C# WPF BorderBrush не устанавливает цвет

У меня есть пограничная рамка, которая фактически не изменит цвет границы. Вот мой XAML для combobox. Есть идеи?C# WPF BorderBrush не устанавливает цвет

<ComboBox IsEditable="True" IsReadOnly="False" 
         Text="{Binding Model.Number}" ItemsSource="{Binding Item}" 
         SelectedItem="{Binding Model.Number}"  
         VerticalAlignment="Top" 
         BorderBrush="Red" 
         BorderThickness="2"> 
</ComboBox>

источник

2017-02-13 KrystianB

Вы должны изменить ControlTemplate в ComboBox для того, чтобы иметь возможность изменить свой цвет границы. Вы можете узнать больше о том, почему здесь: https://blog.magnusmontin.net/2014/04/30/changing-the-background-colour-of-a-combobox-in-wpf-on-windows-8/.

Вы можете скопировать шаблон по умолчанию в свою разметку XAML, щелкнув правой кнопкой мыши элемент ComboBox в режиме разработки в Visual Studio и выберите «Изменить шаблон» -> «Редактировать копию ...», а затем измените его как в соответствии с вашими требованиями.

Цитата много XAML, но вот оно. Найдите ресурс с именем «ComboBox.Static.Editable.Border» и измените свойство Color этого, чтобы изменить цвет рамки редактируемого ComboBox. Не забудьте добавить ссылку на PresentationFramework.Aero2.dll.

