见 https://blog.csdn.net/mzl87/article/details/84892916
https://www.codeproject.com/Articles/1235077/Getting-Started-With-ASP-NET-Core-Identity-And-Rol
ASP.NET Core 2.0身份和角色管理入门
原文：https://www.cnblogs.com/dare/p/11772163.html
