{
  "Position": {
    "Title": "编辑器",
    "Name": "Joe Smith"
  },
  "MyKey": "My appsettings.json Value",
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

 var name = Configuration["Position:Name"];

 public class Logging
  {
    public LogLevel LogLevel { get; set; }
  }
  public class LogLevel
  {
    public string Default { get; set; }
    public string Microsoft { get; set; }
    public string Lifetime { get; set; }
  }

services.Configure<Logging>(Configuration.GetSection("Logging"));

 private readonly Logging _config;
 public HomeController(IOptions<Logging> config)
 {
   _config = config.Value;
 }

public Startup(IConfiguration configuration)
    {
      Configuration = configuration;
      configuration.GetSection("Logging").Bind(MySettings.Setting);
    }

public static class MySettings
  {
    public static Logging Setting { get; set; } = new Logging();
  }