C# Objects Challenge: Address Book

Question

Hi I should just say it and get it out of the way that I´m an absolute beginner in programming and in spite of my best efforts, I´m mostly stumbling along I´m kinda stumped on an error I´m getting. It´s a CS1061 error in my Program.cs file on the 43rd line where its says: contacts.NewEntry(); I´d really appreciate some help here please. The code is below...

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Threading; using AddressBookChallenge.Helpers;

namespace AddressBookChallenge { class Program { static void Main(string[] args) {

        AddressBook[] contacts = new AddressBook[5];

        bool keepGoing = true;
        string entry;

        while (keepGoing == true)
        {
            Console.WriteLine("Hello, welcome to Address Book");
            Console.Write("Please enter your name: ");
            string name = Console.ReadLine();
            Thread.Sleep(1000);
            Console.WriteLine("Let´s begin!");
            Thread.Sleep(2000);
            Console.Clear();
            Menu.Options();
            Console.Write("Option: ");
            entry = Console.ReadLine();

            if (entry.ToLower() == "quit")
            {
                Console.WriteLine("Goodbye");
                Thread.Sleep(2000);
                keepGoing = false;
            }
                if (entry.ToLower() == "add")
                {
                    Console.Clear();
                    contacts.NewEntry();
                }
                else if (entry.ToLower() == "clear")
                {
                    Console.Clear();
                    continue;
                }
                else if (entry.ToLower() == "search")
                {

                }
                else
                {
                    Console.WriteLine("That is not a valid Option, please try again " + name);
                    continue;
                }

            Thread.Sleep(2000);
            break;

        }
    }
}

}

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;

namespace AddressBookChallenge.Helpers { class AddressBookEntry { public string FirstName { get; set; } public string LastName { get; set; } public int PhoneNumber { get; set; } public string Address { get; set; } public string Email { get; set; }

    public AddressBookEntry()
    {

    }

    public AddressBookEntry(string firstName, string lastName)
    {
        FirstName = firstName;
        LastName = lastName;
    }

}

}

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;

namespace AddressBookChallenge.Helpers { class Menu { public static void Options() { Console.WriteLine("The following is a list of options: \n" + "1. Type \"add\" to add someone in the Address Book. \n" + "2. Type \"clear\" to clear the Console. \n" + "3. Type \"quit\" to close the Address Book. \n" + "4. Type \"search\" to look for soomeone in the Address Book."); } } }

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Threading; using AddressBookChallenge.Helpers;

namespace AddressBookChallenge.Helpers { class AddressBook { public AddressBookEntry[] people; public int Size { get; private set; } private int _totalEntries = 0;

    public AddressBook(int size)
    {
        people = new AddressBookEntry[size];
        Size = size;
    }

    public void NewEntry()
    {
            Console.Write("New Entry: \n");
            AddressBookEntry person = new AddressBookEntry();
            Console.Write("Enter as First Name: ");
            person.FirstName = Console.ReadLine();
            Console.Write("Enter a Last Name: ");
            person.LastName = Console.ReadLine();
            Console.Write("Enter a Phone Number: ");
            person.PhoneNumber = Int32.Parse(Console.ReadLine());
            Console.Write("Enter an Address: ");
            person.Address = Console.ReadLine();
            Console.Write("Enter an Email: ");
            person.Email = Console.ReadLine();

            Console.WriteLine("Your new contacts details are:");
            Console.WriteLine("\n" + person.FirstName + "\n" + person.LastName + "\n" + person.Address + "\n" + person.PhoneNumber + "\n" + person.Email);
            Thread.Sleep(5000);

            people[_totalEntries++] = person;
    }

}

}

Answer 1 · 2018-05-07T12:21:00Z

May 7, 2018 12:21pm

The problem with the code is in this line :

AddressBook[] contacts = new AddressBook[5];

It should be changed to :

AddressBook contacts = new AddressBook(5);

The local variable has to be of type AddressBook but it is declared to be an array of AddressBook(s).

The code would be much more readable and maintainable if the numerous if ... else if ... statements are replaced with a switch statement:

                switch (entry.ToLower())
                {
                    case "quit":
                        {
                            ...
                        }

                    case "add":
                        {
                            ...
                        }

                    case "clear":
                        {
                            ...
                        }

                    case "search":
                        {
                            ...                       
                        }
                    default:
                        {
                            ...
                        }
                }

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