c# - Start a stopwatch from specified time -

im trying start stopwatch given time (decimal value pulled database). however, because stopwatch.elapsed.add returns new timespan rather modify stopwatch, can't work out best way forward.

var offsettimestamp = new system.timespan(0,0,0).add(timespan.fromseconds((double)jd.actualtime)); stopwatch.elapsed.add(offsettimestamp); stopwatch.start(); 

any ideas how can this? cheers

the normal stopwatch not support initialization offset timespan , timespan struct, therefore elapsed immutable. write wrapper around stopwatch:

public class stopwatchwithoffset {     private stopwatch _stopwatch = null;     timespan _offsettimespan;      public stopwatchwithoffset(timespan offsetelapsedtimespan)     {         _offsettimespan = offsetelapsedtimespan;         _stopwatch = new stopwatch();     }      public void start()     {         _stopwatch.start();     }      public void stop()     {         _stopwatch.stop();     }      public timespan elapsedtimespan     {                 {             return _stopwatch.elapsed + _offsettimespan;         }         set         {             _offsettimespan = value;         }     } } 

now can add start-timespan:

var offsettimestamp = timespan.fromhours(1); var watch = new stopwatchwithoffset(offsettimestamp); watch.start(); system.threading.thread.sleep(300);  console.writeline(watch.elapsedtimespan);// 01:00:00.2995983