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        //文件路徑

        public static string path = AppDomain.CurrentDomain.BaseDirectory + @"..\..\sound\";

        #region 調(diào)用AP函數(shù)I播放音樂,要用到   mciSendString
        /// <summary>
        /// 播放MP3格式的音頻文件方法
        /// </summary>
        /// <param name="lpstrCommand"></param>
        /// <param name="lpstrReturnString"></param>
        /// <param name="uReturnLength"></param>
        /// <param name="hwndCallback"></param>
        /// <returns></returns>
        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
        public static extern int mciSendString(
        string lpstrCommand,//Pointer to a null-terminated string that specifies an MCI command string. For a list, see Multimedia Command Strings.
        string lpstrReturnString,//Pointer to a buffer that receives return information. If no return information is needed, this parameter can be NULL.
        int uReturnLength,//Size, in characters, of the return buffer specified by the lpszReturnString parameter.
        int hwndCallback);//Handle to a callback window if the "notify" flag was specified in the command string.
       
        /// <summary>
        /// 播放MID格式音頻的方法
        /// </summary>
        /// <param name="lpstrCommand"></param>
        /// <param name="lpstrReturnString"></param>
        /// <param name="uReturnLength"></param>
        /// <param name="hwndCallback"></param>
        /// <returns></returns>
        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
        public static extern long mciExecute(
        string lpstrCommand,//Pointer to a null-terminated string that specifies an MCI command string. For a list, see Multimedia Command Strings.
        string lpstrReturnString,//Pointer to a buffer that receives return information. If no return information is needed, this parameter can be NULL.
        int uReturnLength,//Size, in characters, of the return buffer specified by the lpszReturnString parameter.
        int hwndCallback);//Handle to a callback window if the "notify" flag was specified in the command string.
        #endregion

        #region mp3和mid文件的播放方法
        /// <summary>
        /// 背景音樂播放方法
        /// </summary>
        /// <param name="path"></param>
        private void playMID(string path)
        {
            mciExecute("Open " + path + " alias mid", null, 0, 0);
            mciExecute("Play mid", null, 0, 0);
        }

        /// <summary>
        /// 背景音樂停止方法
        /// </summary>
        private void pauseMID()
        {
            mciExecute("Close mid", null, 0, 0);
        }

        public void playWAV(string path)
        {
            mciSendString("Open " + path + " alias wavType", null, 0, 0);
            mciSendString("Play wavType", null, 0, 0);
        }

        public void pauseWAV()
        {
            mciSendString("Close wavType", null, 0, 0);
        }
        #endregion

       //在窗體加載事件里調(diào)用上面的兩個(gè)方法來播放mp3和mid

         private void Form1_Load(object sender, EventArgs e)
        {

            this.playMID(path + "back2.mid");

            this.playWAV(path + "back.mp3");//此方法也可以播放WAV格式音頻文件

        }