Question

I have a WPF Caliburn.Micro application, and I use MediaPlayer class to play audio. I implemented Play, Stop, and Pause functionality, but I don’t see a method for Resume (after Pause) in MediaPlayer. Could you please help me with this?

Here is some of my code:

       public void Play()
   {
       try
       {
           var audio = Tpv.GetAudio(SelectedTpv.TpvId);
           var file = Path.GetTempFileName().Replace(".tmp", ".wma");
           File.WriteAllBytes(file, audio);

           Player.Open(new Uri(file, UriKind.Absolute));
           Player.Play();
           IsPlaying = true;

       }
       catch (Exception ex)
       {
           MessageBox.Show(String.Format("Failed to play audio:\n{0}", ex.Message), "Failure",
            MessageBoxButton.OK, MessageBoxImage.Error);

           Console.WriteLine(ex.Message);
       }        
   }

Thanks.

Answer 1

I’m pretty sure that Play is also supposed to handle resume functionality. According to the MSDN for System.Windows.Media.MediaPlayer the Play method is supposed to “Play media from the current Position”. This means that when you are playing media from the beginning, the position is 0. If you pause, then the media will be paused at a certain position. Pressing play again should resume playback from the same position that you paused the media on.

Edit:

Based on the code update you provided, it looks like your issue is that you are loading the file each time you click play. This would cause any previous pause information to be erased, and would treat the file as being brand new each time. You should put some sort of check in there to say that if the file is not already loaded, then load it. Otherwise, your Play method should just call Player.Play() to resume.

I would also note that you would need to also call Player.Close when you switch the selected item. This would let the Play method know that it needs to load a different file.

public void Play()
{
   try
   {
       // Check if the player already has a file loaded, otherwise load it.
       if(Player.Source == null) { 
           var audio = Tpv.GetAudio(SelectedTpv.TpvId);
           var file = Path.GetTempFileName().Replace(".tmp", ".wma");
           File.WriteAllBytes(file, audio);

           Player.Open(new Uri(file, UriKind.Absolute));
       }

       Player.Play();
       IsPlaying = true;

   }
   catch (Exception ex)
   {
       MessageBox.Show(String.Format("Failed to play audio:\n{0}", ex.Message), "Failure",
        MessageBoxButton.OK, MessageBoxImage.Error);

       Console.WriteLine(ex.Message);
   }        
}