using System;

using System.ComponentModel.DataAnnotations;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Options;

#nullable enable

​

public class Program

{

    public static void Main()

    {

        try

        {

            ServiceCollection sc = new();

            sc.AddOptions<MyOptions>()

                .ValidateDataAnnotations();

            sc.ConfigureOptions<ConfigureMyOptions>(); // Comment this out

            var provider = sc.BuildServiceProvider();

            using (var scope = provider.CreateScope())

            {

                var options = scope.ServiceProvider.GetService<IOptions<MyOptions>>();

                var test = options.Value;

            }

        }

        catch (Exception ex)

        {

            Console.WriteLine(ex.Message);

        }

    }

}

​

public class MyOptions

{

    [Required]

    public string Value { get; set; } = null;

}

​

public class ConfigureMyOptions : IConfigureOptions<MyOptions>

{

    public void Configure(MyOptions options)

    {

        options.Value = "erik";

    }

}