C#WinForm中播放背景音乐（亲测可用）

using System.Runtime.InteropServices;

        public static uint SND_ASYNC = 0x0001;
        public static uint SND_FILENAME = 0x00020000;
        [DllImport("winmm.dll")]
        public static extern uint mciSendString(string lpstrCommand,
        string lpstrReturnString, uint uReturnLength, uint hWndCallback);

        //播放背景音乐
        public void Play()
        {
            mciSendString(@"close temp_alias", null, 0, 0);
            mciSendString(@"open ""G:/Club_Card/此情可待.mp3"" alias temp_alias", null, 0, 0);
            mciSendString("play temp_alias repeat", null, 0, 0);
        }

        //关闭背景音乐
        mciSendString(@"close temp_alias", null, 0, 0);
        mciSendString(@"close ""G:/Club_Card/此情可待.mp3"" alias temp_alias", null, 0, 0);
        mciSendString("pause temp_alias repeat", null, 0, 0);