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Beginners Guide to File Handling in C#, .net


Make a new project in Visual Studio (Console App)
Add a new .cs file named as MySetting.cs, in that file copy paste the following code

 
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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace file_handling

{

 class MySettings

 {

  public int MyNumber {
   get;
   set;
  }

  public string MyData {
   get;
   set;
  }

  public void Save()

  {

   Stream stream = File.Create(SettingsFile);

   StreamWriter writer = new StreamWriter(stream, Encoding.UTF8);

   writer.WriteLine(MyNumber);

   writer.WriteLine(MyData);

   writer.Close();

   stream.Close();

  }

  public static MySettings Load()

  {

   if (!File.Exists(SettingsFile))

   return DefaultSetting;

   Stream stream = File.OpenRead(SettingsFile);

   StreamReader reader = new StreamReader(stream, Encoding.UTF8);

   string firstline = reader.ReadLine();

   string secondline = reader.ReadLine();

   reader.Close();

   return new MySettings

   {

    MyNumber = int.Parse(firstline),

    MyData = secondline

   };

  }

  private static string SettingsFolder

  {

   get

   {

    string folder = "C:\\File Handling";

    folder = Path.Combine(folder, "my company");

    folder = Path.Combine(folder, "my app");

    if (!Directory.Exists(folder))

    Directory.CreateDirectory(folder);

    return folder;

   }

  }

  private static string SettingsFile

  {

   get

   {

    return Path.Combine(SettingsFolder, "Settings.txt");

   }

  }

  private static MySettings DefaultSetting

  {

   get

   {

    return new MySettings

    {

     MyNumber = 0,

     MyData = " Harshit Rastogi ",

    };

   }

  }

 }

}

//In the program.cs file add the following code.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace file_handling

{

 class Program

 {

  static void Main(string[] args)

  {

   Console.WriteLine("Loading settings");

   MySettings settings = MySettings.Load();

   Console.WriteLine("My Number ={0}", settings.MyNumber);

   Console.WriteLine("My data ={0}", settings.MyData);

   Console.WriteLine();

   Console.WriteLine("upadating settings and printing at next run");

   settings.MyNumber++;

   settings.MyData += "\n " + DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToShortTimeString() + " " + DateTime.Now.Millisecond.ToString() + " ms ";

   settings.Save();

   Console.WriteLine("done");

   Console.ReadLine();

  }

 }

}


Yes you are done with file handling reading and writing.

 Here in above code we are making a new folder if it doesn't exist and if it exist we are using the content in the file to display on console screen, very easy.
Put a breakpoints, run and debug.
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