Question

I’d like to redirect my process console output to file, while mantaining the utility of displaying it on the curretnly attached console.

The redirection is done easily with:

using (FileStream fs = new FileStream(TestLogName("Texture"), FileMode.Create, FileAccess.Write)) {
    Console.SetOut(new StreamWriter(fs));

    ...

    Console.Out.Flush();
}

But how I can achieve the same result while mantaining the console output on already attached console (de-facto duplicating the stream)?

Answer 1

You can sub-class TextWriter with a class that writes to a file and another TextWriter class. Then initialize an instance of this class with the current value of System.Console.Out.

var writer = new SplitWriter(Console.Out, @"c:\temp\logfile.txt");
Console.SetOut(writer);

SplitWriter then takes responsibility for writing to both the file and the original value of Console.Out.