<Window x:Class="WpfApplication1.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero2" 
     mc:Ignorable="d" 
     Title="MainWindow" Height="300" Width="300"> 
    <Window.Resources> 
     <Style x:Key="FocusVisual"> 
      <Setter Property="Control.Template"> 
       <Setter.Value> 
        <ControlTemplate> 
         <Rectangle Margin="2" SnapsToDevicePixels="true" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
     <LinearGradientBrush x:Key="ComboBox.Static.Background" EndPoint="0,1" StartPoint="0,0"> 
      <GradientStop Color="#FFF0F0F0" Offset="0.0"/> 
      <GradientStop Color="#FFE5E5E5" Offset="1.0"/> 
     </LinearGradientBrush> 
     <SolidColorBrush x:Key="ComboBox.Static.Border" Color="#FFACACAC"/> 
     <SolidColorBrush x:Key="ComboBox.Static.Editable.Background" Color="#FFFFFFFF"/> 
     <SolidColorBrush x:Key="ComboBox.Static.Editable.Border" Color="Red"/> 
     <SolidColorBrush x:Key="ComboBox.Static.Editable.Button.Background" Color="Transparent"/> 
     <SolidColorBrush x:Key="ComboBox.Static.Editable.Button.Border" Color="Transparent"/> 
     <SolidColorBrush x:Key="ComboBox.MouseOver.Glyph" Color="#FF000000"/> 
     <LinearGradientBrush x:Key="ComboBox.MouseOver.Background" EndPoint="0,1" StartPoint="0,0"> 
      <GradientStop Color="#FFECF4FC" Offset="0.0"/> 
      <GradientStop Color="#FFDCECFC" Offset="1.0"/> 
     </LinearGradientBrush> 
     <SolidColorBrush x:Key="ComboBox.MouseOver.Border" Color="#FF7EB4EA"/> 
     <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Background" Color="#FFFFFFFF"/> 
     <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Border" Color="#FF7EB4EA"/> 
     <LinearGradientBrush x:Key="ComboBox.MouseOver.Editable.Button.Background" EndPoint="0,1" StartPoint="0,0"> 
      <GradientStop Color="#FFEBF4FC" Offset="0.0"/> 
      <GradientStop Color="#FFDCECFC" Offset="1.0"/> 
     </LinearGradientBrush> 
     <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Button.Border" Color="#FF7EB4EA"/> 
     <SolidColorBrush x:Key="ComboBox.Pressed.Glyph" Color="#FF000000"/> 
     <LinearGradientBrush x:Key="ComboBox.Pressed.Background" EndPoint="0,1" StartPoint="0,0"> 
      <GradientStop Color="#FFDAECFC" Offset="0.0"/> 
      <GradientStop Color="#FFC4E0FC" Offset="1.0"/> 
     </LinearGradientBrush> 
     <SolidColorBrush x:Key="ComboBox.Pressed.Border" Color="#FF569DE5"/> 
     <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Background" Color="#FFFFFFFF"/> 
     <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Border" Color="#FF569DE5"/> 
     <LinearGradientBrush x:Key="ComboBox.Pressed.Editable.Button.Background" EndPoint="0,1" StartPoint="0,0"> 
      <GradientStop Color="#FFDAEBFC" Offset="0.0"/> 
      <GradientStop Color="#FFC4E0FC" Offset="1.0"/> 
     </LinearGradientBrush> 
     <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Button.Border" Color="#FF569DE5"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Glyph" Color="#FFBFBFBF"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Background" Color="#FFF0F0F0"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Border" Color="#FFD9D9D9"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Background" Color="#FFFFFFFF"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Border" Color="#FFBFBFBF"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Button.Background" Color="Transparent"/> 
     <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Button.Border" Color="Transparent"/> 
     <SolidColorBrush x:Key="ComboBox.Static.Glyph" Color="#FF606060"/> 
     <Style x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}"> 
      <Setter Property="OverridesDefaultStyle" Value="true"/> 
      <Setter Property="IsTabStop" Value="false"/> 
      <Setter Property="Focusable" Value="false"/> 
      <Setter Property="ClickMode" Value="Press"/> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="{x:Type ToggleButton}"> 
         <Border x:Name="templateRoot" BorderBrush="{StaticResource ComboBox.Static.Border}" BorderThickness="{TemplateBinding BorderThickness}" Background="{StaticResource ComboBox.Static.Background}" SnapsToDevicePixels="true"> 
          <Border x:Name="splitBorder" BorderBrush="Transparent" BorderThickness="1" HorizontalAlignment="Right" Margin="0" SnapsToDevicePixels="true" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"> 
           <Path x:Name="arrow" Data="F1 M 0,0 L 2.667,2.66665 L 5.3334,0 L 5.3334,-1.78168 L 2.6667,0.88501 L0,-1.78168 L0,0 Z" Fill="{StaticResource ComboBox.Static.Glyph}" HorizontalAlignment="Center" Margin="0" VerticalAlignment="Center"/> 
          </Border> 
         </Border> 
         <ControlTemplate.Triggers> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/> 
            <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="false"/> 
            <Condition Binding="{Binding IsPressed, RelativeSource={RelativeSource Self}}" Value="false"/> 
            <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="true"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Static.Editable.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Static.Editable.Border}"/> 
           <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.Static.Editable.Button.Background}"/> 
           <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.Static.Editable.Button.Border}"/> 
          </MultiDataTrigger> 
          <Trigger Property="IsMouseOver" Value="true"> 
           <Setter Property="Fill" TargetName="arrow" Value="{StaticResource ComboBox.MouseOver.Glyph}"/> 
          </Trigger> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true"/> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="false"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Border}"/> 
          </MultiDataTrigger> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true"/> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Editable.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Editable.Border}"/> 
           <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.MouseOver.Editable.Button.Background}"/> 
           <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.MouseOver.Editable.Button.Border}"/> 
          </MultiDataTrigger> 
          <Trigger Property="IsPressed" Value="true"> 
           <Setter Property="Fill" TargetName="arrow" Value="{StaticResource ComboBox.Pressed.Glyph}"/> 
          </Trigger> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsPressed, RelativeSource={RelativeSource Self}}" Value="true"/> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="false"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Border}"/> 
          </MultiDataTrigger> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsPressed, RelativeSource={RelativeSource Self}}" Value="true"/> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Editable.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Editable.Border}"/> 
           <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.Pressed.Editable.Button.Background}"/> 
           <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.Pressed.Editable.Button.Border}"/> 
          </MultiDataTrigger> 
          <Trigger Property="IsEnabled" Value="false"> 
           <Setter Property="Fill" TargetName="arrow" Value="{StaticResource ComboBox.Disabled.Glyph}"/> 
          </Trigger> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="false"/> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="false"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Border}"/> 
          </MultiDataTrigger> 
          <MultiDataTrigger> 
           <MultiDataTrigger.Conditions> 
            <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="false"/> 
            <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/> 
