public GenericRepository(CurrencyExchangeContext currencyExchangeContext)
 {
     _currencyExchangeContext = currencyExchangeContext;
     _dbSet = currencyExchangeContext.Set <TEntity>();
 }
 public UnitOfWork(CurrencyExchangeContext currencyExchangeContext)
 {
     _currencyExchangeContext = currencyExchangeContext;
     _repositories            = new ConcurrentDictionary <Type, object>();
 }