First of all I need to make it clear that I have no interest in keylogging.
I need a way to monitor keyboard activity at the most basic level while my application is in the background. I don't need to know which keys, I don't need to save any data, I don't need or plan to hide my application at all, all I need is to know when keys are pressed and invoke a method.
I'm looking for the simplest way to do this possible, I know a reasonable amount of C# but nothing too complex as most of my knowledge is self-taught.
I've looked around for some appropriate ways of doing this and I've found nothing useful. All I've found is a bunch of people saying "No, that's illegal" on forums and source code for in depth keyloggers.
If any of you could advise me on a way to achieve this then I would be most appreciative.
There is an article that has working sample for what you require(It also monitors keyboard and mouse events in the background) at :
You'll need to use Window Hooks:
But beware, Windows security, may be protecting us from doing what you want!
Microsoft tells you How to: Handle Keyboard Input at the Form Level. As long as you handle the same event(s) this works for any non web application.
You should also take a look at the other questions here on SO, such as Handling Input from a Keyboard Wedge
You could register Windows Hot Key with RegisterHotKey windows API, look at this blog post :
来源：https://stackoverflow.com/questions/10383569/monitoring-keyboard-activity-in-c-sharp-while-my-application-is-in-the-backgroun