Joel Thoms' WebLog

There are many code samples that show you how to read from either StandardOutput or StandardError.  I've also run across a few more complicated code examples that spawn new processes to handle the reading of StandardOutput and StandardError.

Reading from StandardOut (or StandardError) is simple, all you need to do is set a property and create a simple loop...

proc.StartInfo.RedirectStandardOutput = true;

while (!proc.StandardOutput.EndOfStream) {
  string line = proc.StandardOutput.ReadLine();
  Console.WriteLine(">{0}", line);
}

System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.EnableRaisingEvents = false;
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.CreateNoWindow = true;
proc.StartInfo.RedirectStandardError = true;
proc.StartInfo.FileName = Environment.CurrentDirectory + @"\" + zipCmd;
proc.StartInfo.Arguments = String.Format("-rSv \"{0}\" .", zipFile);
proc.StartInfo.WorkingDirectory = directory;
proc.Start();

while (!proc.StandardOutput.EndOfStream || !proc.StandardError.EndOfStream) {
  string line;

  if (!proc.StandardOutput.EndOfStream
    && (line = proc.StandardOutput.ReadLine()) != null) {
    Console.WriteLine(">>{0}", line);
  }
  if (!proc.StandardError.EndOfStream
    && (line = proc.StandardError.ReadLine()) != null) {
    Console.WriteLine("!!{0}", line);
  }
}