C#6.0-8.0新功能、ValueTuple

C# 6.0：

https://www.cnblogs.com/yinrq/p/5600530.html

C# 7.0：

https://www.cnblogs.com/cncc/p/7698543.html

C# 8.0：

https://www.cnblogs.com/springsnow/p/11046251.html

ValueTuple：

https://www.cnblogs.com/zhoufangcheng04050227/p/11122847.html