<ComboBox Grid.Column="1" Grid.Row="1" ItemsSource="{Binding Locations}" SelectedItem="{Binding SelectedLocation}" Margin="5" MinWidth="125">
<ComboBox.ItemContainerStyle>
<Style TargetType="{x:Type ComboBoxItem}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Background" Value="Red" />
<Setter Property="BorderBrush" Value="Red" />
<Setter Property="BorderThickness" Value="2" />
</Trigger>
</Style.Triggers>
</Style>
</ComboBox.ItemContainerStyle>
</ComboBox>
现在应用了边框，但背景颜色仍然是标准的 Windows 选择颜色，我该如何覆盖它？
你需要覆盖你的SystemColors.HighlightBrushKey覆盖默认的高亮画笔。将密钥添加到您的组合框资源中，如下所示 -
<ComboBox Grid.Column="1" Grid.Row="1" ItemsSource="{Binding Locations}" SelectedItem="{Binding SelectedLocation}" Margin="5" MinWidth="125">
<ComboBox.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Red"/>
</ComboBox.Resources>
<ComboBox.ItemContainerStyle>
<Style TargetType="{x:Type ComboBoxItem}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="BorderBrush" Value="Red" />
<Setter Property="BorderThickness" Value="2" />
</Trigger>
</Style.Triggers>
</Style>
</ComboBox.ItemContainerStyle>
</ComboBox>
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