How to Save Console WriteLine Output to Text File

Question

I have a program which outputs various results onto a command line console   How do I save the output to a text file using a StreamReader or other techniques   System Collections Generic IEnumerable lt String gt  lines   File ReadAllLines   C  Test ntfs8 txt     foreach  String r in lines Skip 1         String   token   r Split           String   datetime   token 0  Split           String timeText   datetime 4       String actions   token 2       Console WriteLine  The time for this array is      timeText       Console WriteLine token 7        Console WriteLine actions       MacActions actions       x   1      Console WriteLine                                                         if  x    2        Console WriteLine  The selected time does not exist within the log files        System IO StreamReader reader     string sRes   reader ReadToEnd    StreamWriter SW  SW   File CreateText  C   temp  test bodyfile    SW WriteLine sRes   SW Close    Console WriteLine  File Created    reader Close

User · Answer

Use Console SetOut to redirect to a TextWriter as described here  http   msdn microsoft com en-us library system console setout aspx

User · Answer

For the question      How to save Console Writeline Outputs   to text file    I would use Console SetOut as others have mentioned     However  it looks more like you are keeping track of your program flow  I would  consider using Debug or Trace for keeping track of the program state   It works similar the console except you have more control over your input such as WriteLineIf    Debug will only operate when in debug mode where as Trace will operate in both debug or release mode   They both allow for listeners such as output files or the console   TextWriterTraceListener tr1   new TextWriterTraceListener System Console Out   Debug Listeners Add tr1    TextWriterTraceListener tr2   new TextWriterTraceListener System IO File CreateText  Output txt     Debug Listeners Add tr2     -http   support microsoft com kb 815788

User · Answer

Try this example from this article - Demonstrates redirecting the Console output to a file  using System  using System IO   static public void Main          FileStream ostrm      StreamWriter writer      TextWriter oldOut   Console Out      try               ostrm   new FileStream     Redirect txt   FileMode OpenOrCreate  FileAccess Write           writer   new StreamWriter  ostrm             catch  Exception e                Console WriteLine   Cannot open Redirect txt for writing            Console WriteLine  e Message           return            Console SetOut  writer       Console WriteLine   This is a line of text        Console WriteLine   Everything written to Console Write   or        Console WriteLine   Console WriteLine   will be written to a file        Console SetOut  oldOut       writer Close        ostrm Close        Console WriteLine   Done

User · Answer

Create a class Logger code below   replace Console WriteLine with Logger Out  At the end write to a file the string Log  public static class Logger                public static StringBuilder LogString   new StringBuilder          public static void Out string str                  Console WriteLine str            LogString Append str  Append Environment NewLine

User · Answer

do you want to write code for that or just use command-line feature  command redirection  as follows   app exe    output txt  as demonstrated here  http   discomoose org 2006 05 01 output-redirection-to-a-file-from-the-windows-command-line   Archived at archive org   EDIT  link dead  here s another example  http   pcsupport about com od commandlinereference a redirect-command-output-to-file htm

