view-by-distance-mklink-console/Date-Group/Models/Binder/AppSettings.cs

using Microsoft.Extensions.Configuration;
using System.Text.Json;

namespace View_by_Distance.Date.Group.Models.Binder;

public class AppSettings
{

#nullable disable

    public string Company { get; set; }
    public int? MaxDegreeOfParallelism { get; set; }
    public string WorkingDirectoryName { get; set; }

#nullable restore

    public override string ToString()
    {
        string result = JsonSerializer.Serialize(this, new JsonSerializerOptions() { WriteIndented = true });
        return result;
    }

    private static void PreVerify(IConfigurationRoot configurationRoot, AppSettings? appSettings)
    {
        if (appSettings?.Company is null)
        {
            List<string> paths = [];
            foreach (IConfigurationProvider configurationProvider in configurationRoot.Providers)
            {
                if (configurationProvider is not Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider jsonConfigurationProvider)
                    continue;
                if (jsonConfigurationProvider.Source.FileProvider is not Microsoft.Extensions.FileProviders.PhysicalFileProvider physicalFileProvider)
                    continue;
                paths.Add(physicalFileProvider.Root);
            }
            throw new NotSupportedException($"Not found!{Environment.NewLine}{string.Join(Environment.NewLine, paths.Distinct())}");
        }
    }

    private static Models.AppSettings Get(AppSettings? appSettings)
    {
        Models.AppSettings result;
        if (appSettings?.MaxDegreeOfParallelism is null)
            throw new NullReferenceException(nameof(appSettings.MaxDegreeOfParallelism));
        result = new(
            appSettings.Company,
            appSettings.MaxDegreeOfParallelism.Value,
            appSettings.WorkingDirectoryName
        );
        return result;
    }

    public static Models.AppSettings Get(IConfigurationRoot configurationRoot)
    {
        Models.AppSettings result;
#pragma warning disable IL3050, IL2026
        AppSettings? appSettings = configurationRoot.Get<AppSettings>();
#pragma warning restore IL3050, IL2026
        PreVerify(configurationRoot, appSettings);
        result = Get(appSettings);
        return result;
    }

}