WPF Change Background color of a Combobox
Try this
<Window.Resources> //Put this resourse n Window.Resources or UserControl.Resources
<LinearGradientBrush x:Key="NormalBrush" StartPoint="0,0" EndPoint="0,1">
<GradientBrush.GradientStops>
<GradientStopCollection>
<GradientStop Color="#FFDC3939" Offset="0.0"/>
<GradientStop Color="#FFE80E0E" Offset="1.0"/>
</GradientStopCollection>
</GradientBrush.GradientStops>
</LinearGradientBrush>
<SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFFBE618" />
<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}"
BorderThickness="1" />
<Border
Grid.Column="0"
CornerRadius="2,0,0,2"
Margin="1"
Background="{StaticResource WindowBackgroundBrush}"
BorderThickness="0,0,1,0" />
<Path
x:Name="Arrow"
Grid.Column="1"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 4 4 L 8 0 Z"/>
</Grid>
</ControlTemplate>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
<Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
</ControlTemplate>
<Style x:Key="{x:Type ComboBox}" TargetType="ComboBox">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<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"
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"/>
<ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<ComboBox HorizontalAlignment="Left" Margin="256,57,0,0" VerticalAlignment="Top" Width="120">
</ComboBox>
</Grid>
Here is the complete style that you can change : http://msdn.microsoft.com/en-us/library/ms752094%28v=VS.85%29.aspx
Why isnt my Background color working in a ComboBox
Your code should work as expected while using wpf with windows 7. However if you are running windows 8 or later, the same may not apply.
This https://blog.magnusmontin.net/2014/04/30/changing-the-background-colour-of-a-combobox-in-wpf-on-windows-8/ might help you in achieving what you want.
The author has given a very good explanation regarding the same.
Trying to set the Background of a combobox in WPF
I ran in to this issue a year ago, it has to do with WPF using OS Windows styles for the combo box regardless of your background color. To get around this you need to completely define the combobox style. I created this combobox style which would need tweaking but could give you an idea.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush x:Key="ComboBoxNormalBorderBrush" Color="#e3e9ef" />
<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="16" />
</Grid.ColumnDefinitions>
<Border Grid.ColumnSpan="2" Name="Border" BorderBrush="Transparent" CornerRadius="0" BorderThickness="1, 1, 1, 1" Background="Transparent" />
<Border Grid.Column="1" Margin="1, 1, 1, 1" BorderBrush="#444" Name="ButtonBorder" CornerRadius="0, 0, 0, 0" BorderThickness="0, 0, 0, 0" Background="Blue" />
<Path x:Name="Arrow" Grid.Column="1" HorizontalAlignment="Center" Margin="1,-1,0,0" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z" Fill="#FFDDDDDD"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="UIElement.IsMouseOver" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="#FF4444FF"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="White" />
</Trigger>
<Trigger Property="UIElement.IsMouseOver" Value="False">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="Blue"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="White" />
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="WhiteSmoke"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#FF8D979E"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="Panel.Background" TargetName="Border" Value="#eee"/>
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="#eee"/>
<Setter Property="Border.BorderBrush" TargetName="ButtonBorder" Value="#888"/>
<Setter Property="TextElement.Foreground" Value="#888"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#999"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style x:Key="ComboBoxFlatStyle" 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="FrameworkElement.FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="PART_ToggleButton" Grid.Column="2" ClickMode="Press" Focusable="False" 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" 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="Stretch" VerticalAlignment="Center" Focusable="True" >
<TextBox.Template>
<ControlTemplate TargetType="TextBox" >
<Border Name="PART_ContentHost" Focusable="False" />
</ControlTemplate>
</TextBox.Template>
</TextBox>
<Border Name="OutlineBoder" BorderBrush="LightBlue" IsHitTestVisible="False" />
<!-- Popup showing items -->
<Popup Name="PART_Popup" Placement="Bottom" Focusable="False" AllowsTransparency="True" IsOpen="{TemplateBinding ComboBox.IsDropDownOpen}" PopupAnimation="Slide">
<Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding FrameworkElement.ActualWidth}" MaxHeight="{TemplateBinding ComboBox.MaxDropDownHeight}">
<Border Name="DropDownBorder" Background="White" Margin="0, 1, 0, 0" CornerRadius="0" BorderThickness="1,1,1,1" BorderBrush="{StaticResource ComboBoxNormalBorderBrush}"/>
<ScrollViewer Margin="4" SnapsToDevicePixels="True">
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" TargetName="PART_ToggleButton" Value="LightBlue" />
</Trigger>
<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="#888"/>
</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>
How change the background color of the dropdown panel of Combobox
What you are seeing is a missing border color of the container. Set the BorderBrush value to the Blue for what is needed by the ItemContainerStyle to remove the White looking border.
Change background colour of a ComboBox in WPF without pasting entire template?
I am afraid you cannot "override" only a part of a ControlTemplate and given the way the default ControlTemplate of the ComboBox is defined, you cannot simply set or property or create a derived style with a trigger to change the background colour of it. This is explained in detail here.
What you can do is to change the background of the loaded template element at runtime programmtically:
private void ComboBox_Loaded(object sender, RoutedEventArgs e)
{
ComboBox comboBox = (ComboBox)sender;
ToggleButton toggleButton = comboBox.Template.FindName("toggleButton", comboBox) as ToggleButton;
if (toggleButton != null)
{
Border border = toggleButton.Template.FindName("templateRoot", toggleButton) as Border;
if (border != null)
border.Background = Brushes.Yellow;
}
}
XAML:
<ComboBox Loaded="ComboBox_Loaded">
<ComboBoxItem Background="Yellow">1</ComboBoxItem>
<ComboBoxItem Background="Yellow">2</ComboBoxItem>
<ComboBoxItem Background="Yellow">3</ComboBoxItem>
</ComboBox>
The other option is to copy the entire template into your XAML markup and edit it as per your requirements.
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