/// <summary>
/// Update a single contact based on Id.
/// </summary>
public Contact Update(int id, string firstName, string lastName,
string email, string homeNumber, string mobileNumber, string imageHash)
{
var contact = GetById(id);
if (contact == null)
{
throw new KeyNotFoundException();
}
// Probably the neater option based on required logic, in reality using
// EF or another ORM could handle this internally inside the Data Layer
// rather than manually in the service.
contact.FirstName = firstName ?? contact.FirstName;
contact.LastName = lastName ?? contact.LastName;
contact.Email = email ?? contact.Email;
contact.HomeNumber = homeNumber ?? contact.HomeNumber;
contact.MobileNumber = mobileNumber ?? contact.MobileNumber;
contact.ImageHash = imageHash ?? contact.ImageHash;
_contactProvider.Update(contact);
return(contact);
}