WPF 启用/禁用控件
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WPF enable/disable controls
提问by TheWommies
When I disable a control in WPF, like say a menu item like
当我禁用 WPF 中的控件时，比如说一个菜单项
MenuItem aMenuItem = ...
aMenuItem.IsEnabled = false;
the text in the MenuItem is still active, that is it is not grayed out as you would expect when items are disabled.
MenuItem 中的文本仍然处于活动状态，也就是说，当项目被禁用时，它不会像您期望的那样变灰。
Is there a simple way to do this not only for Menu items but for any WPF control?
是否有一种简单的方法不仅可以针对菜单项而且可以针对任何 WPF 控件执行此操作？
回答by Aran Mulholland
yes by using commands. MenuItems and Buttons have a command property. a Command is an implementation of the ICommand interface which has a method called CanExecute. When can execute is called if it returns true the menutitem or button is enabled, otherwise it is greyed out.
是通过使用命令。MenuItems 和 Buttons 有一个 command 属性。命令是 ICommand 接口的一个实现，它有一个名为 CanExecute 的方法。当 can execute 被调用时，如果它返回 true 菜单项或按钮被启用，否则它是灰色的。
回答by someone
You can also just set the opacity of the control to 0.5 , to get the "grayed out" effect
您也可以将控件的不透明度设置为 0.5 ，以获得“变灰”效果