           </MultiDataTrigger.Conditions> 
           <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Editable.Background}"/> 
           <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Editable.Border}"/> 
           <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.Disabled.Editable.Button.Background}"/> 
           <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.Disabled.Editable.Button.Border}"/> 
          </MultiDataTrigger> 
         </ControlTemplate.Triggers> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
     <ControlTemplate x:Key="ComboBoxTemplate" TargetType="{x:Type ComboBox}"> 
      <Grid x:Name="templateRoot" SnapsToDevicePixels="true"> 
       <Grid.ColumnDefinitions> 
        <ColumnDefinition Width="*"/> 
        <ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/> 
       </Grid.ColumnDefinitions> 
       <Popup x:Name="PART_Popup" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom"> 
        <Themes:SystemDropShadowChrome x:Name="shadow" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=templateRoot}"> 
         <Border x:Name="dropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"> 
          <ScrollViewer x:Name="DropDownScrollViewer"> 
           <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled"> 
            <Canvas x:Name="canvas" HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0"> 
             <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/> 
            </Canvas> 
            <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> 
           </Grid> 
          </ScrollViewer> 
         </Border> 
        </Themes:SystemDropShadowChrome> 
       </Popup> 
       <ToggleButton x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton}"/> 
       <ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> 
      </Grid> 
      <ControlTemplate.Triggers> 
       <Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true"> 
        <Setter Property="Margin" TargetName="shadow" Value="0,0,5,5"/> 
        <Setter Property="Color" TargetName="shadow" Value="#71000000"/> 
       </Trigger> 
       <Trigger Property="HasItems" Value="false"> 
        <Setter Property="Height" TargetName="dropDownBorder" Value="95"/> 
       </Trigger> 
       <MultiTrigger> 
        <MultiTrigger.Conditions> 
         <Condition Property="IsGrouping" Value="true"/> 
         <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/> 
        </MultiTrigger.Conditions> 
        <Setter Property="ScrollViewer.CanContentScroll" Value="false"/> 
       </MultiTrigger> 
       <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false"> 
        <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/> 
        <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/> 
       </Trigger> 
      </ControlTemplate.Triggers> 
     </ControlTemplate> 
     <SolidColorBrush x:Key="TextBox.Static.Background" Color="#FFFFFFFF"/> 
     <Style x:Key="ComboBoxEditableTextBox" TargetType="{x:Type TextBox}"> 
      <Setter Property="OverridesDefaultStyle" Value="true"/> 
      <Setter Property="AllowDrop" Value="true"/> 
      <Setter Property="MinWidth" Value="0"/> 
      <Setter Property="MinHeight" Value="0"/> 
      <Setter Property="FocusVisualStyle" Value="{x:Null}"/> 
      <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/> 
      <Setter Property="Stylus.IsFlicksEnabled" Value="False"/> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="{x:Type TextBox}"> 
         <ScrollViewer x:Name="PART_ContentHost" Background="Transparent" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 
     <ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="{x:Type ComboBox}"> 
      <Grid x:Name="templateRoot" SnapsToDevicePixels="true"> 
       <Grid.ColumnDefinitions> 
        <ColumnDefinition Width="*"/> 
        <ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/> 
       </Grid.ColumnDefinitions> 
       <Popup x:Name="PART_Popup" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom"> 
        <Themes:SystemDropShadowChrome x:Name="shadow" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=templateRoot}"> 
         <Border x:Name="dropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"> 
          <ScrollViewer x:Name="DropDownScrollViewer"> 
           <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled"> 
            <Canvas x:Name="canvas" HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0"> 
             <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/> 
            </Canvas> 
            <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> 
           </Grid> 
          </ScrollViewer> 
         </Border> 
        </Themes:SystemDropShadowChrome> 
       </Popup> 
       <ToggleButton x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton}"/> 
       <Border x:Name="border" Background="{StaticResource TextBox.Static.Background}" Margin="{TemplateBinding BorderThickness}"> 
        <TextBox x:Name="PART_EditableTextBox" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Margin="{TemplateBinding Padding}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/> 
       </Border> 
      </Grid> 
      <ControlTemplate.Triggers> 
       <Trigger Property="IsEnabled" Value="false"> 
        <Setter Property="Opacity" TargetName="border" Value="0.56"/> 
       </Trigger> 
       <Trigger Property="IsKeyboardFocusWithin" Value="true"> 
        <Setter Property="Foreground" Value="Black"/> 
       </Trigger> 
       <Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true"> 
        <Setter Property="Margin" TargetName="shadow" Value="0,0,5,5"/> 
        <Setter Property="Color" TargetName="shadow" Value="#71000000"/> 
       </Trigger> 
       <Trigger Property="HasItems" Value="false"> 
        <Setter Property="Height" TargetName="dropDownBorder" Value="95"/> 
       </Trigger> 
       <MultiTrigger> 
        <MultiTrigger.Conditions> 
         <Condition Property="IsGrouping" Value="true"/> 
         <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/> 
        </MultiTrigger.Conditions> 
        <Setter Property="ScrollViewer.CanContentScroll" Value="false"/> 
       </MultiTrigger> 
       <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false"> 
        <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/> 
        <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/> 
       </Trigger> 
      </ControlTemplate.Triggers> 
     </ControlTemplate> 
     <Style x:Key="ComboBoxStyle1" TargetType="{x:Type ComboBox}"> 
      <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/> 
      <Setter Property="Background" Value="{StaticResource ComboBox.Static.Background}"/> 
      <Setter Property="BorderBrush" Value="{StaticResource ComboBox.Static.Border}"/> 
      <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/> 
      <Setter Property="BorderThickness" Value="1"/> 
      <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/> 
      <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/> 
      <Setter Property="Padding" Value="6,3,5,3"/> 
      <Setter Property="ScrollViewer.CanContentScroll" Value="true"/> 
      <Setter Property="ScrollViewer.PanningMode" Value="Both"/> 
      <Setter Property="Stylus.IsFlicksEnabled" Value="False"/> 
      <Setter Property="Template" Value="{StaticResource ComboBoxTemplate}"/> 
      <Style.Triggers> 
       <Trigger Property="IsEditable" Value="true"> 
        <Setter Property="IsTabStop" Value="false"/> 
        <Setter Property="Padding" Value="2"/> 
        <Setter Property="Template" Value="{StaticResource ComboBoxEditableTemplate}"/> 
       </Trigger> 
      </Style.Triggers> 
     </Style> 
    </Window.Resources> 
    <Grid> 
     <ComboBox Style="{DynamicResource ComboBoxStyle1}" IsEditable="True" /> 
    </Grid> 
</Window>