User · Answer

Necromancing   I usually just create a class  which I can wrap around main in an IDisposable   So I can log the console output to a file without modifying the rest of the code    That way  I have the output in both the console and for later reference in a text-file  public class Program        public static async System Threading Tasks Task Main string   args                using  ConsoleOutputMultiplexer co   new ConsoleOutputMultiplexer                             Do something here             System Console WriteLine  quot Hello Logfile and Console 1   quot                System Console WriteLine  quot Hello Logfile and Console 2   quot                System Console WriteLine  quot Hello Logfile and Console 3   quot                 End Using co            System Console WriteLine  quot  --- Press any key to continue ---  quot            System Console ReadKey             await System Threading Tasks Task CompletedTask           End Task Main      with public class MultiTextWriter       System IO TextWriter        protected System Text Encoding m encoding      protected System Collections Generic IEnumerable lt System IO TextWriter gt  m writers        public override System Text Encoding Encoding   gt  this m encoding        public override System IFormatProvider FormatProvider               get                       return base FormatProvider                        public MultiTextWriter System Collections Generic IEnumerable lt System IO TextWriter gt  textWriters  System Text Encoding encoding                this m writers   textWriters          this m encoding   encoding              public MultiTextWriter System Collections Generic IEnumerable lt System IO TextWriter gt  textWriters            this textWriters  textWriters GetEnumerator   Current Encoding                public MultiTextWriter System Text Encoding enc  params System IO TextWriter   textWriters            this  System Collections Generic IEnumerable lt System IO TextWriter gt  textWriters  enc                public MultiTextWriter params System IO TextWriter   textWriters            this  System Collections Generic IEnumerable lt System IO TextWriter gt  textWriters                public override void Flush                 foreach  System IO TextWriter thisWriter in this m writers                        thisWriter Flush                         public async override System Threading Tasks Task FlushAsync                 foreach  System IO TextWriter thisWriter in this m writers                        await thisWriter FlushAsync                       await System Threading Tasks Task CompletedTask              public override void Write char   buffer  int index  int count                foreach  System IO TextWriter thisWriter in this m writers                        thisWriter Write buffer  index  count                         public override void Write System ReadOnlySpan lt char gt  buffer                foreach  System IO TextWriter thisWriter in this m writers                        thisWriter Write buffer                         public async override System Threading Tasks Task WriteAsync char   buffer  int index  int count                foreach  System IO TextWriter thisWriter in this m writers                        await thisWriter WriteAsync buffer  index  count                      await System Threading Tasks Task CompletedTask              public async override System Threading Tasks Task WriteAsync System ReadOnlyMemory lt char gt  buffer  System Threading CancellationToken cancellationToken   default                foreach  System IO TextWriter thisWriter in this m writers                        await thisWriter WriteAsync buffer  cancellationToken                      await System Threading Tasks Task CompletedTask              protected override void Dispose bool disposing                foreach  System IO TextWriter thisWriter in this m writers                        thisWriter Dispose                          public async override System Threading Tasks ValueTask DisposeAsync                 foreach  System IO TextWriter thisWriter in this m writers                        await thisWriter DisposeAsync                       await System Threading Tasks Task CompletedTask             public override void Close                  foreach  System IO TextWriter thisWriter in this m writers                        thisWriter Close                                End Sub Close         End Class MultiTextWriter     public class ConsoleOutputMultiplexer       System IDisposable        protected System IO TextWriter m oldOut      protected System IO FileStream m logStream      protected System IO StreamWriter m logWriter       protected MultiTextWriter m multiPlexer        public ConsoleOutputMultiplexer                 this m oldOut   System Console Out           try                       this m logStream   new System IO FileStream  quot   Redirect txt quot   System IO FileMode OpenOrCreate  System IO FileAccess Write               this m logWriter   new System IO StreamWriter this m logStream               this m multiPlexer   new MultiTextWriter this m oldOut Encoding  this m oldOut  this m logWriter                System Console SetOut this m multiPlexer                     catch  System Exception e                        System Console WriteLine  quot Cannot open Redirect txt for writing quot                System Console WriteLine e Message               return                      End Constructor        void System IDisposable Dispose                 System Console SetOut this m oldOut            if  this m multiPlexer    null                        this m multiPlexer Flush                if  this m logStream    null                  this m logStream Flush                 this m multiPlexer Close                               if this m logStream    null              this m logStream Close             End Sub Dispose         End Class ConsoleOutputMultiplexer

User · Answer

Using only configuration in your app config        lt system diagnostics gt            lt trace autoflush  true  indentsize  4  gt                  lt listeners gt                   lt add name  consoleListener  type  System Diagnostics ConsoleTraceListener   gt                lt  --              lt add name  logListener  type  System Diagnostics TextWriterTraceListener  initializeData  TextWriterOutput log    gt                lt add name  EventLogListener  type  System Diagnostics EventLogTraceListener  initializeData  MyEventLog   gt               -- gt                 lt  --               Remove the Default listener to avoid duplicate messages               being sent to the debugger for display              -- gt                lt remove name  Default    gt                 lt  listeners gt            lt  trace gt      lt  system diagnostics gt    For testing  you can use DebugView before running the program  then we can easily view all of the log messages   References  http   blogs msdn com b jjameson archive 2009 06 18 configuring-logging-in-a-console-application aspx http   www thejoyofcode com from zero to logging with system diagnostics in 15 minutes aspx Redirect Trace output to Console Problem redirecting debug output to a file using trace listener https   ukadcdiagnostics codeplex com  http   geekswithblogs net theunstablemind archive 2009 09 09 adventures-in-system diagnostics aspx

User · Answer

Based in the answer by WhoIsNinja   This code will output both into the Console and into a Log string that can be saved into a file  either by appending lines to it or by overwriting it   The default name for the log file is  Log txt  and is saved under the Application path   public static class Logger       public static StringBuilder LogString   new StringBuilder        public static void WriteLine string str                Console WriteLine str           LogString Append str  Append Environment NewLine             public static void Write string str                Console Write str           LogString Append str              public static void SaveLog bool Append   false  string Path      Log txt                 if  LogString    null  amp  amp  LogString Length  gt  0                        if  Append                                using  StreamWriter file   System IO File AppendText Path                                         file Write LogString ToString                         file Close                        file Dispose                                                else                               using  System IO StreamWriter file   new System IO StreamWriter Path                                         file Write LogString ToString                         file Close                        file Dispose                                                                       Then you can use it like this   Logger WriteLine                                                                Logger Write  Loading  AttendPunch   PadRight 35         Logger WriteLine  OK      Logger SaveLog true      lt - default  false    true  Append the log to an existing file

User · Answer

Try if this works   FileStream filestream   new FileStream  out txt   FileMode Create   var streamwriter   new StreamWriter filestream   streamwriter AutoFlush   true  Console SetOut streamwriter   Console SetError streamwriter

[c#] How to Save Console.WriteLine Output to Text File

Examples related to c#