.net core 读取配置文件的值

.net core中的配置文件可以存一些自定义的值，我们需要去读取

在配置中添加json:

 "name": "sealee",
  "ConnectionStrings": {
    "SqlServerConnection": "Development.json"
  },
  "JwtSettings": {
    "Issuer": "ss",
    "Audience": "aa",
    "SecretKey": "djwidwhjidwjd"
  },

①介绍

②控制器中怎么得到对象配置

 GetSection,GetChildren,Exists的介绍：https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/configuration/?view=aspnetcore-2.2#getsection-getchildren-and-exists