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Classes and Array of Objects in Visual C# 2008?

Jul 26, 2010 by Drew | Posted in Programming & Design

I am taking a Visual C# class, and I've had a bit of a difficult time understanding some of the concepts. If you can help me with the following, I would greatly appreciate it. I am using Visual Studio 2008 Professional with .NET 3.5 SP 1.

"Create a class named Friend. Its fields include a Friend’s name, phone number, and three integer fields that together represent the Friend’s birthday—month, day, and year. Write a program that declares an array of eight Friend objects and prompts the user to enter data about eight friends. Display the Friend objects in alphabetical order by first name. Save the program as FriendList.cs."

I have the following code, but after running it in VS, the program stops because it cannot Compare two strings. I'm not sure if I've coded something incorrectly for the Sort portion. If you can point me to where I'm going wrong, I would greatly appreciate it.

I changed the friends array to 2 instead of 8 for simplicity.
------------------------------------------------------------------
using System;
public class CreateFriendList
{
public static void Main()
{
Friend[] friend = new Friend[2];
int x;
string name;
string phone;
int month;
int day;
int year;

for (x = 0; x < friend.Length; ++x)
{
GetData(out name, out phone, out month, out day, out year);
friend[x] = new Friend(name, phone, month, day, year);
}

Array.Sort(friend);
Console.WriteLine("Sorted List:");
for (x = 0; x < friend.Length; ++x)
Display(friend[x]);

Console.ReadLine();
}

public static void GetData(out string name, out string phone, out int month, out int day, out int year)
{
string inString;
Console.Write("Please enter your friend's name: ");
inString = Console.ReadLine();
name = Convert.ToString(inString);
Console.Write("Please enter your friend's number: ");
inString = Console.ReadLine();
phone = Convert.ToString(inString);
Console.Write("Please enter your friend's birth MONTH: ");
inString = Console.ReadLine();
month = Convert.ToInt32(inString);
Console.Write("Please enter your friend's birth DAY: ");
inString = Console.ReadLine();
day = Convert.ToInt32(inString);
Console.Write("Please enter your friend's birth YEAR: ");
inString = Console.ReadLine();
year = Convert.ToInt32(inString);
}

public static void Display(Friend fri)
{
Console.WriteLine("0,5}{1,-10}{2,6}{3,6}{4,6}",
fri.Name, fri.Phone, fri.Month, fri.Day, fri.Year);
}
}

public class Friend //: IComparable
{
private string name;
private string phone;
private int month;
private int day;
private int year;

public string Name { get; set; }
public string Phone { get; set; }
public int Month { get; set; }
public int Day { get; set; }
public int Year { get; set; }

public Friend(string friendName, string friendNumber, int friendMonth, int friendDay, int friendYear)
{
Name = friendName;
Phone = friendNumber;
Month = friendMonth;
Day = friendDay;
Year = friendYear;
}

/*int IComparable.CompareTo(object o)
{
int returnVal;
Friend temp = (Friend)o;
if (this.Name > temp.Name)
returnVal = 1;
else
if (this.Name < temp.Name)
returnVal = -1;
else
returnVal = 0;
return returnVal;
}*/
}

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