限制鼠标活动区域，限制鼠标的活动区域，当然也可以解锁，算是一个较初级的程序实例吧，希望C#初学者喜欢并参考一下-Mouse activity area restrictions, limiting the active area of ​ ​ the mouse, of course, you can also unlock can be regarded as a junior program instance, C# beginners like reference