StreamWriter.Write doesn't write to file; no exception thrown

Question

My code in C# (asp.net MVC)

StreamWriter tw = new StreamWriter("C:\\mycode\\myapp\\logs\\log.txt");  // write a line of text to the file tw.Write("test"); 

The file is created but is empty. No exception is thrown. I have never seen this before and I am stuck here; I just need to write some debugging output.

Please advise.

Answer 1

StreamWriter is buffered by default, meaning it won't output until it receives a Flush() or Close() call.

You can change that by setting the AutoFlush property, if you want to. Otherwise, just do:

StreamWriter tw = new StreamWriter("C:\\mycode\\myapp\\logs\\log.txt");  // write a line of text to the file tw.Write("test"); tw.Close();  //or tw.Flush(); 

Answer 2

Neither flushed nor closed nor disposed. try this

using (StreamWriter tw = new StreamWriter(@"C:\mycode\myapp\logs\log.txt")) {     // write a line of text to the file     tw.Write("test");     tw.Flush(); } 

or my preference

using (FileStream fs = new FileStream( @"C:\mycode\myapp\logs\log.txt"                                      , FileMode.OpenOrCreate                                      , FileAccess.ReadWrite)           ) {     StreamWriter tw = new StreamWriter(fs);     tw.Write("test");     tw.Flush(); }