WPF Color（颜色）转换

参考：

https://www.cnblogs.com/xpvincent/p/4431514.html

c#、wpf 字符串，color，brush之间的转换

https://www.cnblogs.com/ZXdeveloper/p/5993863.html

C# 的Brush 及相关颜色的操作

https://www.cnblogs.com/ZXdeveloper/p/4703830.html