//private DBContext db;

        //public ExchangeRateReceiver(DBContext context)
        //{
        //    db = context;

        //}

        /// <summary>
        /// Получить курс валют с сайта
        /// </summary>
        /// <param name="url">Url сайта с курсами валют</param>
        public async Task GetRateFromSite(string url)
        {
            var builder = new UriBuilder(url);

            using (var client = new HttpClient())
            {
                var result = client.GetAsync(builder.Uri).Result;
                using (StreamReader sr = new StreamReader(result.Content.ReadAsStreamAsync().Result))
                {
                    RootObject bankData = JsonConvert.DeserializeObject <RootObject>(await sr.ReadToEndAsync());
                    var        entity   = new List <RateDTO>()
                    {
                        new RateDTO
                        {
                            DateAdded       = DateTime.Now,
                            ConversionPairs = bankData.Valute.USD.CharCode + "_RUB",
                            Rates           = bankData.Valute.USD.Value
                        },
                        new RateDTO
                        {
                            DateAdded       = DateTime.Now,
                            ConversionPairs = bankData.Valute.EUR.CharCode + "_RUB",
                            Rates           = bankData.Valute.EUR.Value
                        }
                    };


                    foreach (var rate in entity)
                    {
                        rateService.CreateRateAsync(rate);
                    }
                }
            }
        }