private static void CreateContact()
{
Console.WriteLine("Please enter the contacts first name.");
string contactFirstName = NonEmptyValue();
Console.WriteLine("Please enter the contacts last name.");
string contactLastName = NonEmptyValue();
Console.WriteLine("Please enter the contacts phone number.");
string contactPhoneNumber = NonEmptyValue();
// Check if the first name and last name the user entered already belongs to another contact in phone book
bool contactExist = PhoneBook.FindContactByFirstNameAndLastName(contactFirstName, contactLastName) != null;
// if the 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($"Contact with First Name:'{contactFirstName}' and Last Name: '{contactLastName}' already exist. Enter a different name");
Console.WriteLine("First Name");
contactFirstName = NonEmptyValue();
Console.WriteLine("Last Name");
contactLastName = NonEmptyValue();
contactExist = PhoneBook.FindContactByFirstNameAndLastName(contactFirstName, contactLastName) != null;
}
Contact contact = new Contact();
contact.FirstName = contactFirstName;
contact.LastName = contactLastName;
contact.PhoneNumber = contactPhoneNumber;
PhoneBook.ContactList.Add(contact);
Console.WriteLine();
Console.WriteLine("New contact added");
DisplayContact(contact);
Console.WriteLine();
Console.WriteLine($"1. Create another contact\n0. Back");
int userResponse = UserOptionResponse(new int[] { 0, 1 });
switch (userResponse)
{
case 1:
CreateContact();
break;
case 0:
Menu();
break;
default:
break;
}
}
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;
}
}