如何使用C＃控制台同时进行输入和记录

Question

I have got a C# console application. I'm starting up another cmd process to use my NodeJS app (maybe any advise on how to do this otherwise? I have to run both at the same time, they work togheter).

Now the NodeJS process its output is streamed to my C# console.

private readonly Process _nodeProcess = new Process
{
    StartInfo =
    {
        FileName = "cmd",
        Arguments = @"/K Node server.js",
        UseShellExecute = false,
        RedirectStandardOutput = true
    }
};

internal void Start()
{
    _nodeProcess.Start();
    using (StreamReader reader = _nodeProcess.StandardOutput)
    {
        while (true)
        {
            string result = reader.ReadLine();
            Console.WriteLine(result);
        }
    }
}

This works fine. Now the problem here is, my Node logs something, but meanwhile I want to be able to give commands (input) on my console.

Example of my console output: (of course it uses a whole system, outputting real stuff..)

NodeJS process started
node log 1
node log 2
node log ...

and so on ..

But while it keeps outputting my log lines, I want to be able to type (for command input) with Console.ReadLine(); . This without the risk of typing inside the same line as an output line.

I would appreciate any help. Any suggestions on improving my code are welcome.

Answer 1

In your case it would be better to handle the output Asynchronously .

First add an Eventhandler to your Output:

_nodeProcess.OutputDataReceived += (s, e) => Console.WriteLine(e.Data);

Then add the line _nodeProcess.BeginOutputReadLine(); after _nodeProcess.Start();

Something like:

 _nodeProcess.OutputDataReceived += (s, e) => Console.WriteLine(e.Data);
 _nodeProcess.Start();
 _nodeProcess.BeginOutputReadLine();

 var line = Console.ReadLine();
 while (line != null && line.ToLower() != "exit")
 {
      line = Console.ReadLine();
 }
 _nodeProcess.Close();