asp.net核心2.1 ConfigurationBuilder GetSection函数返回null

Question

ConfigurationBuilder Getsection() return null on .net core 2.1 console application. I have been searched quite a few blogs and posts but there is json example where its nested upto 3-4 levels.

Motive is to read the whole "test" key of json and its elements and do operations. I want this json to be configurable outside the application, so it can be changed without making any changes in code. Below is the sample code

{
  "test": {
    "test1": {
      "testing": {
        "ApplicationName": "Microsoft Visual Studio", 
        "appid": "123456", 
        "ApplicationProfile": {
          "Vs2015": "Microsoft Visual Studio 2015 Professional",
          "VS_2017_Restricted": "Microsoft Visual Studio 2017 Enterprise (Restricted)"
        }
      }
      },
      "Applications": {
        "app1": {
          "Name": "application1",
          "arrayOfSomething": [ "first array elment", "Secondarrayelement" ],
          "anotherarraylikeabove": [],

        },
        "app2": {
          "Name": "application2",
          "Softwares": [ "first array elment", "second element" ],
          "APACGroups": [],
          "EMEA": [],
          "OnlyForZurich": [] 
        }
      }
    }
  }
}

var builder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appSettings.json", optional: true, reloadOnChange: true);
IConfigurationRoot configuration = builder.Build();
var test  = configuration.GetSection("app2"); //test is null always

Answer 1

use this one maybe it work:

json:

   "Locations": {
        "Location": [ "Ford", "BMW", "Fiat" ]
    },

startup:

 // Replace IConfiguration with IHostingEnvironment since we will build
    // Our own configuration
    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(env.ContentRootPath)
            .AddEnvironmentVariables()
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

        // Set the new Configuration
        Configuration = builder.Build();
    }

and get data from:

 public IActionResult Settings()
    {
       var array = Configuration.GetSection("Locations:Location")
           .GetChildren()
           .Select(configSection => configSection.Value);
       return View();
    }