gistfile1.txt

class ObjectSettingsReader : ISettingsReader
    {
        private readonly Dictionary<string, string> _values;
 
        public ObjectSettingsReader(object obj)
        {
            var q = from p in obj.GetType().GetProperties()
                    where p.CanRead
                    let v = "" + p.GetValue(obj)
                    where v != ""
                    select new { Key = p.Name, Value = v };
            _values = q.ToDictionary(x => x.Key, x => x.Value);
        }
 
        public string ReadValue(string key)
        {
            string value;
            return _values.TryGetValue(key, out value) ? value : null;
        }
 
        public IEnumerable<string> AllKeys
        {
            get { return _values.Keys; }
        }
    }
    
    class MultipleSourceSettingsReader : ISettingsReader
{
   private readonly ISettingsReader[] _readers;

   public MultipleSourceSettingsReader(params ISettingsReader[] readers)
   {
      
   }

   public string ReadValue(string key)
   {
   	   return _readers.Select(r => r.ReadValue(key)).FirstOrDefault (v => v != null);
   }

   public IEnumerable<string> AllKeys
   {
       get { return _readers.SelectMany(r => r.AllKeys); }
   }
}