ComboBox的WPF边框

问题描述：

我尝试使用基于ToolBar.ComboBoxStyleKey的ComboBox。它具有平面设计。
控件默认情况下没有边框，即在白色背景上只有ToggleButton的可见图标。
当焦点不在ComboBox上时如何添加边框以进行控制？

I try to use a ComboBox based on ToolBar.ComboBoxStyleKey. It has a flat design. Control by default does not have a border, i.e., on a white background is only visible icon of ToggleButton. How can I add border for control when focus isn't on ComboBox?

谢谢！

没有焦点：

鼠标悬停：

答

WPF中有一个Border控件，您可以使用它来包裹ComboBox。

There is a Border control in WPF, you could use that to wrap around your ComboBox.

<Border Background="GhostWhite" BorderBrush="Gainsboro" BorderThickness="1">
    <ComboBox>
        ...
    </CombodBox>
</Border>

http://www.wpf-tutorial.com/misc-controls/the-border-control/

您可以根据组合框是否具有焦点来设置BorderThickness。

You could set the BorderThickness according to if the combobox has the focus or not.

ComboBox的WPF边框

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