c# - Slider progress bar with MediaElement Windows Phone 8.1 -

i working within windows phone 8.1 (non silverlight) application. have mediaelement audioplayer plays audio files. have slider audioplayerseek want 'hooked' mediaelement, moves audio playing.

i have gone through this tutorial word word, still can't work. when play audio (clicking on item in listview), audio plays, slider doesn't move!

private dispatchertimer _timer; private bool _sliderpressed = false;  // constructor public mainpage() {     initializecomponent();     navigationcachemode = navigationcachemode.required;     audioplayerseek.valuechanged += audioplayerseek_valuechanged;     initializeaudiorecording();     datacontext = app.viewmodel; }  // called when select audio file in listview private async void selector_onselectionchanged(object sender, selectionchangedeventargs e) {     // cast xaml listview     var listview = sender listview;      // verify have listview     if (listview == null) { return; }      var listvmitem = listview.selecteditem recordfilevm;      if (listvmitem != null)     {         var file2 = await _finalstoragefolder.getfileasync(listvmitem.filename);         var stream = (await file2.openreadasync()).asstream().asrandomaccessstream();         audioplayer.setsource(stream, file2.contenttype);         timespan recordingtime = audioplayer.naturalduration.timespan;         audioplayerseek.maximum = recordingtime.totalseconds;         audioplayerseek.smallchange = 1;         audioplayerseek.largechange = math.min(10, recordingtime.seconds / 10);         audioplayer.mediaopened += audioplayer_mediaopened;         audioplayer.currentstatechanged += audioplayer_currentstatechanged;         audioplayer.play();     }      // clear selection     listview.selecteditem = null; }  private double sliderfrequency(timespan timevalue) {     double stepfrequency = -1;      double absvalue = (int)math.round(timevalue.totalseconds, midpointrounding.awayfromzero);      stepfrequency = (int)(math.round(absvalue / 100));      if (timevalue.totalminutes >= 10 && timevalue.totalminutes < 30)     {         stepfrequency = 10;     }     else if (timevalue.totalminutes >= 30 && timevalue.totalminutes < 60)     {         stepfrequency = 30;     }     else if (timevalue.totalhours >= 1)     {         stepfrequency = 60;     }      if (stepfrequency == 0) stepfrequency += 1;      if (stepfrequency == 1)     {         stepfrequency = absvalue / 100;     }      return stepfrequency; }  void audioplayerseek_valuechanged(object sender, rangebasevaluechangedeventargs e) {     if (!_sliderpressed)     {         audioplayer.position = timespan.fromseconds(e.newvalue);     } }  private void setuptimer() {     _timer = new dispatchertimer();     _timer.interval = timespan.fromseconds(audioplayerseek.stepfrequency);     starttimer(); }  private void _timer_tick(object sender, object e) {     if (!_sliderpressed)     {         audioplayerseek.value = audioplayer.position.totalseconds;     } }  private void starttimer() {     _timer.tick += _timer_tick;     _timer.start(); } 

i believe relevant code. can please tell me how can synchronize slider moves playing media (audio).

thank you.

you setting things in wrong order. try changing this:

 if (listvmitem != null) {     var file2 = await _finalstoragefolder.getfileasync(listvmitem.filename);     var stream = (await file2.openreadasync()).asstream().asrandomaccessstream();     audioplayer.mediaopened += audioplayer_mediaopened;     audioplayer.currentstatechanged += audioplayer_currentstatechanged;     audioplayer.setsource(stream, file2.contenttype);     audioplayer.play(); } 

and move these calls mediaopened handler:

    timespan recordingtime = audioplayer.naturalduration.timespan;     audioplayerseek.maximum = recordingtime.totalseconds;     audioplayerseek.smallchange = 1;     audioplayerseek.largechange = math.min(10, recordingtime.seconds / 10);