[net core]vs 2019 CodeLens function 被引用參考 指標
https://xupeiyao.github.io/2019/04/05/how_to_enable_codelens_on_vs2019_community/
[net core] DI-
Transient
Scoped
Singleton
分享一篇很好文章
https://blog.johnwu.cc/article/ironman-day04-asp-net-core-dependency-injection.html