layStateChange

最简单的办法打断点，调测以下。下面是WMPSDK中给你整理的：
a> The   OpenStateChange   event   occurs   when   the   openState   property   changes   value.
Player.openState   Possible   Values:
PlaylistChanging\PlaylistLocating\MediaLoading\MediaOpening...

b> The   PlayStateChange   event   occurs   when   there   is   a   change   in   the   playState   property.
player.playState   Possible   Values:Stopped\Paused\Playing...

c> The   StatusChange   event   occurs   when   the   status   property   changes   value.
The   StatusChange   event   is   fired   whenever   this   property   changes   value.