Start a stopwatch from specified time

Question

Im trying to start a stopwatch from a given time (decimal value pulled from a database). However, because the Stopwatch.Elapsed.Add returns a new timespan rather than modify

Answer 1

I think you want to start your Stopwatch after a certain mount of time specified by a TimeSpan. I wonder why you don't want to start your Stopwatch at a time specified by a DateTime instead?

public class MyStopwatch : Stopwatch
{
    public void Start(long afterMiliseconds)
    {
        Timer t = new Timer() { Interval = 1 };
        int i = 0;
        t.Tick += (s, e) =>
        {
            if (i++ == afterMiliseconds)
            {
                Start();
                t.Stop();
            }
        };
        t.Start();
    }
}
//use it
var offsetTimeStamp = new System.TimeSpan(0,0,0).Add(TimeSpan.FromSeconds((double)jd.ActualTime));
myStopwatch.Start((long)offsetTimeStamp.TotalMiliseconds);