如何在silverlight TextBlock上显示验证错误
本文关键字：显示 验证 错误 TextBlock silverlight | 更新日期: 2023-09-27 18:30:11
我有一个表示XML文档的树。我展示了使用实现INotifyDataErrorInfo的绑定类的XML验证错误。
它在文本框或组合框等可编辑控件上运行良好。
但有些节点只是文本块。他们也有错误。
我该怎么做？
我建议您将TextBlock包装在ValidationErrorBorder:中
<ValidationErrorBorder DataContextValidationTargetPath="MyTextProperty">
<TextBlock Text="{Binding Path=MyTextProperty}"/>
</ValidationErrorBorder>
验证错误边境管制代码：
/*
* Use in conjuction with other Controls that do not have the appropriate
* visualStates to indicate ValidationErrors.
* Either set DataContextValidationTargetPath to have this
* ValidationErrorBorder show validation errors that occur at the targeted
* property of the DataContext
* or bind ValidationTarget to any target you wish to have this
* ValidationErrorBorder show validation errors occuring for the bound target.
*/
[TemplateVisualState(GroupName="ValidationStates", Name = "Valid")]
[TemplateVisualState(GroupName="ValidationStates", Name = "InvalidUnfocused")]
[TemplateVisualState(GroupName="ValidationStates", Name = "InvalidFocused")]
public class ValidationErrorBorder : ContentControl
{
public object ValidationTarget
{
get { return GetValue( ValidationTargetProperty ); }
set { SetValue( ValidationTargetProperty, value ); }
}
public static readonly DependencyProperty ValidationTargetProperty =
DependencyProperty.Register( "ValidationTarget", typeof( object ),
typeof( ValidationErrorBorder ), new PropertyMetadata( null ) );
public string DataContextValidationTargetPath
{
get
{
return (string) GetValue( DataContextValidationTargetPathProperty );
}
set { SetValue( DataContextValidationTargetPathProperty, value ); }
}
public static readonly DependencyProperty
DataContextValidationTargetPathProperty =
DependencyProperty.Register( "DataContextValidationTargetPath",
typeof( string ), typeof( ValidationErrorBorder ),
new PropertyMetadata( null, HandlePathChanged ) );
private static void HandlePathChanged(DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
((ValidationErrorBorder) d).HandlePathChanged();
}
private void HandlePathChanged()
{
if (DataContextValidationTargetPath != null)
SetBinding(ValidationTargetProperty,
new Binding(DataContextValidationTargetPath));
else
ClearValue( ValidationTargetProperty );
}
public ValidationErrorBorder()
{
DefaultStyleKey = typeof( ValidationErrorBorder );
}
}
控制模板：
<Style TargetType="controls:ValidationErrorBorder">
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="controls:ValidationErrorBorder">
<Grid x:Name="RootElement" Background="{x:Null}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="ValidationStates">
<VisualState x:Name="Valid"/>
<VisualState x:Name="InvalidUnfocused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="InvalidFocused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsOpen" Storyboard.TargetName="validationTooltip">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<system:Boolean>True</system:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid>
<ContentPresenter Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" />
<Border x:Name="ValidationErrorElement" BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1" Visibility="Collapsed">
<ToolTipService.ToolTip>
<ToolTip x:Name="validationTooltip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource ValidationToolTipTemplate}">
<ToolTip.Triggers>
<EventTrigger RoutedEvent="Canvas.Loaded">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsHitTestVisible" Storyboard.TargetName="validationTooltip">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<system:Boolean>True</system:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ToolTip.Triggers>
</ToolTip>
</ToolTipService.ToolTip>
<Grid Background="Transparent" HorizontalAlignment="Right" Height="12" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12">
<Path Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z" Fill="#FFDC000C" Margin="1,3,0,0"/>
<Path Data="M 0,0 L2,0 L 8,6 L8,8" Fill="#ffffff" Margin="1,3,0,0"/>
</Grid>
</Border>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
和validationTooltipTemplate:
<ControlTemplate x:Key="ValidationToolTipTemplate">
<Grid x:Name="Root" Margin="5,0" Opacity="0" RenderTransformOrigin="0,0">
<Grid.RenderTransform>
<TranslateTransform x:Name="xform" X="-25"/>
</Grid.RenderTransform>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="OpenStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
<VisualTransition GeneratedDuration="0:0:0.2" To="Open">
<Storyboard>
<DoubleAnimation Duration="0:0:0.2" To="0" Storyboard.TargetProperty="X" Storyboard.TargetName="xform">
<DoubleAnimation.EasingFunction>
<BackEase Amplitude=".3" EasingMode="EaseOut"/>
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
<DoubleAnimation Duration="0:0:0.2" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Root"/>
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="Closed">
<Storyboard>
<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Root"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Open">
<Storyboard>
<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="X" Storyboard.TargetName="xform"/>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="Root"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border Background="#052A2E31" CornerRadius="5" Margin="4,4,-4,-4"/>
<Border Background="#152A2E31" CornerRadius="4" Margin="3,3,-3,-3"/>
<Border Background="#252A2E31" CornerRadius="3" Margin="2,2,-2,-2"/>
<Border Background="#352A2E31" CornerRadius="2" Margin="1,1,-1,-1"/>
<Border Background="#FFDC000C" CornerRadius="2"/>
<Border CornerRadius="2">
<TextBlock Foreground="White" MaxWidth="250" Margin="8,4,8,4" TextWrapping="Wrap" Text="{Binding (Validation.Errors)[0].ErrorContent}" UseLayoutRounding="false"/>
</Border>
</Grid>
</ControlTemplate>
默认情况下，Silverlight并不真正支持它。在过去，我发现一种行之有效的方法是制作一个从Textblock继承的控件。然后，您可以处理IDatanotify接口和异常，并在此基础上关闭不同颜色的文本块。