来自帖子WPF：如何以编程方式从文本框中删除焦点 https://stackoverflow.com/questions/2914495/wpf-how-to-programmatically-remove-focus-from-a-textbox，我知道如何设置TextBox使用以下代码将焦点返回到其父级：
// Move to a parent that can take focus
FrameworkElement parent = (FrameworkElement)textBox.Parent;
while (parent != null && parent is IInputElement
&& !((IInputElement)parent).Focusable)
{
parent = (FrameworkElement)parent.Parent;
}
DependencyObject scope = FocusManager.GetFocusScope(textBox);
FocusManager.SetFocusedElement(scope, parent as IInputElement);
有没有什么方法可以概括此代码（如模板函数），使其也适用于其他项目，例如ComboBox, Canvas, Image etc.
它应该相对简单：
FrameworkElement ctrl = control; //or whatever you're passing in, since all controls are FrameworkElements.
// Move to a parent that can take focus
FrameworkElement parent = (FrameworkElement)ctrl.Parent;
while (parent != null && parent is IInputElement
&& !((IInputElement)parent).Focusable)
{
parent = (FrameworkElement)parent.Parent;
}
DependencyObject scope = FocusManager.GetFocusScope(ctrl); //can pass in ctrl here because FrameworkElement inherits from DependencyObject
FocusManager.SetFocusedElement(scope, parent as IInputElement);
这是可行的，因为所有控件都继承自 FrameworkElement，而 FrameworkElement 又继承自 DependencyObject。所以你可以设置ctrl您想要的任何类型的控件：ComboBox, TextBox, Button, Canvas, etc.
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