我对WPF比较新，所以请耐心等待。
我尝试在获得焦点时设置组合框的背景颜色。我在控件模板中设置了一个触发器，以便它在togglebutton上改变鼠标悬停时的颜色，以及何时获得焦点。鼠标悬停工作正常，但当我进入组合框时，没有任何事情发生，直到我第二次选中它（然后它会改变颜色）。
所以我想要的是在用户第一次发布标签时更改背景颜色。
非常感谢任何帮助。
<SolidColorBrush x:Key="ComboBoxNormalBorderBrush" Color="Black" />
<SolidColorBrush x:Key="ComboBoxNormalBackgroundBrush" Color="#fff" />
<SolidColorBrush x:Key="ComboBoxDisabledForegroundBrush" Color="#888" />
<SolidColorBrush x:Key="ComboBoxDisabledBackgroundBrush" Color="#eee" />
<SolidColorBrush x:Key="ComboBoxDisabledBorderBrush" Color="#888" />
<ControlTemplate TargetType="ToggleButton" x:Key="ComboBoxToggleButtonTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border
Grid.ColumnSpan="2"
Name="Border"
BorderBrush="{StaticResource ComboBoxNormalBorderBrush}"
CornerRadius="0" BorderThickness="0.6"
Background="{StaticResource YellowBrush}">
</Border>
<Border
Grid.Column="1"
Margin="1"
BorderBrush="#444"
Name="ButtonBorder"
CornerRadius="0, 0, 0, 0"
BorderThickness="2"
Background="Gray" />
<Path Name="Arrow" Grid.Column="1"
Data="M0,0 L0,2 L4,6 L8,2 L8,0 L4,4 z"
HorizontalAlignment="Center" Fill="White"
VerticalAlignment="Center" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsMouseOver" Value="true">
<Setter TargetName="Border" Property="Background" Value="{StaticResource YellowBrush1}" />
</Trigger>
<Trigger Property="ToggleButton.IsFocused" Value="True">
<Setter TargetName="Border" Property="Background" Value="{StaticResource YellowBrush1}" />
</Trigger>
<Trigger Property="UIElement.IsMouseOver" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="DarkGray"/>
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="LightGray"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="Black"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="Panel.Background" TargetName="Border" Value="{StaticResource ComboBoxDisabledBackgroundBrush}"/>
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="{StaticResource ComboBoxDisabledBackgroundBrush}"/>
<Setter Property="Border.BorderBrush" TargetName="ButtonBorder" Value="{StaticResource ComboBoxDisabledBorderBrush}"/>
<Setter Property="TextElement.Foreground" Value="{StaticResource ComboBoxDisabledForegroundBrush}"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#999"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style TargetType="{x:Type ComboBox}">
<Setter Property="UIElement.SnapsToDevicePixels" Value="True"/>
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
<Setter Property="TextElement.Foreground" Value="Black"/>
<Setter Property="Height" Value="25"/>
<Setter Property="Margin" Value="0,0,0,4"/>
<Setter Property="BorderThickness" Value="2"/>
<Setter Property="IsEditable" Value="False"/>
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="FrameworkElement.FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Background" Value="{StaticResource NouvemYellowBrush}"/>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton"
ClickMode="Press"
Focusable="True"
IsChecked="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
Template="{StaticResource ComboBoxToggleButtonTemplate}"/>
<ContentPresenter Name="ContentSite" Margin="5, 3, 23, 3" IsHitTestVisible="False"
HorizontalAlignment="Left" VerticalAlignment="Center"
Focusable="False"
Content="{TemplateBinding ComboBox.SelectionBoxItem}"
ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"/>
<TextBox Name="PART_EditableTextBox" Margin="3, 3, 23, 3"
IsReadOnly="{TemplateBinding IsReadOnly}"
Visibility="Hidden" Background="Transparent"
HorizontalAlignment="Left" VerticalAlignment="Center"
Focusable="False">
<TextBox.Template>
<ControlTemplate TargetType="TextBox">
<Border Name="PART_ContentHost" Focusable="False"/>
</ControlTemplate>
</TextBox.Template>
</TextBox>
<!-- Popup showing items -->
<Popup Name="Popup"
Placement="Bottom"
Focusable="False"
AllowsTransparency="True"
