求助：C#如何实现背景音乐循环播放（有部分代码）

Question

下面是播放音乐的类
 
using System;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;
using System.Collections.Generic;
namespace love
{
    ///    
    /// clsMci 的摘要说明。   
    ///    
    public class Class1
    {
        public Class1()
        {
            //   
            // TODO: 在此处添加构造函数逻辑   
            //   
        }        //定义API函数使用的字符串变量    
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
        private string Name = "";
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        private string durLength = "";
        [MarshalAs(UnmanagedType.LPTStr, SizeConst = 128)]
        private string TemStr = "";
        int ilong;
        //定义播放状态枚举变量   
        public enum State
        {
            mPlaying = 1,
            mPuase = 2,
            mStop = 3
        };
        //结构变量   
        public struct structMCI
        {
            public bool bMut;
            public int iDur;
            public int iPos;
            public int iVol;
            public int iBal;
            public string iName;
            public State state;
        };        public structMCI mc = new structMCI();        //取得播放文件属性   
        public string FileName
        {
            get
            {
                return mc.iName;
            }
            set
            {
                //ASCIIEncoding asc = new ASCIIEncoding();    
                try
                {
                    TemStr = "";
                    TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
                    Name = Name.PadLeft(260, Convert.ToChar(" "));
                    mc.iName = value;
                    ilong = APIClass.GetShortPathName(mc.iName, Name, Name.Length);
                    Name = GetCurrPath(Name);
                    //Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";   
                    Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
                    ilong = APIClass.mciSendString("close all", TemStr, TemStr.Length, 0);
                    ilong = APIClass.mciSendString(Name, TemStr, TemStr.Length, 0);
                    ilong = APIClass.mciSendString("set media time format milliseconds", TemStr, TemStr.Length, 0);
                    mc.state = State.mStop;
                }
                catch (Exception exp)
                {
                    // Log.Error(exp);
                    //MessageBox.Show("出错错误!");
                }
            }
        }
        //播放   
        public void play()
        {
            TemStr = "";
            TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
            APIClass.mciSendString("play media", TemStr, TemStr.Length, 0);
            mc.state = State.mPlaying;
        }
        //停止   
        public void StopT()
        {
            TemStr = "";
            TemStr = TemStr.PadLeft(128, Convert.ToChar(" "));
            ilong = APIClass.mciSendString("close media", TemStr, 128, 0);
            ilong = APIClass.mciSendString("close all", TemStr, 128, 0);
            mc.state = State.mStop;
        }        public void Puase()
        {
            TemStr = "";
            TemStr = TemStr.PadLeft(128, Convert.ToChar(" "));
            ilong = APIClass.mciSendString("pause media", TemStr, TemStr.Length, 0);
            mc.state = State.mPuase;
        }
        private string GetCurrPath(string name)
        {
            if (name.Length < 1)
                return "";
            name = name.Trim();
            name = name.Substring(0, name.Length - 1);
            return name;
        }
        //总时间   
        public int Duration
        {
            get
            {
                durLength = "";
                durLength = durLength.PadLeft(128, Convert.ToChar(" "));
                APIClass.mciSendString("status media length", durLength, durLength.Length, 0);
                durLength = durLength.Trim();
                if (durLength == "")
                    return 0;
                return (int)(Convert.ToDouble(durLength) / 1000f);
            }
        }        //当前时间   
        public int CurrentPosition
        {
            get
            {
                durLength = "";
                durLength = durLength.PadLeft(128, Convert.ToChar(" "));
                APIClass.mciSendString("status media position", durLength, durLength.Length, 0);
                mc.iPos = (int)(Convert.ToDouble(durLength) / 1000f);
                return mc.iPos;
            }
        }
    }    public class APIClass
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        public static extern int GetShortPathName(
         string lpszLongPath,
         string shortFile,
         int cchBuffer
        );        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
        public static extern int mciSendString(
         string lpstrCommand,
         string lpstrReturnString,
         int uReturnLength,
         int hwndCallback
        );
    }
}下面是窗体的代码：using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace love
{
    public partial class play : Form
    {
        
        Class1 mp3 = new Class1();
        public play()
        {
            InitializeComponent();
        }        private void play_Load(object sender, EventArgs e)
        {
            
            Play(Application.StartupPath + @"\mp3\11.mp3");            
           //  Form1 form1 = new Form1();
          //  form1.Show();
        }        public void Play(string file)
        {
                      
            mp3.FileName = file;
            mp3.play();
        }              
    }
}

问题是这样的，要实现音乐的背景播放，上面的代码没有问题，但是，现在要循环播放一首MP3，该如何做？
大家帮下忙，谢谢，只有10分了。不要嫌弃！谢谢

Answer 1

       public void play()
        {
            TemStr = "";
            TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
            APIClass.mciSendString("play media  repeat",TemStr, TemStr.Length, 0);
            mc.state = State.mPlaying;
        }

Answer 2

lfs09大哥，你是正确的，牛人，，谢谢！