FileHelper.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace VehicleInventory
{
    // This is a static class that is used to load the inventory from a text file
	static class FileHelper
	{
        // This private function loads a text file into a list of strings based on its lines.
        // It can be marked as private because it will only be called by the GetCars function
        // which is accessible to other classes
		private static List<string> LoadInventory(string filepath)
		{
            // Skip the first line because it contains column headings
			List<string> result = File.ReadAllLines(filepath).ToList().Skip(1).ToList();
			return result;
		}


        // Take the result of the LoadInventory function, split the lines into an array,
        // then map the array to a Car instance. Add the car instance to a list of things
        // that will be returned, and once complete return them all to the calling function
		public static List<Car> GetCars(string filepath)
		{
			List<Car> result = new List<Car>();
			List<string> inventory = LoadInventory(filepath);

			foreach (string vehicle in inventory)
			{
				Car car = new Car();
				string[] carinfo = vehicle.Split(",");
				car.InventoryNumber = carinfo[0];
				car.Year = Convert.ToDouble(carinfo[1]);
				car.Make = carinfo[2];
				car.Model = carinfo[3];
				car.Mileage = Convert.ToDouble(carinfo[4]);
				car.Price = Convert.ToDecimal(carinfo[5]);

				result.Add(car);
			}

			return result;
		}

	}
}