IsOpen="{TemplateBinding ComboBox.IsDropDownOpen}"
PopupAnimation="Slide">
<Grid Name="DropDown" SnapsToDevicePixels="True"
MinWidth="{TemplateBinding FrameworkElement.ActualWidth}"
Focusable="False"
MaxHeight="{TemplateBinding ComboBox.MaxDropDownHeight}">
<Border Name="DropDownBorder"
Background="White"
Focusable="False"
Margin="0, 1, 0, 0"
CornerRadius="0"
BorderThickness="1"
BorderBrush="Black"/>
<ScrollViewer Margin="4" SnapsToDevicePixels="True" Focusable="False">
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" Focusable="False"/>
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter Property="FrameworkElement.MinHeight" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="{StaticResource ComboBoxDisabledForegroundBrush}"/>
</Trigger>
<Trigger Property="ItemsControl.IsGrouping" Value="True">
<Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
</Trigger>
<Trigger Property="ComboBox.IsEditable" Value="True">
<Setter Property="KeyboardNavigation.IsTabStop" Value="False"/>
<Setter Property="UIElement.Visibility" TargetName="PART_EditableTextBox" Value="Visible"/>
<Setter Property="UIElement.Visibility" TargetName="ContentSite" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
编辑：显示相关视图
<i:Interaction.Triggers>
<i:EventTrigger EventName="Loaded">
<command:EventToCommand Command="{Binding OnLoadingCommand}" PassEventArgsToCommand="True"/>
</i:EventTrigger>
<i:EventTrigger EventName="Unloaded">
<command:EventToCommand Command="{Binding OnClosingCommand}" PassEventArgsToCommand="True"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*"/>
<ColumnDefinition Width="11*"/>
<ColumnDefinition Width="14*"/>
<ColumnDefinition Width="14*"/>
<ColumnDefinition Width="14*"/>
<ColumnDefinition Width="14*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height=".2*"/>
<RowDefinition Height="3.5*"/>
<RowDefinition Height="8*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid x:Name="GridGlobalData" Grid.Row="1" Grid.ColumnSpan="6">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--left side-->
<Label Content="Code _________________________________________________________________________________________________________________"/>
<Label Content="Name _________________________________________________________________________________________________________________" Grid.Row="1"/>
<Label Content="Business Partner Type ________________________________________________________________________" Grid.Row="2"/>
<Label Content="Group _________________________________________________________________________________________________________________" Grid.Row="3"/>
<Label Content="Currency ___________________________________________________________________________________________________________" Grid.Row="4"/>
<TextBox x:Name="TextBoxCode" Text="{Binding PartnerCode, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1">
<TextBox.InputBindings>
<KeyBinding Command="{Binding ControlButtonCommand}" CommandParameter="Add" Key="A" Modifiers="Control" />
<KeyBinding Command="{Binding FindBusinessPartnerCommand}" CommandParameter="Code" Key="Enter"/>
</TextBox.InputBindings>
</TextBox>
<TextBox Text="{Binding PartnerName, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="1">
<TextBox.InputBindings>
<KeyBinding Command="{Binding FindBusinessPartnerCommand}" CommandParameter="Name" Key="Enter"/>
</TextBox.InputBindings>
</TextBox>
<ComboBox ItemsSource="{Binding BusinessPartnerTypes}" DisplayMemberPath="Type" SelectedItem="{Binding PartnerType}" SelectedIndex="0" Grid.Column="1" Grid.Row="2"/>
<ComboBox ItemsSource="{Binding BusinessPartnerGroups}" DisplayMemberPath="BPGroupName" SelectedItem="{Binding PartnerGroup}" SelectedIndex="0" Grid.Column="1" Grid.Row="3"/>
<ComboBox ItemsSource="{Binding BusinessPartnerCurrencies}" DisplayMemberPath="Name" SelectedItem="{Binding PartnerCurrency}" SelectedIndex="0" Grid.Column="1" Grid.Row="4"/>
