C# - Making a Process.Start wait until the process has start-up

Question

I need to make sure that a process is running before moving on with a method.

The statement is:

Process.Start(\"popup.exe\");

Can y

Answer 1

I used the EventWaitHandle class. On the parent process, create a named EventWaitHandle with initial state of the event set to non-signaled. The parent process blocks until the child process calls the Set method, changing the state of the event to signaled, as shown below.

Parent Process:

using System;
using System.Threading;
using System.Diagnostics;

namespace MyParentProcess
{
    class Program
    {
        static void Main(string[] args)
        {
            EventWaitHandle ewh = null;
            try
            {
                ewh = new EventWaitHandle(false, EventResetMode.AutoReset, "CHILD_PROCESS_READY");

                Process process = Process.Start("MyChildProcess.exe", Process.GetCurrentProcess().Id.ToString());
                if (process != null)
                {
                    if (ewh.WaitOne(10000))
                    {
                        // Child process is ready.
                    }
                }
            }
            catch(Exception exception)
            { }
            finally
            {
                if (ewh != null)
                    ewh.Close();
            }
        }
    }
}

Child Process:

using System;
using System.Threading;
using System.Diagnostics;

namespace MyChildProcess
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                // Representing some time consuming work.
                Thread.Sleep(5000);

                EventWaitHandle.OpenExisting("CHILD_PROCESS_READY")
                    .Set();

                Process.GetProcessById(Convert.ToInt32(args[0]))
                    .WaitForExit();
            }
            catch (Exception exception)
            { }
        }
    }
}