private static void DeleteContact() { Console.WriteLine(); Console.WriteLine("Please enter the first name and last name of the contact to delete."); Console.WriteLine("First Name"); string contactFirstName = NonEmptyValue(); Console.WriteLine("Last Name"); string contactLastName = NonEmptyValue(); // Get user contact from phone book using the combination his/her first name and last name Contact contact = PhoneBook.FindContactByFirstNameAndLastName(contactFirstName, contactLastName); // if the contact is in phone book, delete it otherwise, tell the user the contact does not exist if (contact == null) { Console.WriteLine($"Contact with First Name:'{contact.FirstName}' and Last Name: '{contact.LastName}' does not exist."); } else { PhoneBook.ContactList.Remove(contact); } Console.WriteLine(); Console.WriteLine($"Contact with First Name:'{contactFirstName}' and Last Name: '{contactLastName}' deleted"); Console.WriteLine($"1. Delete another contact phone number\n0. Back"); int userResponse = UserOptionResponse(new int[] { 0, 1 }); switch (userResponse) { case 1: DeleteContact(); break; case 0: Menu(); break; default: break; } }
private static void UpdateContact() { Console.WriteLine(); Console.WriteLine("Please enter the first name and last name of the contact to update."); Console.WriteLine("First Name"); string contactFirstName = NonEmptyValue(); Console.WriteLine("Last Name"); string contactLastName = NonEmptyValue(); // Get user contact from phone book using the combination his/her first name and last name Contact contact = PhoneBook.FindContactByFirstNameAndLastName(contactFirstName, contactLastName); // if the contact is in phone book, update it otherwise, tell the user the contact does not exist if (contact == null) { Console.WriteLine($"Contact with First Name:'{contact.FirstName}' and Last Name: '{contact.LastName}' does not exist."); } else { Console.WriteLine("Please enter the contacts first name."); string firstName = NonEmptyValue(); Console.WriteLine("Please enter the contacts last name."); string lastName = NonEmptyValue(); Console.WriteLine("Please enter the contacts phone number."); string phoneNumber = Console.ReadLine(); // check if the new first name and last name the user entered already belongs to another contact in phone book bool contactExist = PhoneBook.FindContactByFirstNameAndLastName(firstName, lastName) != null; // if the new first name and last name entered by the user belongs to another contact in phone book, // the user is forced to enter a different first name and last name while (contactExist) { Console.WriteLine($"Contact with First Name:'{firstName}' and Last Name: '{lastName}' already exist. Enter a different name"); Console.WriteLine("First Name"); firstName = NonEmptyValue(); Console.WriteLine("Last Name"); lastName = NonEmptyValue(); contactExist = PhoneBook.FindContactByFirstNameAndLastName(firstName, lastName) != null; } contact.FirstName = firstName; contact.LastName = lastName; if (!string.IsNullOrEmpty(phoneNumber) && !string.IsNullOrWhiteSpace(phoneNumber)) { contact.PhoneNumber = phoneNumber; } Console.WriteLine(); Console.WriteLine($"Contact with First Name:'{contactFirstName}' and Last Name: '{contactLastName}' updated"); DisplayContact(contact); } Console.WriteLine(); Console.WriteLine($"1. Update another contact phone number\n0. Back"); int userResponse = UserOptionResponse(new int[] { 0, 1 }); switch (userResponse) { case 1: UpdateContact(); break; case 0: Menu(); break; default: break; } }