Следует также отметить, что шаблон по умолчанию отличается от разных версий Windows. Вышеупомянутое относится к Windows 10.

И нет, нет способа изменить цвет границы, просто установив свойство или сделав что-то подобное :) Вы должны изменить шаблон.

источник

2017-02-13 14:02:43 mm8

Еще один хороший ответ исключал, чтобы избежать боли в изучении правильного пути. –

Если вам нужна красная рамка вокруг вашего ComboBox (или любого другого элемента управления), вы можете использовать Border.

<Border BorderBrush="Red" 
      BorderThickness="2"> 
    <ComboBox IsEditable="True" 
       IsReadOnly="False" 
       Text="{Binding Model.Number}" 
       ItemsSource="{Binding Item}" 
       SelectedItem="{Binding Model.Number}" 
       VerticalAlignment="Top"></ComboBox> 
</Border>

источник

2017-02-13 14:06:02 Mat

Использовать границу для каждого элемента управления в представлении и приложении - это ужасное решение. @ mm8 указал правильный ответ. –

В зависимости от ваших требований. Если вам просто нужно сделать красную рамку для одного ComboBox, вы не хотите иметь все служебные данные ControlTemplate. Если вы хотите изменить ALL ComboBoxes, дело будет иным, но OP, похоже, не попросит общий способ ... – Mat

Это добавляет * другую * границу * вокруг * ComboBox. Он не изменяет фактическую границу самого ComboBox. – mm8

C# WPF BorderBrush не устанавливает цвет

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