PersistedOptions.cs

namespace PowerControl
{
    public class PersistedOptions : CommonHelpers.BaseSettings
    {
        public const string OptionsKey = "Options";

        public PersistedOptions(string name) : base(name + "Options")
        {
        }

        public struct Option
        {
            public PersistedOptions Options { get; set; }
            public string Key { get; set; }

            public string FullKey(string setting)
            {
                return String.Format("{0}_{1}", Key, setting);
            }

            public bool Exist
            {
                get => Options.GetOptions().Contains(Key);
            }

            public Option Set<T>(string setting, T value)
            {
                // Get and persist value on first access
                Options.Get(FullKey(setting), value, true);
                return this;
            }

            public T Get<T>(string setting, T defaultValue)
            {
                // Get and do not persist value
                return Options.Get(FullKey(setting), defaultValue, false);
            }
        }

        public Option ForOption(string option)
        {
            return new Option() { Options = this, Key = option };
        }

        public void SetOptions(IEnumerable<Option> options)
        {
            Set<string>(OptionsKey, String.Join(",", options.Select((option) => option.Key)));
        }

        public string[] GetOptions()
        {
            var options = Get<string>(OptionsKey, "");
            return options.Split(',', StringSplitOptions.RemoveEmptyEntries);
        }
    }
}