To-Do List: Follow-Along Activity

Create a program that keep track of a user's to-do list.

Part 1 - Setup

Set up the menu for the application.

1. In the Main method, display a message to the user welcoming them to the application
2. Under the welcome message, create an infinite while loop
   • This will allow the user to continue entering commands
3. Within the body of the infinite while loop, ask the user for a command to execute, and store their input in a variable
4. The program should be able to handle 3 commands: "Add", "View", and "Exit"
   • Create an if statement to handle a command of "Add"
   • Create an else if to handle a command of "View"
   • Create another else if to handle a command of "Exit"
5. If the user enters a command of "Exit", break out of the infinite loop

Code

Console.WriteLine("Welcome to the To-Do List!");

while (true)
{
    Console.WriteLine("Enter a command:");
    string command = Console.ReadLine();

    if (command == "Add")
    {
        // Add
    }
    else if (command == "View")
    {
        // View
    }
    else if (command == "Exit")
    {
        break;
    }
}

Part 2 - The List

The program needs a List to keep track of what the user wants to do!

List Setup

1. At the top of the Program.cs file, add a using statement that will import Lists:

    using System.Collections.Generic;
   

2. At the top of the body of the Main method, declare a new List of strings and initialize it to an empty list:

    List<string> toDoList = new List<string>();
   

Adding to the List

1. Within the Main method, in the body of the if statement for "Add", ask the user what they want to do
2. Store the user's input in a variable
3. Add the input item to the toDoList!

Code

Console.WriteLine("Enter an item:");
string item = Console.ReadLine();

toDoList.Add(item);

Part 3 - Viewing the List

Once the user has added some items to the list, they will want a way to view those items!

1. In the Program class, define a method named ViewList
   • The method should return void (nothing)
   • The method should take a List<string> as a parameter
2. In the body of the ViewList method, print some text to the console saying "To Do:"
3. Under the "To Do" message, create a foreach loop that will loop through the list
   • foreach keyword
   • Initialize a new string variable
   • in keyword
   • Use the parameter variable for the list
   • Curly brackets
4. In the body of the foreach loop, print the list item, prefaced by "- "
5. In the Main method, in the else if for "View", call the ViewList method with toDoList as the argument

Now the program should work properly!

Code

using System;
using System.Collections.Generic;

namespace Week09
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> toDoList = new List<string>();
            Console.WriteLine("Welcome to the To-Do List!");

            while (true)
            {
                Console.WriteLine("Enter a command:");
                string command = Console.ReadLine();

                if (command == "Add")
                {
                    Console.WriteLine("Enter an item:");
                    string item = Console.ReadLine();

                    toDoList.Add(item);
                }
                else if (command == "View")
                {
                    ViewList(toDoList);
                }
                else if (command == "Exit")
                {
                    break;
                }
            }
        }

        public static void ViewList(List<string> stringList)
        {
            Console.WriteLine("To Do:");
            foreach (string item in stringList)
            {
                Console.WriteLine("- " + item);
            }
        }
    }
}