我有一个自定义的ComboBox，它应该对某些依赖项属性的值做出反应。 （例如验证）。 现在，我只是无法找到如何在controltemplate的触发器中更改组合框控件的背景...我可以更改下拉菜单，但还没有找到如何更改整个控件的背景。依赖项属性设置正确，这是XAML：
<ControlTemplate x:Key="ComboBoxToggleButton" TargetType="ToggleButton">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border
x:Name="Border"
Grid.ColumnSpan="2"
CornerRadius="2"
Background="{StaticResource NormalBrush}"
BorderBrush="{StaticResource NormalBorderBrush}"
BorderThickness="1" />
<Border
Grid.Column="0"
CornerRadius="2,0,0,2"
Margin="1"
Background="{StaticResource WindowBackgroundBrush}"
BorderBrush="{StaticResource NormalBorderBrush}"
BorderThickness="0,0,1,0" />
<Path
x:Name="Arrow"
Grid.Column="1"
Fill="{StaticResource GlyphBrush}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 4 4 L 8 0 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsMouseOver" Value="true">
<Setter TargetName="Border" Property="Background" Value="{StaticResource DarkBrush}" />
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="true">
<Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" />
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" />
<Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBorderBrush}" />
<Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
<Setter TargetName="Arrow" Property="Fill" Value="{StaticResource DisabledForegroundBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
<Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
</ControlTemplate>
<Style x:Key="{x:Type local:ErgoDentComboBox}" TargetType="ComboBox" BasedOn="ComboBox">
<Setter Property="SnapsToDevicePixels" Value="true"/>
<!--<Setter Property="OverridesDefaultStyle" Value="true"/>-->
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="MinWidth" Value="120"/>
<Setter Property="MinHeight" Value="20"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:ErgoDentComboBox}">
<Grid>
<ToggleButton
Name="ToggleButton"
Template="{StaticResource ComboBoxToggleButton}"
Grid.Column="2"
Focusable="false"
IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press">
</ToggleButton>
<ContentPresenter
Name="ContentSite"
IsHitTestVisible="False"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
Margin="3,3,23,3"
VerticalAlignment="Center"
HorizontalAlignment="Left" />
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="3,3,23,3"
Focusable="True"
Background="Transparent"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}"/>
<Popup
Name="Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsDropDownOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Slide">
<Grid
Name="DropDown"
SnapsToDevicePixels="True"
MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border
x:Name="DropDownBorder"
Background="{StaticResource WindowBackgroundBrush}"
BorderThickness="1"
BorderBrush="{StaticResource SolidBorderBrush}"/>
<ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
<Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/>
<Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
</Trigger>
<Trigger Property="IsEditable"
Value="true">
<Setter Property="IsTabStop" Value="false"/>
<Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/>
<Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
</Trigger>
<!-- THIS ISN'T WORKING -->
<Trigger Property="IsValidationError" Value="False">
<Setter Property="BorderBrush" Value="DarkGreen" />
<Setter Property="Background" Value="Green" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
</Style.Triggers>
</Style>
在控件的代码中，我可以轻松设置背景，我将如何在触发器中执行此操作？
由于
丹尼
答案 0 :(得分：2)
我仍然对你真正想改变什么感到困惑。我假设它是ToggleButton背景。
由于ToggleButton有一个单独的ControlTemplate，如果你想将ComboBox模板触发器中的颜色传递给ToggleButton模板，我建议你使用TemplateBinding。相同的方法适用于更改边框颜色。
在您的ComboBox模板中：
<ToggleButton Name="ToggleButton" Template="{StaticResource ComboBoxToggleButton}"
Grid.Column="2" Focusable="false" ClickMode="Press"
IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
Background="{StaticResource WindowBackgroundBrush}"/> <!-- notice this line -->
<Trigger Property="IsValidationError" Value="False">
<Setter TargetName="DropDownBorder" Property="Background" Value="Yellow" /> <!-- changing dropdown background -->
<Setter TargetName="ToggleButton" Property="Background" Value="Yellow" /> <!-- changing togglebutton background -->
</Trigger>
在你的ToggleButton模板中：
<Border Grid.Column="0" CornerRadius="2,0,0,2" Margin="1"
BorderBrush="{StaticResource NormalBorderBrush}" BorderThickness="0,0,1,0"
Background="{TemplateBinding Background}" /> <!-- notice this line -->
答案 1 :(得分：0)
我认为您应该尝试为ContentSite设置Background属性（内容演示者，因为它是显示组合框内容的人）。否则，一个变通方法的想法 - 使用边框和设置包装内容展示器是bacground。
答案 2 :(得分：0)
Background属性只会更改WPF Combobox的编辑和拖放箭头区域。 要更改其他颜色，如弹出背景和突出显示颜色，您必须向资源字典添加一些画笔，映射到系统颜色：
var combo = new Combobox();
combo.Background = Brushes.Yellow;
combo.Foreground = Brushes.Blue;
combo.Resources.Add(SystemColors.WindowBrushKey, Brushes.Yellow);
combo.Resources.Add(SystemColors.HighlightBrushKey, Brushes.Red);
<Combobox Background="Yellow" Foreground="Blue">
<Combobox.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}" Color="Yellow" />
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Red" />
</Combobox.Resources>
</Combobox>
资源：[链接] http://www.codeproject.com/Tips/84637/TIP-Change-background-of-WPF-Combobox
答案 3 :(得分：0)
这就是我所做的......在你拥有“ContentPresenter”的地方，我用“边界”包裹了我，并为其分配了一个“名称”值，例如
<Border Name="presenterBorder"
Background="White"
BorderThickness="0"
BorderBrush="Transparent"
Margin="0"
Grid.Column="0" >
<ContentPresenter
Name="ContentSite"
IsHitTestVisible="False"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
Margin="3,3,23,3"
VerticalAlignment="Center"
HorizontalAlignment="Left" />
</Border>
然后，改变你的触发器...在我的情况下，由于我没有相同的属性，我只是通过“IsMouseOver”进行模拟。我改变了颜色，但关键的是“TargetName”。您想要更改名为“presenterBorder”的控件的背景和边框，该控件是您用文本内容演示者包装的边框。
<Trigger Property="IsMouseOver" Value="True" >
<Setter Property="BorderBrush" Value="Red" TargetName="presenterBorder" />
<Setter Property="Background" Value="Maroon" TargetName="presenterBorder" />
</Trigger>