Accessing Json Array from appsettings using Options .NET C#

Ok, so I was able to solve the problem:

I kept my appsettings.json the way it is with config classes.

I changed Startup code to this:

EmailInfo[] emails = Configuration.GetSection("EmailList").Get<EmailInfo[]>();

services.Configure<EmailList>(options => {options.EmailArray = emails.ToList();});

In my Controller:

This stays the same

public class DevController : Controller
    {
        private readonly EmailList _devEmailList;
        private List<string> _emailList;

        public DevController(

            IOptions<EmailList> _devEmailList,
        {

            _devEmailList = devEmailList.Value; 
            
            _emailList = new List<string>();

        }
    }

Getting emails:

public IActionResult Index() {

    var result = _udeEmailList.EmailArray;

    foreach (var mailInfo in result)
      {
        emailsList.Add(mailInfo.Email);
      }
  }

what you are retrieving as your section is IEnumerable<EmailAddress> not EmailList. Read what you wrote, in your config there's no "EmailArray" definition.

You can add another level in your config (useful if you will have more things relative to email configuration in that section) or change the type to IEnumerable<EmailAddress> (not needed to be concretely IEnumerable, anything that implements it like an array or a list will work).

If you go for the first option you must do something like this:

In your config file...

{
    "EmailConfig":{
        "EmailList":[
           {
            "name":"John Algovich",
            "email":"[email protected]"
           },
         {
            "name":"Petr Algr",
            "email":"[email protected]"
         },
         {
            "name":"Mathew Cena",
            "email":"[email protected]"
         }
      ]

       //You can add here more properties

   }
}

Your config classes:

public class EmailAddress
{
    public string Name { get; set; }
    public string Email { get; set; }
}

public class EmailConfig
{
    public List<EmailAddress> EmailList { get; set; }
}

Your configuration:

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

And the controller:

public class DevController : Controller
{
    private readonly EmailConfig _mailConfig;

    public DevController(IOptions<EmailConfig> mailConfig)
    {

        _mailConfig = mailConfig.Value;

    }

    public IActionResult Index()
    {
        var result = _mailConfig.EmailList;
    }
}