<!--right side-->
<Label Content="Display Currency _________________________________________________________________________________________________________________" Grid.Column="3" />
<Label Content="Invoices _________________________________________________________________________________________________________________" Grid.Column="3" Grid.Row="1"/>
<Label Content="Deliveries _________________________________________________________________________________________________________________" Grid.Column="3" Grid.Row="2"/>
<Label Content="Orders _________________________________________________________________________________________________________________" Grid.Column="3" Grid.Row="3"/>
<ComboBox ItemsSource="{Binding BusinessPartnerCurrencies}" DisplayMemberPath="Name" SelectedItem="{Binding DisplayCurrency}" Style="{StaticResource StyleComboBoxReadonly}" SelectedIndex="0" Grid.Column="4"/>
<TextBox Style="{StaticResource StyleTextBoxNonEditable}" Grid.Column="4" Grid.Row="1"/>
<TextBox Style="{StaticResource StyleTextBoxNonEditable}" Grid.Column="4" Grid.Row="2"/>
<TextBox Style="{StaticResource StyleTextBoxNonEditable}" Grid.Column="4" Grid.Row="3"/>
</Grid>
<TabControl SelectedIndex="{Binding SelectedPartnerView}" Grid.Row="2" Grid.ColumnSpan="6" >
<TabItem Header="General">
<BusinessPartner:BPGeneralView />
</TabItem>
<TabItem Header="Contacts">
<BusinessPartner:BPContactView />
</TabItem>
<TabItem Header="Addresses">
<BusinessPartner:BPAddressesView />
</TabItem>
<TabItem Header="Payment Terms">
<BusinessPartner:BPPaymentTerms />
</TabItem>
<TabItem Header="Properties">
<BusinessPartner:BPPropertiesView />
</TabItem>
<TabItem Header="Remarks">
<BusinessPartner:BPRemarksView />
</TabItem>
<TabItem Header="Attachments">
<BusinessPartner:BPAttachmentsView />
</TabItem>
</TabControl>
<Grid x:Name="GridCrontrolButtons" Grid.Row="3" Grid.ColumnSpan="6">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="7*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<data:CrudView Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2"/>
</Grid>
</Grid>
答案 0 :(得分：0)
您应该可以通过在IsKeyboardFocused控件模板中的MouseOver和IsFocused触发器旁添加额外的ToggleButton触发器来实现此目的：
<Trigger Property="IsKeyboardFocused" Value="True">
<Setter TargetName="Border" Property="Background" Value="{StaticResource YellowBrush1}" />
</Trigger>
MSDN：https://msdn.microsoft.com/en-us/library/bb613567%28v=vs.110%29.aspx（向下滚动到IsKeyboardFocused部分）
更新：
在这种情况下，问题在于您在何处设置触发器。您依靠ToggleButton来获得焦点，以便您可以更改它的背景颜色 - 但实际上您希望组合框的内容具有焦点。
你必须 TAB 两次以显然实现焦点的原因是因为对于每个ComboBox你在控件的ToggleButton之间进行选项，然后是ComboBox选中的项目（通过ContentPresenter）。
一种可能的解决方法：首先，您需要阻止ComboBox模板中的ToggleButton获得焦点：
<ToggleButton Name="ToggleButton"
ClickMode="Press"
Focusable="False"
IsTabStop="False" ... >
我实际上已经从您的ToggleButton模板中删除了{strong>所有 Focusable="False"个设置者，因为他们不需要。
然后使您的ToggleButton模板透明（Border.Background），并删除影响Border.Background颜色的现有触发器。
现在转到您的ComboBox模板并为根<Grid>命名。我在我的例子中称它为templateRoot。
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid Name="templateRoot">
<ToggleButton Name="ToggleButton" ... >
现在使用templateRoot设置组合框的背景颜色。您可以将从ToggleButton模板中删除的触发器添加到ComboBox模板中：
<Trigger Property="IsKeyboardFocused" Value="True">
<Setter Property="Background" TargetName="templateRoot" Value="{StaticResource YellowBrush1}" />
</Trigger>
... and the other triggers.
通过这种方法，您可以依靠ComboBox控件在焦点有效时触发更改。
如果此解决方案无法满足您的需求，那么我希望至少您可以看到您所遇到的问题所在。
答案 1 :(得分：0)
您不需要为此编辑模板，只需要样式：
<ComboBox>
<ComboBoxItem>Apple</ComboBoxItem>
<ComboBoxItem>Banana</ComboBoxItem>
<ComboBoxItem>Pear</ComboBoxItem>
<ComboBox.Style>
<Style TargetType="{x:Type ComboBox}">
<Style.Triggers>
<Trigger Property="IsFocused" Value="True">
<Setter Property="Background" Value="Violet" />
</Trigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
</ComboBox>