Question

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Sharon has started to use both the stock details management and the file information viewer
features of the application. However, while using the file information viewer application, she
accidentally enters the path of a folder that does not exist on her computer. This caused the
application to stop responding. In addition, the format in which the stock details are displayed is
not clear. Therefore, she asks Hayley to modify the application so that:
The file information viewer does not stop responding in case a specified folder does not exist.
The stock details management application adds a line break before every stock details entry
whenever a new entry is added to the stock details file.
Write the code snippets that Hayley should use to address the preceding two requirements [10
Marks]

Answer 1

// Answer to question#38758, Programming, C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace Q38758
{
    class Program
    {
        static void Main(string[] args)
        {
            int line = 2;
            ConsoleKeyInfo key;
            Console.WriteLine("Choose action to do:\n");
            Console.WriteLine("Show files from directory *");
            Console.WriteLine("Write data to the stock file");
            Console.SetCursorPosition(32, 2);
            do
            {
                key = Console.ReadKey(true);
                switch (key.Key)
                {
                    case ConsoleKey.UpArrow:
                        Console.SetCursorPosition(32, line);
                        Console.Write(" ");
                        if (line == 2) line = 3;
                        else line--;
                        Console.SetCursorPosition(32, line);
                        Console.Write("*");
                        break;
                    case ConsoleKey.DownArrow:
                        Console.SetCursorPosition(32, line);
                        Console.Write(" ");
                        if (line == 3) line = 2;
                        else line++;
                        Console.SetCursorPosition(32, line);
                        Console.Write("*");
                        break;
                    case ConsoleKey.Escape: Environment.Exit(0); break;
                }
            } while (key.Key != ConsoleKey.Enter);
            Console.Clear();
            if (line == 2) showDir();
            else Write();
            Console.ReadKey();
        }
        public static void showDir()
        {
            Console.WriteLine(@"Enter the path to the directory:(Example -> D:\)");
            string filePass = Console.ReadLine(); //folder path
            if (System.IO.Directory.Exists(filePass)) // Does folder exist?
            {
                string[] fileNames = System.IO.Directory.GetFiles(filePass); //getting names of files
                Console.WriteLine("Directory: {0} contains {1} file(s)", filePass, fileNames.Length);
                for (int i = 0; i < fileNames.Length; i++)
                {
                    if (System.IO.File.Exists(fileNames[i]))
                    {
                        string name = "";
                        FileInfo fi = new FileInfo(fileNames[i]);
                        DateTime cr_date;
                        string date = "";
                        name = fileNames[i].Substring(filePass.Length);
                        cr_date = System.IO.File.GetCreationTime(fileNames[i]); //creation date
                        date = cr_date.Day + "." + cr_date.Month + "." + cr_date.Year;
                        Console.WriteLine(" {0,30} \t{1,10} byte(s) \t{2}", name, fi.Length, date);
                    }
                }
            }
            else Console.Write("Path doesn't exist");
        }
        public static void Write()
        {
            string fileName = "stockDetails.txt";
            Console.WriteLine(@"Please enter the directory of the stockDetails.txt:");
            string pass = Console.ReadLine(); //folder path
            if (!Directory.Exists(pass))
            {
                Console.WriteLine("Directory doesn't exist!");
                return;
            }
            FileStream fs; //object to write data
            if (!File.Exists(pass + fileName)) //File exist?
            {
                Console.Write(pass + fileName + " doesn't exist. We will create it.\n");
                fs = new FileStream(pass + fileName, FileMode.Create, FileAccess.Write);
                //Create file for writing
            }
            else
            {
                fs = new FileStream(pass + fileName, FileMode.Open, FileAccess.Write);
            }
            Console.WriteLine(fileName + " Successfully opened"); // Just open it
            string Data = "";
            Console.WriteLine("Please enter some data to write into the file:");
            Data = Console.ReadLine(); // Getting any input information from console
            Byte[] info = new UTF8Encoding(true).GetBytes(Data + "\r\n"); // Convert your data to Bytes
            fs.Seek(0, SeekOrigin.End); // Seeking for the last point in the file
            fs.Write(info, 0, info.Length); // Writing data
            fs.Close(); // Do not forget to close a file
            Console.WriteLine("Successfully done");
        }
    }
}