Timer not going off

Question

I've got a timer in my game which is supposed to set off a Boolean back to false after a certain amount of time has passed it just doesn't seem to work despite me trying to debug the issue, although setting off the timer works perfectly fine. Any help with this would be much appreciated

for (int i = 0; i < cameras.Count; ++i)
            {
                DetectCamera camera = cameras[i];
                Stopwatch camTimer = new Stopwatch();

                if (player.InterferenceStart && player.EMPBoundingCircle.Intersects(camera.BoundingRectangle))
                    camTimer.Start();

                if(camTimer.ElapsedMilliseconds >= 2000.0f)
                {
                    camera.CameraInRange = false;
                    camTimer.Reset();
                }
                else if (camTimer.IsRunning)
                    camera.CameraInRange = true;
            }

Answer 1

You declare camTimer inside a method, as soon as your code exits this method the timer will be stopped and garbage collected. Also Your code probably calls this method every frame, so camTimer is created newly everyframe, so the time is never more than a few miliseconds.

Both of these problems can be solved by moving the camTimer out of the method and into the class containing the method. For example:

public class MyClass()
{
    StopWatch camTimer;

    public MyClass(){
        camTimer = new camTimer();
    }

    public void StartTimer(){
        camTimer.Start();
    }

    public void StopTimer(){
        camTimer.Reset(); //stops and sets time at 0, alternatively use stop to not set at 0 but keep time
    }

    public void DoSomethingWithCameras(){
            ...
            ...
            if(camTimer.ElapsedMilliseconds > 2000.0f){
                ...
                camTimer.Restart(); //starts measuring from 0 again

            }
            ...
    }
}