ArrayList - Text file reader C# Exercise - C# Programming Course

 Exercise

ArrayList - Text file reader

 Objetive

provide your basic text file reader here, which displays 21 lines of text and allows the user to navigate using the up and down arrow keys, and exit using the ESC key.

Hints:
The text file reader should have three methods:

ReadFile (reads the text file and stores it in memory)
ShowMenu (clears the console, sets the top and bottom lines of the console [row 23], changes colors using Console.BackgroundColor, Console.ForegroundColor, ConsoleColor and Console.SetCursorPosition(column, row). Once the menu is prepared, remember to set the cursor in the second row).
ShowFrom (writes 21 lines, considering the position of the first line to write)
The main program logic should be as follows: ShowMenu, ShowFrom, ReadKey, ShowMenu, ShowFrom, ReadKey....

 Example Code

using System;
using System.IO;
using System.Collections;
namespace LectorTexto
{
    class Program
    {
        static ArrayList lista = new ArrayList();
        static bool fin;
        static int lineaDesde = 0, lineaHasta = 21;

        static void Main(string[] args)
        {
            Console.Write("Introduce nombre archivo: ");
            string nombreArchivo = Console.ReadLine();

            LeerFichero(nombreArchivo);

            do
            {
                MostrarMenu();
                EscribirLineas(lineaDesde, lineaHasta);
                LeerTecla();
            }
            while (!fin);

        }
        static void LeerTecla()
        {
            ConsoleKeyInfo cki;
            cki = Console.ReadKey();

            if (cki.Key == ConsoleKey.Escape)
            {
                fin = true;
            }
            else if (cki.Key == ConsoleKey.UpArrow)
            {
                if (lineaDesde > 0)
                {
                    lineaDesde--;
                    lineaHasta--;
                }
            }
            else if (cki.Key == ConsoleKey.DownArrow)
            {
                if (lineaHasta < lista.Count)
                {
                    lineaDesde++;
                    lineaHasta++;
                }
            }
            else if (cki.Key == ConsoleKey.PageUp)
            {
                if ((lineaHasta + 21) < lista.Count)
                {
                    lineaDesde += 21;
                    lineaHasta += 21;
                }
                else
                {
                    lineaDesde += lista.Count - lineaHasta;
                    lineaHasta += lista.Count - lineaHasta;
                }
            }
            else if (cki.Key == ConsoleKey.PageDown)
            {
                if ((lineaDesde - 21) > 0)
                {
                    lineaDesde -= 21;
                    lineaHasta -= 21;
                }
                else
                {
                    lineaHasta = lineaDesde + (21 - lineaDesde);
                    lineaDesde = 0;
                }
            }
        }

        static void EscribirLineas(int desde, int hasta)
        {
            for (int i = desde; i < hasta; i++)
            {
                Console.WriteLine(lista[i]);
            }
        }

        static void MostrarMenu()
        {
            Console.Clear();
            Console.BackgroundColor = ConsoleColor.Cyan;
            Console.ForegroundColor = ConsoleColor.Black;
            Console.WriteLine("    ==> Lector .txt --- Version 1.0");

            Console.SetCursorPosition(0, 23);
            Console.BackgroundColor = ConsoleColor.Cyan;
            Console.ForegroundColor = ConsoleColor.Black;
            Console.WriteLine("Pulse ESC para salir, fecha arriba y abajo para mover");

            Console.SetCursorPosition(0, 1);
            Console.BackgroundColor = ConsoleColor.Black;
            Console.ForegroundColor = ConsoleColor.White;
        }

        static void LeerFichero(string nombreArchivo)
        {
            if (!File.Exists(nombreArchivo))
            {
                Console.WriteLine("El fichero de texto no existe");
            }
            else
            {
                try
                {
                    StreamReader archivoTexto = File.OpenText(nombreArchivo);
                    string line;

                    do
                    {
                        line = archivoTexto.ReadLine();
                        if (line != null)
                            lista.Add(line);
                    }
                    while (line != null);

                    archivoTexto.Close();
                }
                catch (Exception e)
                {
                    Console.WriteLine("Error, " + e.Message);
                }
            }
        }
    }
}

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