播放wav比较简单,直接调用sndPlaySound就OK了,flags为9是重复播放
[DllImport("winmm.dll")]
  private extern static long sndPlaySound(string name, long flags);

下面的类可以播放MP3

[DllImport("winmm.dll")]
  private static extern int mciSendString
   (
   string lpstrCommand,
   string lpstrReturnString,
   int uReturnLength,
   int hwndCallback
   );

  [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
  public static extern int GetShortPathName
   (
    [MarshalAs(UnmanagedType.LPTStr)]    string path,
    [MarshalAs(UnmanagedType.LPTStr)]    StringBuilder shortPath,
    int shortPathLength
   );

  public void Play(string FileName)
  {
   StringBuilder shortPathTemp = new StringBuilder(255);
   int result = GetShortPathName(FileName, shortPathTemp, shortPathTemp.Capacity);
   string ShortPath = shortPathTemp.ToString();

   mciSendString("open "+ShortPath+" alias song","",0,0);
   mciSendString("play song","",0,0);
  }

  public void Stop()
  {
   mciSendString("stop song","",0,0);
  }

  public void Pause()
  {
   mciSendString("pause song","",0,0);
  }

  public void Close()
  {
   mciSendString("close song","",0,0);
  }