DocSpace-client/common/ASC.Common/Utils/ConfigurationManager.cs

namespace ASC.Common.Utils
{
    public class ConnectionStringCollection : IEnumerable<ConnectionStringSettings>
    {
        private List<ConnectionStringSettings> _data;

        public ConnectionStringSettings this[string name] => _data.FirstOrDefault(r => r.Name == name);

        public ConnectionStringCollection(IEnumerable<ConnectionStringSettings> data) => _data = data.ToList();

        public IEnumerator<ConnectionStringSettings> GetEnumerator() => _data.GetEnumerator();

        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
    }

    [Singletone]
    public class ConfigurationExtension
    {
        public string this[string key]
        {
            get => _configuration[key];
            set => _configuration[key] = value;
        }

        private readonly IConfiguration _configuration;
        private readonly Lazy<ConnectionStringCollection> _connectionStringSettings;

        public ConfigurationExtension(IConfiguration configuration)
        {
            _configuration = configuration;
            _connectionStringSettings = new Lazy<ConnectionStringCollection>(new ConnectionStringCollection(GetSettings<ConnectionStringSettings>("ConnectionStrings")));
        }

        public IEnumerable<T> GetSettings<T>(string section) where T : new()
        {
            var result = new List<T>();

            var sectionSettings = _configuration.GetSection(section);

            foreach (var ch in sectionSettings.GetChildren())
            {
                var cs = new T();
                ch.Bind(cs);
                result.Add(cs);
            }

            return result;
        }

        public T GetSetting<T>(string section) where T : new() => GetSetting(section, new T());

        public T GetSetting<T>(string section, T instance)
        {
            var sectionSettings = _configuration.GetSection(section);

            sectionSettings.Bind(instance);

            return instance;
        }

        public ConnectionStringCollection GetConnectionStrings() => _connectionStringSettings.Value;

        public ConnectionStringSettings GetConnectionStrings(string key) => GetConnectionStrings()[key];
    }
}