/// <summary>
/// Returns the contacts that have last names matching the supplied value.
/// </summary>
/// <param name="lastName">The last anme to search for in the database.</param>
/// <returns>An array of <c>string</c>s that contain the matching contacts. Each entry in the <c>Array</c> contains the contact data in the format:
/// "lastName,firstName,phoneNumber".</returns>
/// <exception cref="ArgumentException">Thrown if the supplied last name to search for is over length.</exception>
public string[] GetEntries(string lastName)
{
// Validate the supplied value for lastName
if (lastName.Length > 50)
{
throw new ArgumentException("Last name is longer than 50 characters", "lastName");
}
// List to hold the returned contacts
List <string> entries = new List <string>();
// Create a DataContext and scope it to the database interaction
using (PhoneBookDatabaseDataContext dataContext = new PhoneBookDatabaseDataContext())
{
// Call the GetEntries stored procedure in the PhoneBook database
var results = dataContext.GetEntries(lastName).ToList();
// Loop over the returned contacts and populate the reulsts list, formatting each contact that was found into a single string
foreach (PhoneBook entry in results)
{
entries.Add(formatRecord(entry.LastName) + formatRecord(entry.FirstName) + entry.PhoneNumber.TrimEnd());
}
}
// Return the results list as an arry of strings
return(entries.ToArray());
}
/// <summary>
/// Adds a new contact to the database.
/// </summary>
/// <param name="lastName">The last name of the contact.</param>
/// <param name="firstName">The first name of the contact.</param>
/// <param name="phoneNumber">The phone number of the contact.</param>
/// <returns>A <c>string</c> stating "Contact added" if the contact was successfully added to the database.</returns>
/// <exception cref="ArgumentException">Thrown if any of the supplied values is over length.</exception>
public string AddEntry(string lastName, string firstName, string phoneNumber)
{
// Validate the supplied paramters
validateContact(lastName, firstName, phoneNumber);
// Create a DataContext and scope it to the database interaction
using (PhoneBookDatabaseDataContext dataContext = new PhoneBookDatabaseDataContext())
{
// Call the AddEntry stored procedure in the database to add the contact
dataContext.AddEntry(lastName, firstName, phoneNumber);
}
// Return a message stating that the contact was added successfully
return("Contact added");
}
