C# 更改组合框'；s验证样式WPF
在我的应用程序中，我有一个使用IDataErrorInfo接口验证的组合框 发生验证错误时，我希望组合框的背景更改为红色，而不是默认的红色边框 在上图中，我希望“月”组合框与验证错误上的其他控件一样具有红色背景。我已经通过文本框和使用样式触发器的IntegerUpDown控件实现了这种样式C# 更改组合框'；s验证样式WPF,c#,wpf,xaml,mvvm,combobox,C#,Wpf,Xaml,Mvvm,Combobox,在我的应用程序中，我有一个使用IDataErrorInfo接口验证的组合框 发生验证错误时，我希望组合框的背景更改为红色，而不是默认的红色边框 在上图中，我希望“月”组合框与验证错误上的其他控件一样具有红色背景。我已经通过文本框和使用样式触发器的IntegerUpDown控件实现了这种样式 <ControlTemplate.Triggers> <Trigger Property="Validation.HasError" Value="True"> &l
<ControlTemplate.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter TargetName="temp" Property="Background" Value="Red" />
</Trigger>
</ControlTemplate.Triggers>
<StackPanel>
<xctk:WatermarkComboBox x:Name="Month" ItemsSource="{Binding ListOfMonths}" SelectedItem="{Binding SelectedMonth, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Margin="0,0,20,0" Style="{DynamicResource WatermarkComboBoxStyle1}">
<xctk:WatermarkComboBox.Watermark>
<TextBlock Text="Month" Foreground="{StaticResource OffsetWhiteBrush}" />
</xctk:WatermarkComboBox.Watermark>
</xctk:WatermarkComboBox>
<Label Content="{Binding (Validation.Errors)[0].ErrorContent, ElementName=Month}" Foreground="Red" />
</StackPanel>
<!-- STYLINGS FOR THE COMBOBOX -->
<!-- Overrides the combo boxes items in the list -->
<Style x:Key="ComboBox" TargetType="{x:Type ComboBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBoxItem}">
<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="True">
<ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="{StaticResource LightGreyBrush}"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="{StaticResource BlueBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Watermark combo box style and template. -->
<Style x:Key="WatermarkComboBoxStyle1" TargetType="{x:Type xctk:WatermarkComboBox}">
<Setter Property="Foreground" Value="{StaticResource WhiteColorBrush}" />
<Setter Property="FontSize" Value="{StaticResource FontSize20}" />
<Setter Property="FontFamily" Value="{StaticResource LatoRegular}" />
<Setter Property="ItemContainerStyle" Value="{StaticResource ComboBox}" />
<Setter Property="MinWidth" Value="120" />
<Setter Property="MaxHeight" Value="30" />
<Setter Property="WatermarkTemplate">
<Setter.Value>
<DataTemplate>
<ContentControl Content="{Binding}" Foreground="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" Focusable="False">
</ContentControl>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type xctk:WatermarkComboBox}">
<Grid x:Name="templateRoot" SnapsToDevicePixels="True">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/>
</Grid.ColumnDefinitions>
<Popup x:Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Slide" Width="120">
<Grid x:Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border x:Name="DropDownBorder" Background="{StaticResource DarkGreyBrush}" />
<ScrollViewer SnapsToDevicePixels="True" Foreground="{StaticResource WhiteColorBrush}" FontFamily="{StaticResource LatoRegular}" FontSize="{StaticResource FontSize20}" VerticalAlignment="Center">
<StackPanel IsItemsHost="True" />
</ScrollViewer>
</Grid>
</Popup>
<ToggleButton x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}">
<ToggleButton.Style>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<!-- Setting the default dark grey background for the combo box
and trying to change the background to red when an IDataErrorInfo validation error has occurred, however, it does not change-->
<Border x:Name="templateRoot" SnapsToDevicePixels="True">
<Border.Style>
<Style TargetType="{x:Type Border}">
<Setter Property="Background" Value="{StaticResource DarkGreyBrush}" />
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="Background" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
<Border x:Name="splitBorder" BorderBrush="Transparent" BorderThickness="1" HorizontalAlignment="Right" Margin="0" SnapsToDevicePixels="True" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
<Path x:Name="Arrow" Grid.Column="1" Fill="{StaticResource WhiteColorBrush}" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z"/>
</Border>
</Border>
<!-- Control triggers to change the background of the combo box when it is pressed.
Also attempting to change the background of the ComboBox's background to red on a validation error however, it doesnt change-->
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding ElementName=toggleButton, Path=IsChecked}" Value="True">
<Setter Property="Background" TargetName="templateRoot" Value="{StaticResource LightGreyBrush}" />
</DataTrigger>
<Trigger Property="Validation.HasError" Value="True">
<Setter TargetName="templateRoot" Property="Background" Value="Red" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ToggleButton.Style>
</ToggleButton>
<ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="False" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
<TextBox x:Name="PART_EditableTextBox" Visibility="Hidden" />
<ContentPresenter x:Name="PART_WatermarkHost" ContentTemplate="{TemplateBinding WatermarkTemplate}" Content="{TemplateBinding Watermark}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="False" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding SelectedMonth}" Value="{x:Null}">
<Setter Property="Visibility" TargetName="PART_WatermarkHost" Value="Visible"/>
</DataTrigger>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="Background" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
尝试使用绑定到
验证的数据触发器。HasError
父水印组合框的附加属性
：
<DataTrigger Binding="{Binding (Validation.HasError),
RelativeSource={RelativeSource AncestorType=xctk:WatermarkComboBox}}" Value="True">
<Setter Property="Background" Value="Red" />
</DataTrigger>
...
<DataTrigger Binding="{Binding (Validation.HasError), RelativeSource={RelativeSource AncestorType=xctk:WatermarkComboBox}}"
Value="True">
<Setter TargetName="templateRoot" Property="Background" Value="Red" />
</DataTrigger>
...
请在您的问题中包含所有引用的资源，或将它们从示例标记中删除。谢谢，这正是我需要的！