Launch a command line process multiple times

Question

I'd like to launch a command line app multiple times and be told when each instance is finished (eg: exits). I've tried starting a process:

ProcessStartInfo startInfo = new ProcessStartInfo("c:mycmdline.exe");
proc = Process.Start(startInfo);
proc.WaitForExit();

But as can be imagined the process waits until it exits (as per the last line). Is there a way to get a non-blocking callback after each instance exits?

Take a look at [this answer](https://stackoverflow.com/a/10789196/2780791). — Alexei - check Codidact, Jan 01 '18 at 21:27
https://msdn.microsoft.com/en-us/library/fb4aw7b8(v=vs.110).aspx `To avoid blocking the current thread, use the Exited event.` — mjwills, Jan 01 '18 at 21:28
Put code into a class. The create multiple instances of the class. — jdweng, Jan 01 '18 at 22:07

score 0 · Answer 1 · answered Jan 02 '18 at 00:46

Here's an example of starting 3 processes as tasks and waiting for completion.

Task[] tasks = new Task[3];
        for (int i = 0; i < 3; i++)
        {

            int x = i;
            tasks[i] = Task.Factory.StartNew(() =>
            {

                // the processPath will be different based on whatever the value for i is
                ProcessStartInfo startInfo = null;
                switch (x)
                {
                    case 0:
                        startInfo = new ProcessStartInfo("c:\\windows\\notepad.exe");
                        break;
                    case 1:
                        startInfo = new ProcessStartInfo("c:\\windows\\explorer.exe");
                        break;
                    case 2:
                        startInfo = new ProcessStartInfo("c:\\windows\\regedit.exe");
                        break;
                }
                Process proc = Process.Start(startInfo);
                proc.WaitForExit();
            });
        }
        Task.WaitAll(tasks);

Launch a command line process multiple times

1 Answers1