我有一个扩展 WPF Datagrid 的自定义控件。在自定义控件内部，定义了网格的资源和控件模板
<DataGrid.Resources>
<local:VisibilityConverter x:Key="visibilityConverter" />
<Style x:Key="ColumnHeaderGripperStyle" TargetType="{x:Type Thumb}">
<Setter Property="Width" Value="8" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Cursor" Value="SizeWE" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Thumb}">
<Border Padding="{TemplateBinding Padding}" Background="{TemplateBinding Background}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--May need Commented if clashes with other Styles-->
<Style TargetType="{x:Type DataGridColumnHeader}" x:Key="DataGridColumnHeaderStyle">
<Setter Property="Foreground" Value="#FF000000" />
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="SeparatorBrush" Value="#FFC9CACA" />
<Setter Property="Padding" Value="4" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="DataGridColumnHeader">
<Grid x:Name="Root" Height="48">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="26" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="(Fill).Color" Duration="0" To="#FF448DCA" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[3].Color" Duration="0" To="#7FFFFFFF" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[2].Color" Duration="0" To="#CCFFFFFF" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[1].Color" Duration="0" To="#F2FFFFFF" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ColorAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="(Fill).Color" Duration="0" To="#FF448DCA" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[0].Color" Duration="0" To="#D8FFFFFF" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[1].Color" Duration="0" To="#C6FFFFFF" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[2].Color" Duration="0" To="#8CFFFFFF" />
<ColorAnimation Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Fill).(GradientStops)[3].Color" Duration="0" To="#3FFFFFFF" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SortStates">
<VisualState x:Name="Unsorted" />
<VisualState x:Name="SortAscending">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0" />
</Storyboard>
</VisualState>
<VisualState x:Name="SortDescending">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0" />
<DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="(RenderTransform).ScaleY" Duration="0" To="-.9" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="BackgroundRectangle" Grid.ColumnSpan="2" Fill="#FF1F3B53" Stretch="Fill" />
<Rectangle x:Name="BackgroundGradient" Grid.ColumnSpan="2" Stretch="Fill">
<Rectangle.Fill>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FCFFFFFF" Offset="0.015" />
<GradientStop Color="#F7FFFFFF" Offset="0.375" />
<GradientStop Color="#E5FFFFFF" Offset="0.6" />
<GradientStop Color="#D1FFFFFF" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Grid Grid.ColumnSpan="2" Margin="0,0,1,1">
<Border Margin="0,0,0,-1" Width="14" BorderBrush="#FF878787" BorderThickness="1,0,0,0" HorizontalAlignment="Right" Visibility="Collapsed">
<Path x:Name="DropDownIndicator" Height="5.26" Margin="0,2,0,0" Width="6.334" Data="F1 M-3.0081699E-07,0.010437 L4.0493598,6.9732699 L8.0546999,0 L-3.0081699E-07,0.010437 z" Fill="#FF444444" HorizontalAlignment="Center" RenderTransformOrigin=".5,.5" Stretch="Uniform" UseLayoutRounding="False" VerticalAlignment="Center">
<Path.RenderTransform>
<ScaleTransform ScaleX=".9" ScaleY=".9" />
</Path.RenderTransform>
</Path>
</Border>
</Grid>
<Grid Margin="4,2,9,2" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<local:ColumnOptionControl Height="13" Width="13" />
<!--Visibility="{Binding Path=CanUserGroup, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Converter={StaticResource visibilityConverter}}" />-->
<ContentPresenter Grid.Column="1" Content="{TemplateBinding Content}" />
<Path x:Name="SortIcon" Grid.Column="2" Margin="4,0,0,0" Width="8" Data="F1 M -5.215,6.099L 5.215,6.099L 0,0L -5.215,6.099 Z " Fill="#FF444444" HorizontalAlignment="Right" Opacity="0" RenderTransformOrigin=".5,.5" Stretch="Uniform" VerticalAlignment="Center">
<Path.RenderTransform>
<ScaleTransform ScaleX=".9" ScaleY=".9" />
</Path.RenderTransform>
</Path>
</Grid>
<Rectangle x:Name="VerticalSeparator" Grid.Column="1" Width="1" Fill="{TemplateBinding SeparatorBrush}" VerticalAlignment="Stretch" /> <!--Visibility="{TemplateBinding SeparatorVisibility}" />-->
<Border Grid.ColumnSpan="2" Grid.Row="1" Margin="0" BorderBrush="#FFC9CACA" BorderThickness="0,1,1,0" Visibility="{Binding Path=CanUserFilter, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Converter={StaticResource visibilityConverter}}">
<local:ColumnFilterControl Margin="0,0,0,1"/> <!--FilterVisibility="{Binding Path=CanUserFilter, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Converter={StaticResource visibilityConverter}}" />-->
</Border>
<Thumb Style="{StaticResource ColumnHeaderGripperStyle}" x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" />
<Thumb Style="{StaticResource ColumnHeaderGripperStyle}" x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DataGrid.Resources>
并且 VisibilityConverter 定义为
[ValueConversion(typeof(Visibility), typeof(bool))]
class VisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
bool? val = value as bool?;
if (val == null) val = false;
Visibility visible = (val == false ? Visibility.Collapsed : Visibility.Visible);
return visible;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
Visibility? visible = value as Visibility?;
if (visible == null) visible = Visibility.Collapsed;
bool val = (visible == Visibility.Collapsed || visible == Visibility.Hidden ? false : true);
return val;
}
}
在控件的使用中，当我尝试声明如下资源时，在以下声明中抛出运行时异常
'设置属性'System.Windows.ResourceDictionary.DeferrableContent' 引发异常。行号“368”和行位置“30”。
除了内部异常
{“无法重新初始化 ResourceDictionary 实例。”}
<local:EnhancedWPFDataGrid.Resources>
<Style TargetType="{x:Type DataGridCell}">
<EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown"></EventSetter>
</Style>
<uc:Settings x:Key="settings"/>
</local:EnhancedWPFDataGrid.Resources>
如果我在 xaml 的资源上方发表评论，它可以正常工作。
你能解释一下这有什么问题吗？
提前致谢。