db configuration provider

PARR.DAL/Configurations/DbSettings/DBConfigurationExtantions.cs

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+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace PARR.DAL.Configurations.DbSettings
+{
+    internal static class DBConfigurationExtantions
+    {
+        public static IConfigurationBuilder AddDbSettings(this IConfigurationBuilder builder, IServiceCollection services)
+        {
+            return builder.Add(new DBConfigurationSource(services));
+        }
+    }
+}

PARR.DAL/Configurations/DbSettings/DBConfigurationProvider.cs

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+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using PARR.DAL.Context;
+using PARR.DAL.Contracts;
+
+namespace PARR.DAL.Configurations.DbSettings
+{
+    internal class DBConfigurationProvider : ConfigurationProvider
+    {
+        private readonly IServiceCollection services;
+
+        public DBConfigurationProvider(IServiceCollection services)
+        {
+            this.services = services;
+        }
+
+        public override void Load()
+        {
+            using (var dataContext = services.BuildServiceProvider().GetService<DataContext>())
+            {
+                //если миграциями БД еще не создана, то SettingsInDbs будет недоступна
+                try
+                {
+                    var settings = dataContext?.Setting.ToList();
+
+                    if (settings == null)
+                        return;
+
+                    if (settings != null)
+                    {
+                        //формируем список с корневым SettingsFromDb, и в него вложены дочерние настройки из БД, чтобы потом забиндить в класс
+                        Data = settings.ToDictionary(settings => $"{nameof(SettingsFromDb)}:{settings.Name}", settings => (string?)settings.Value);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    //TODO: логи, я не тестил, возможно надо через BuildServiceProvider прокинуть ILogger
+                }
+            }
+        }
+    }
+}

PARR.DAL/Configurations/DbSettings/DBConfigurationSource.cs

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+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace PARR.DAL.Configurations.DbSettings
+{
+    internal class DBConfigurationSource : IConfigurationSource
+    {
+        private readonly IServiceCollection services;
+
+        public DBConfigurationSource(IServiceCollection services)
+        {
+            this.services = services;
+        }
+
+        public IConfigurationProvider Build(IConfigurationBuilder builder)
+        {
+            return new DBConfigurationProvider(services);
+        }
+    }
+}