Easiest way to read from and write to files

Question

There are a lot of different ways to read and write files  text files  not binary  in C     I just need something that is easy and uses the least amount of code  because I am going to be working with files a lot in my project  I only need something for string since all I need is to read and write strings

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using  var file   File Create  pricequote txt                                                 using  var file   File OpenRead  pricequote txt                         Simple  easy and also disposes cleans up the object once you are done with it

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It s good when reading to use the OpenFileDialog control to browse to any file you want to read  Find the code below   Don t forget to add the following using statement to read files  using System IO   private void button1 Click object sender  EventArgs e        if  openFileDialog1 ShowDialog      DialogResult OK                 textBox1 Text   File ReadAllText openFileDialog1 FileName               To write files you can use the method File WriteAllText

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class Program                 public static void Main                            To write in a txt file              File WriteAllText  C   Users  HP  Desktop  c file txt    Hello and Welcome                  To Read from a txt file  amp  print on console              string  copyTxt   File ReadAllText  C   Users  HP  Desktop  c file txt                 Console Out WriteLine   0   copyTxt

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FileStream fs   new FileStream txtSourcePath Text FileMode Open  FileAccess Read   using StreamReader sr   new StreamReader fs        using  StreamWriter sw   new StreamWriter Destination                    sw writeline  Your text

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In addition to File ReadAllText  File ReadAllLines  and File WriteAllText  and similar helpers from File class  shown in another answer you can use StreamWriter StreamReader classes   Writing a text file   using StreamWriter writetext   new StreamWriter  write txt          writetext WriteLine  writing in text file        Reading a text file   using StreamReader readtext   new StreamReader  readme txt         string readText   readtext ReadLine        Notes    You can use readtext Dispose   instead of using  but it will not close file reader writer in case of exceptions Be aware that relative path is relative to current working directory  You may want to use construct absolute path  Missing using Close is very common reason of  why data is not written to file

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AlexeiLevenkov pointed me at another  easiest way  namely the extension method  It takes just a little coding  then provides the absolute easiest way to read write  plus it offers the flexibility to create variations according to your personal needs  Here is a complete example   This defines the extension method on the string type  Note that the only thing that really matters is the function argument with extra keyword this  that makes it refer to the object that the method is attached to  The class name does not matter  the class and method must be declared static   using System IO   File  Directory  Path  namespace Lib            lt summary gt          Handy string methods          lt  summary gt      public static class Strings                    lt summary gt              Extension method to write the string Str to a file              lt  summary gt               lt param name  Str  gt  lt  param gt               lt param name  Filename  gt  lt  param gt          public static void WriteToFile this string Str  string Filename                        File WriteAllText Filename  Str               return                        of course you could add other useful string methods           end class    end ns   This is how to use the string extension method  note that it refers automagically to the class Strings   using Lib    extension  method s  for string namespace ConsoleApp Sandbox       class Program               static void Main string   args                         Hello World   WriteToFile   c  temp helloworld txt                return                    end class    end ns   I would never have found this myself  but it works great  so I wanted to share this  Have fun

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You re looking for the File  StreamWriter  and StreamReader classes

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Use File ReadAllText and File WriteAllText  MSDN example excerpt     Create a file to write to  string createText    quot Hello and Welcome quot    Environment NewLine  File WriteAllText path  createText            Open the file to read from  string readText   File ReadAllText path

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Or  if you are really about lines   System IO File also contains a static method WriteAllLines  so you could do   IList lt string gt  myLines   new List lt string gt           line1        line2        line3       File WriteAllLines    foo   myLines

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The easiest way to read from a file and write to a file     Read from a file string something   File ReadAllText  C   Rfile txt       Write to a file using  StreamWriter writer   new StreamWriter  Wfile txt          writer WriteLine something

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private void Form1 Load object sender  EventArgs e                  Write a file         string text    The text inside the file            System IO File WriteAllText  file name txt   text              Read a file         string read   System IO File ReadAllText  file name txt            MessageBox Show read     Display text in the file

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These are the best and most commonly used methods for writing to and reading from files   using System IO   File AppendAllText sFilePathAndName  sTextToWrite    add text to existing file File WriteAllText sFilePathAndName  sTextToWrite    will overwrite the text in the existing file  If the file doesn t exist  it will create it   File ReadAllText sFilePathAndName     The old way  which I was taught in college was to use stream reader stream writer  but the File I O methods are less clunky and require fewer lines of code  You can type in  File   in your IDE  make sure you include the System IO import statement  and see all the methods available  Below are example methods for reading writing strings to from text files   txt   using a Windows Forms App   Append text to an existing file   private void AppendTextToExistingFile Click object sender  EventArgs e        string sTextToAppend   txtMainUserInput Text        first  check to make sure that the user entered something in the text box      if  sTextToAppend          sTextToAppend    null       MessageBox Show  You did not enter any text  Please try again         else               string sFilePathAndName   getFileNameFromUser      opens the file dailog  user selects a file   txt filter  and the method returns a path filename txt as string          if  sFilePathAndName          sFilePathAndName    null                          MessageBox Show  You cancalled      DO NOTHING                   else                        sTextToAppend      r n    sTextToAppend    create a new line for the new text             File AppendAllText sFilePathAndName  sTextToAppend               string sFileNameOnly   sFilePathAndName Substring sFilePathAndName LastIndexOf         1               MessageBox Show  Your new text has been appended to     sFileNameOnly              end nested if else        end if else     end method AppendTextToExistingFile Click   Get file name from the user via file explorer open file dialog  you will need this to select existing files    private string getFileNameFromUser    returns file path name       string sFileNameAndPath           OpenFileDialog fd   new OpenFileDialog        fd Title    Select file       fd Filter    TXT files   txt       fd InitialDirectory   Environment CurrentDirectory      if  fd ShowDialog      DialogResult OK                sFileNameAndPath    fd FileName ToString               return sFileNameAndPath     end method getFileNameFromUser   Get text from an existing file   private void btnGetTextFromExistingFile Click object sender  EventArgs e        string sFileNameAndPath   getFileNameFromUser        txtMainUserInput Text   File ReadAllText sFileNameAndPath     display the text

[c#] Easiest way to read from and write to files

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