以下是调用win32播放音乐的类:

public class PlaySound
    {
        /// <summary>
        /// 调用系统API
        /// </summary>
        /// <param name="lpszCommand"></param>
        /// <param name="lpszReturnString"></param>
        /// <param name="cchReturn"></param>
        /// <param name="hwndCallback"></param>
        /// <returns></returns>
        [DllImport("winmm.dll", EntryPoint = "mciSendString", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern IntPtr mciSendString(String lpszCommand, String lpszReturnString, int cchReturn, int hwndCallback);
        
        [DllImport("winmm.dll", EntryPoint = "mciGetErrorString", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern bool mciGetErrorString(int fdwError,ref String lpszErrorText, int UINT);
        private static String fileName;
        public static void LoadFile(string filePath)
        {
            isPlaying = false;
            fileName = filePath;
        }

        public static void Play()
        {
            PlaySound.mciSendString(String.Format("open {0} alias mysong", fileName), "", 0, 0);
            PlaySound.mciSendString("play mysong repeat", "", 0, 0);
            isPlaying = true;
        }
        public static bool isPlaying = false;
        public static void Stop()
        {
            PlaySound.mciSendString("stop mysong", "", 0, 0);
            isPlaying = false;
        }

        public static void Pause()
        {
            isPlaying = false;
            PlaySound.mciSendString("pause mysong", "", 0, 0);
        }

        public static string GetErrMsg()
        {
            string s=string.Empty;
            mciGetErrorString(1, ref s, 0);
            return s;
        }
    }

调用如下:

class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            PlaySound.LoadFile("等一分钟.mp3");
            PlaySound.Play();            
            while (true) ;
        }
    }

如何在一个应用程序中,创建多个线程,每个线程都同时播放:

    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {

            for (int i = 0; i < 3; i++)
            {
                Thread th = new Thread(new ThreadStart(PlaySong));
                th.SetApartmentState(ApartmentState.STA);
                th.Start();
                Thread.Sleep(1000 * 5);
            }
            while (true) ;
        }

        static void PlaySong()
        {
            PlaySound pl = new PlaySound();
            pl.LoadFile("等一分钟.mp3");
            pl.Play();
            while (true) ;
        }
    }

    public class PlaySound
    {
        public bool isPlaying = false;
        /// <summary>
        /// 调用系统API
        /// </summary>
        /// <param name="lpszCommand"></param>
        /// <param name="lpszReturnString"></param>
        /// <param name="cchReturn"></param>
        /// <param name="hwndCallback"></param>
        /// <returns></returns>
        [DllImport("winmm.dll", EntryPoint = "mciSendString", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern IntPtr mciSendString(String lpszCommand, String lpszReturnString, int cchReturn, int hwndCallback);

        [DllImport("winmm.dll", EntryPoint = "mciGetErrorString", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern bool mciGetErrorString(int fdwError, ref String lpszErrorText, int UINT);
        private String fileName;
        public void LoadFile(string filePath)
        {
            isPlaying = false;
            fileName = filePath;
        }

        public void Play()
        {
            mciSendString(String.Format("open {0} alias mysong", fileName), "", 0, 0);
            mciSendString("play mysong repeat", "", 0, 0);
            isPlaying = true;
        }

        public void Stop()
        {
            mciSendString("stop mysong", "", 0, 0);
            isPlaying = false;
        }

        public void Pause()
        {
            isPlaying = false;
            mciSendString("pause mysong", "", 0, 0);
        }

        public string GetErrMsg()
        {
            string s = string.Empty;
            mciGetErrorString(1, ref s, 0);
            return s;
        }
    }