Passing variables to timer event in a class from Form1 Butto

Question

I have a method in a class that receives and returns multiple parameters from/to Form1. I need to use a timed event to execute some code using those parameters. I have arranged this simplified code to show the dynamic:

class Motor
{
    public static System.Timers.Timer _timer;
    int valReg = 30;

    public void PID(decimal _actualSpeed, Decimal _speedRequest, out Decimal _pwmAuto, out decimal _preValReg)
    {

        _timer = new System.Timers.Timer();
        _timer.Interval = (3000);
        _timer.Elapsed += new System.Timers.ElapsedEventHandler(_timerAutoset);
        _timer.Enabled = true;
        // {....}
        _pwmAuto = valReg;
        _preValReg = valReg - 1;
    }
    static void _timerAutoset(object sender, System.Timers.ElapsedEventArgs e)
    {
        /* here I need to work with:
         _actualSpeed
         _speedRequest
         _pwmAuto
         _preValReg
        and send back the last two variables
         */
    }    
}

This is how I pass and receive the variables from Form1 button :

        private void button4_Click(object sender, EventArgs e)
        {
        // some code ................
        Motor mtr = new Motor();
        mtr.PID(speedRequest, actualSpeed, out pwmAuto, out xxx);
        //..more code

How can I pass/get back those parameters to/from _timerAutoset event?

Vulpes · Answer

Well, the only way I can think of for the _timerAutoset handler to access those parameters is to store them in private static fields of the Motor class. However, if I'm understanding it correctly, the PID method will need to be suspended until the timer event has been stopped, otherwise it will return immediately before any processing has take place. An easy way to do this is to use a ManualResetEvent. So, taking all this into account, the changes needed to the Motor class will be as follows: class Motor { public static System.Timers.Timer _timer; int valReg = 30; // if this is being altered by _timerAutoset it will need to be static // add these static fields static decimal actualSpeed; static decimal speedRequest; static decimal pwmAuto; static decimal preValReg; static ManualResetEvent mre = new ManualResetEvent(false); // not signaled initially public void PID(decimal _actualSpeed, Decimal _speedRequest, out Decimal _pwmAuto, out decimal _preValReg) { // set static fields actualSpeed = _actualSpeeed; speedRequest = _speedRequest; pwmAuto = _pwmAuto; preValReg = _preValReg _timer = new System.Timers.Timer(); _timer.Interval = (3000); _timer.Elapsed += new System.Timers.ElapsedEventHandler(_timerAutoset); _timer.Enabled = true; mre.WaitOne(); // wait for signal // {....} _pwmAuto = valReg; _preValReg = valReg - 1; mre.Reset(); // reset to not signaled } static void _timerAutoset(object sender, System.Timers.ElapsedEventArgs e) { /* here I need to work with the static fields actualSpeed speedRequest pwmAuto preValReg and send back the last two variables */ // when it's time to stop timer and signal back to PID method so it can proceed _timer.Stop(); mre.Set(); // set to signaled }