How to read write files in Net Core

Question

What are the options to read write files in  Net Core   I am working on my first  Net Core app and looking for  File Read  File Write  functions  System IO from  Net  alternatives

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To write   using  System IO StreamWriter file   new System IO StreamWriter System IO File Create filePath  Dispose           file WriteLine  your text here

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Use   File ReadAllLines  My textfile txt      Reference  https   msdn microsoft com pt-br library s2tte0y1 v vs 110  aspx

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FileStream fileStream   new FileStream  file txt   FileMode Open   using  StreamReader reader   new StreamReader fileStream         string line   reader ReadLine        Using the System IO FileStream and System IO StreamReader  You can use System IO BinaryReader or System IO BinaryWriter as well

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Works in Net Core 2 1      var file   Path Combine Directory GetCurrentDirectory     wwwroot    email    EmailRegister htm         string SendData   System IO File ReadAllText file

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public static void Copy String SourceFile  String TargetFile                 FileStream fis   null          FileStream fos   null               try                               Console Write     Try No      a        Write from     SourceFile     to     TargetFile      n                     fis   new FileStream SourceFile  FileMode Open  FileAccess ReadWrite                   fos   new FileStream TargetFile  FileMode Create  FileAccess ReadWrite                    int intbuffer   5242880                  byte   b   new byte intbuffer                    int i                  while   i   fis Read b  0  intbuffer    gt  0                                        fos Write b  0  i                                      Console Write  Writing file       TargetFile     is successful  n                     break                            catch  Exception e                                Console Write  Writing file       TargetFile     is unsuccessful  n                    Console Write e                             finally                               if  fis    null                                        fis Close                                      if  fos    null                                        fos Close                                            The code above will read a big file and write to a new big file  The  intbuffer  value can be set in multiple of 1024  While both source and target file are open  it reads the big file by bytes and write to the new target file by bytes  It will not go out of memory

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For writing any Text to a file   public static void WriteToFile string DirectoryPath string FileName string Text                  Check Whether directory exist or not if not then create it         if  Directory Exists DirectoryPath                         Directory CreateDirectory DirectoryPath                      string FilePath   DirectoryPath          FileName            Check Whether file exist or not if not then create it new else append on same file         if   File Exists FilePath                         File WriteAllText FilePath  Text                     else                       Text      Environment NewLine  Text                File AppendAllText FilePath  Text                     For reading a Text from file  public static string ReadFromFile string DirectoryPath string FileName                if  Directory Exists DirectoryPath                         string FilePath   DirectoryPath          FileName              if  File Exists FilePath                                 return File ReadAllText FilePath                                   return             For Reference here this is the official microsoft document link

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Package  System IO FileSystem  System IO File ReadAllText  MyTextFile txt

[c#] How to read/write files in .Net Core?

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