语法糖

字符串: C#中$的用法: 是为了替代string.format();

https://www.cnblogs.com/hilolin/p/9123970.html

https://blog.csdn.net/kebi007/article/details/52612610

语法糖:

C#6.0:  https://www.cnblogs.com/mushroom/p/4666113.html