How to read to end process output asynchronously in C#?

Question

I have problem with reading the output of one Process asynchronously in C#. I found some other similar questions on this site but they don\'t really help me. Here is what I

Answer 1

There are few things that are getting in the way of it...

The console app is probably using "\b" backspace to overwrite the percentage, its maybe not flushing to the stdout stream after every write, and the BeginOutputReadLine presumably waits for the end of line before giving you data.

See how you get on with reading process.StandardOutput.BaseStream via BeginRead (this code isn't proper async and the "\b"s will need processed differently if your putting progress in a form):

        while (true)
        {
            byte[] buffer = new byte[256];
            var ar = myProcess.StandardOutput.BaseStream.BeginRead(buffer, 0, 256, null, null);
            ar.AsyncWaitHandle.WaitOne();
            var bytesRead = myProcess.StandardOutput.BaseStream.EndRead(ar);
            if (bytesRead > 0)
            {
                Console.Write(Encoding.ASCII.GetString(buffer, 0, bytesRead));
            }
            else
            {
                myProcess.WaitForExit();
                break;
            }
        }