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我有一个C#应用程序，只要我按下CTRL+1键，它就会执行特定的操作。但问题是CTRL+1方法仅在表单处于焦点时才有效。当我将表单最小化到系统托盘时，CTRL+1不起作用。任何人都可以告诉我如何跟踪按下的键，即使表单被最小化？