How to bind json data to class with dependency injection like ASP.NET Core

Question

This is my class :

public class entityClass
{
    public string id { get; set; }
    public string os { get; set; }
}

and this is my appsetings.json :

{
  "key1": {
    "id": "4",
    "os": "XP"
  }
}

Please help me to fix this:

class Program
{
    static void Main(string[] args)
    {
        IConfiguration configur = new ConfigurationBuilder()  //using Microsoft Configuration
                .SetBasePath(@"C:\ConsoleApp26\").AddJsonFile("appsetting.json").Build();

        ServiceCollection service1 = new ServiceCollection(); //using Microsoft DependencyInjection
        service1.Configure<entityClass>(configur.GetSection("key1")); //Error

        var test = new ClassController();
        Console.WriteLine(test.id + "==>" + test.os);
    }
}

class ClassController
{
    private readonly IOptions<entityClass> _entity;            //using Microsoft.Extensions.Options;

    public ClassController(IOptions<entityClass> entity)
    {
        _entity = entity;
    }

    public entityClass YMethod()
    {
        var view = _entity.Value;
        return view;
    }
}

It's very convenient at ASP.NET Core but it doesn't happen on the console...

I want to get the right answer in exactly the same way...

This is exactly the style of the code I wrote in ASP.NET Core MVC

Answer 1

Your provided code has no error where you comment it but 3 other:

Here is how to fix them:

1. You have to build an IServiceProvider and use that to create an instance of ClassController. To do so you also have to register that class to the ServiceCollection.
2. Call the YMethod from the ClassController instance to get an instance of entityClass.

service1.AddTransient<ClassController>();

var provider = service1.BuildServiceProvider();
var test = provider.GetRequiredService<ClassController>().YMethod();

Here is the final result

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;

namespace ConsoleApp1;

public class entityClass
{
    public string id { get; set; }
    public string os { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        IConfiguration configur = new ConfigurationBuilder()  //using Microsoft Configuration
                .SetBasePath(@"C:\ConsoleApp26\")
                .AddJsonFile("appsetting.json")
                .Build();

        ServiceCollection service1 = new ServiceCollection(); //using Microsoft DependencyInjection
        service1.Configure<entityClass>(configur.GetSection("key1")); //Error
        service1.AddTransient<ClassController>();

        var provider = service1.BuildServiceProvider();
        var test = provider.GetRequiredService<ClassController>().YMethod();
        
        Console.WriteLine(test.id + "==>" + test.os);
    }
}

class ClassController
{
    private readonly IOptions<entityClass> _entity;            //using Microsoft.Extensions.Options;

    public ClassController(IOptions<entityClass> entity)
    {
        _entity = entity;
    }

    public entityClass YMethod()
    {
        var view = _entity.Value;
        return view;
    }
}