c# 关于刺激界面透明

https://www.cnblogs.com/hanye/archive/2010/01/13/1646907.html

https://blog.csdn.net/jumtre/article/details/16865845

https://msdn.microsoft.com/zh-cn/library/system.windows.media.solidcolorbrush.aspx

https://www.cnblogs.com/y114113/p/6946035.html