.net core读取配置文件

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "name": { "name": "testConfig" }
}

    ConfigurationBuilder configBuilder = new ConfigurationBuilder();
    configBuilder.AddJsonFile("appsettings.json", optional: false, reloadOnChange: false);//, reloadonChange: false);
    IConfigurationRoot config = configBuilder.Build();
    //string name = config["name"];
    //Console.WriteLine($"name={name}");
    string proxyAddress = config.GetSection("Logging:LogLevel:Default").Value;
    Console.WriteLine($"Address: {proxyAddress}");