private string CustomersExist(Dto.Customer[] customers, Guid userId) { var result = string.Empty; var existingCustomers = _customerBusiness.GetAll(userId); if (existingCustomers == null) { return(result); } var customerTitles = customers.Select(c => c.Title); var existingCustomerTitles = existingCustomers.Select(c => c.Title); var findings = from title in customerTitles join existingTitle in existingCustomerTitles on title equals existingTitle select title; var array = findings as string[] ?? findings.ToArray(); if (array.Any()) { result = array.First(); } return(result); }
public List <Customer> GetAll() { return(_customerBusiness.GetAll()); }