C#实现QQ自动隐藏式窗口效果，鼠标放上会显示出整个窗口，鼠标移开后，窗口自动隐藏屏幕顶部边缘，和QQ的主窗口效果极为相似。-C# implementation QQ automatic hidden window effect, the mouse will be placed on display the entire window, the mouse is removed, the top edge of the screen window to automatically hide,