Question

Elina has started developing the application.She needs to ensure that the application meets following requirements.
1. When the application executes for first time ,it should perform following tasks.

*Display message to user to specify the path of file in which customer details are to be stored.
*Create customer details file at user-defined location.
*Create configuration file and store path of customer details file in configuration file.this configuration file needs to be used by application to retrieve location of customer details file.

Write code that Elina should use to enable application to perform preceding tasks.
2. the user should be able to save data to customer details file.Write code that Elina should use to save data to customer details file.
3.the user should be able to view the data stored in customer file. Write code that Elina should use to read the data stored in customer details file and display it to the user

Answer 1

Answer on Question #45804 – Programming – C#

Program.cs

using System;
using System.IO;
using System.Text;
namespace task
{
    class Program
    {
        static void Main(string[] args)
        {
            do
            {
                Console.Clear();
                Console.WriteLine("Choose appropriate line (ESC-EXIT):");
                switch (MyPatterns.Singleton.CreateMenu.ShowMenu("Settings", "Show Content", "Add data"))
                {
                    case 0:
                        Console.WriteLine("Please enter the path to the folder with Cus_detail.txt:");
                        string path = Console.ReadLine();
                        if (!Directory.Exists(path))
                        {
                            Console.WriteLine("The folder doesn't exist! Press any key to continue...");
                            Console.ReadKey();
                            continue;
                        }
                        StreamWriter swtr = new StreamWriter(Directory.GetCurrentDirectory() + @"\conf_file.txt", false, Encoding.GetEncoding(1251));
                        swtr.Write(path + @"\Cus_detail.txt");
                        swtr.Close();
                        if (!File.Exists(path + @"\Cus_detail.txt"))
                        {
                            FileStream fs = new FileStream(path + @"\Cus_detail.txt", FileMode.Create);
                            fs.Close();
                            Console.WriteLine("Please enter the path to the folder with Cus_detail.txt:");
                            path = Console.ReadLine();
                            if (!Directory.Exists(path))
                            {
                                Console.WriteLine("The folder doesn't exist! Press any key to continue...");
                                Console.ReadKey();
                                continue;
                            }
                        }
                        Console.WriteLine("Saved! Press any key to continue...");
                        Console.ReadKey();
                        break;
                    case 1:
                        if (!File.Exists(Directory.GetCurrentDirectory() + @"\conf_file.txt"))
                        {
                            StreamWriter strw = new StreamWriter(Directory.GetCurrentDirectory() + @"\conf_file.txt", false);
                            strw.Close();
                            Console.WriteLine("Configuration file is empty! Press any key...");
                            Console.ReadKey();
                            continue;
                        }
                        StreamReader strd = new StreamReader(Directory.GetCurrentDirectory() + @"\conf_file.txt");
                        string file_path = strd.ReadToEnd();
                        strd.Close();
                        if (File.Exists(file_path))
                        {
                            strd = new StreamReader(file_path);
                            Console.WriteLine("The content from file:");
                            Console.WriteLine("//////////////////////////////////////////");
                            Console.WriteLine(strd.ReadToEnd());
                            Console.WriteLine("//////////////////////////////////////////");
                            strd.Close();
                            Console.WriteLine("Press any key to continue...");
                            Console.ReadKey();
                        }
                        else
                        {
                            Console.WriteLine(file_path + " Doesn't exist. Press any key to continue...");
                            Console.ReadKey();
                            continue;
                        }
                        break;
                    case 2:
                        if (!File.Exists(Directory.GetCurrentDirectory() + @"\conf_file.txt"))
                        {
                            File.Create(Directory.GetCurrentDirectory() + @"\conf_file.txt");
                            Console.WriteLine("Configuration file is empty! Press any key...");
                            Console.ReadKey();
                            continue;
                        }
                        StreamReader strd1 = new StreamReader(Directory.GetCurrentDirectory() + @"\conf_file.txt");
                        string file_path1 = strd1.ReadToEnd();
                        strd1.Close();
                        if (File.Exists(file_path1))
                        {
                            StreamWriter swr = new StreamWriter(file_path1, true, Encoding.GetEncoding(1251));
                            Console.WriteLine("Please enter the data to add:");
                            swr.Write(Console.ReadLine());
                            swr.Close();
                            Console.WriteLine("Successfully saved. Press any key to continue...");
                            Console.ReadKey();
                        }
                        else
                        {
                            Console.WriteLine("Firstly Use \"Settings\" menu to fill config file.");
                            Console.ReadKey();
                        }
                        break;
                    default:
                        return;
                }
            } while (true);
        }
    }
}

Singleton.cs

using System;
namespace MyPatterns
{
    class Singleton
    {
        private static Singleton Menu;
        public static Singleton CreateMenu
        {
            get
            {
                if (Menu == null) Menu = new Singleton();
                return Menu;
            }
        }
        private Singleton()
        {
        }
        public int ShowMenu(params string[] lines)
        {
            if (lines.Length < 2) return -1;
            int starPos = 0;
            for (int i = 0; i < lines.Length; i++)
                if (lines[i].Length > starPos) starPos = lines[i].Length;
            starPos += 5;
            int upLinePos = Console.CursorTop + 1;
            int lowLinePos = upLinePos + lines.Length - 1;
            int curLine = upLinePos;
            Console.WriteLine();
            foreach (var line in lines)
            {
                Console.WriteLine(line);
            }
            Console.SetCursorPosition(starPos, upLinePos);
            Console.Write("*");
            ConsoleKeyInfo key;
            do
            {
                key = Console.ReadKey(true);
                switch (key.Key)
                {
                    case ConsoleKey.UpArrow:
                        Console.SetCursorPosition(starPos, curLine);
                        Console.Write(" ");
                        if (curLine == upLinePos) curLine = lowLinePos;
                        else curLine--;
                        Console.SetCursorPosition(starPos, curLine);
                        Console.Write("*");
                        break;
                    case ConsoleKey.DownArrow:
                        Console.SetCursorPosition(starPos, curLine);
                        Console.Write(" ");
                        if (curLine == lowLinePos) curLine = upLinePos;
                        else curLine++;
                        Console.SetCursorPosition(starPos, curLine);
                        Console.Write("*");
                        break;
                    case ConsoleKey.Escape:
                        Console.SetCursorPosition(0, lowLinePos + 2);
                        return -1;
                }
            } while (key.Key != ConsoleKey.Enter);
            Console.SetCursorPosition(0, lowLinePos + 2);
            return curLine - upLinePos;
        }
    }
}