如果你想要 Style 的 SolidColorBrush 应用于所有 ComboBox ，然后将其移动到 Style.Resources 部分：

If you want the SolidColorBrush to apply to all of the ComboBoxes affected by your Style, then just move it to your Style.Resources section:

<Style TargetType="ComboBox">
    <Style.Resources>
        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="#FF745005"/>
    </Style.Resources>
    <Setter Property="Template">
        ...
    </Setter>
</Style>