vb.net - WPF MediaElement opacity does not fade in gradually after changing source -

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i have wpf digital signage application displays slideshow of images and/or videos. i'm using single mediaelement object , transition handled storyboard animations of opacity property.

the image fades out smoothly, fade in doesn't. opacity appears stay @ 0 length of animation duration, , go 1 in 1 go.

private function getfadeinstory() storyboard     dim story new storyboard     dim fadeinanimation new doubleanimation {         .begintime = new timespan(0),         .from = 0,         .to = 1,         .duration = timespan.frommilliseconds(my.settings.fadeinduration)}     storyboard.settargetproperty(fadeinanimation, new propertypath(uielement.opacityproperty))      story.children.add(fadeinanimation)     return story end function  private function getfadeoutstory() storyboard     dim story new storyboard     dim fadeoutanimation new doubleanimation {         .begintime = new timespan(0),         .to = 0,         .from = 1,         .duration = timespan.frommilliseconds(my.settings.fadeoutduration)}     storyboard.settargetproperty(fadeoutanimation, new propertypath(uielement.opacityproperty))      story.children.add(fadeoutanimation)     return story end function  private sub displayslideimage()     dim slideuri uri = getnextslidepath()     dim s storyboard = getfadeoutstory()     addhandler s.completed, sub() finishedfadeout(slideuri)     storyboard.settarget(s, mediaelement)     s.begin() end sub  private sub finishedfadeout(slideuri uri)     mediaelement.source = slideuri      dim s storyboard = getfadeinstory()     storyboard.settarget(s, mediaelement)     s.begin() end sub

however, if mediaelement.source property not change, fade in , fade out work expected. i've tried without success:

  • wrapping mediaelement.source change in begininit / endinit statements
  • calling mediaelement.upatelayout after changing source
  • recreating mediaelement object every slide

any ideas?


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