALSE)」。此調用應將值粗體設置爲控件「TopicTitle」的屬性「FontWeight」。
Silverlight的2.0以下例外情況:
XamlParseException: LineNumber上:0 LinePosition:0 消息: 「[行:0位置:0]」 調用堆棧是: MS.Internal。 XcpImports.CheckHResult(UInt32的小時) 在MS.Internal.XcpImports.Storyboard_SeekAlignedToLastTick(故事板故事板,一seekTime) 在System.Windows.Media.Animation.Storyboard.SeekAlignedToLastTick(時間跨度偏移) 在System.Windows.VisualStateGroup.StartNewThenStopOld( FrameworkElement元素,Storyboard [] newStoryboards) 在System.Windows.VisualStateManager.GoToStateInternal(控制控制,FrameworkElement的元件,VisualStateGroup基,的VisualState狀態,布爾useTransitions) 在System.Windows.VisualStateManager.GoToState(控制控制,字符串Statename的,布爾useTransitions)
Silverlight的3.0,正如我所說,沒有問題。問題是:Silverlight 2.0發生了什麼,以及如何避免這種情況?什麼是「[Line:0 Position:0]」 - 它沒有告訴我。
<FontWeight>Bold</FontWeight>
我敢肯定,你必須有很好的理由與SL2堅持,但 - :
謝謝你的回答。 ' Bold ' - 這可能是錯誤的?我嘗試將相同的代碼應用於TextBlock控件,而不是如果我的自定義控件 - 並且這起作用:文本變爲粗體。 –
KellyLynch
2010-03-06 09:52:57