使用结构和arraylist获得帮助

Question

enter link description here我试图让（private int vr;）在循环中工作，所以我可以轻松地改变它，但是我不知道如何为此做一个get / set，或者如果我有完全使用get set。 我希望这是足够的信息，如果需要进一步的信息，请发表评论说。

    struct mp3players
    {

        private int ID;
        private string Make;
        private string Model;
        private int MBSize;
        private double Price;
        private int vr;

        public int id
        {
            get { return this.ID; }
            set { this.ID = value; }
        }

        public string make
        {
            get { return this.Make; }
            set { this.Make = value; }
        }

        public string model
        {
            get { return this.Model; }
            set { this.Model = value; }
        }

        public int mbsize
        {
            get { return this.MBSize; }
            set { this.MBSize = value; }
        }

        public double price
        {
            get { return this.Price; }
            set { this.Price = value; }
        }

        public int VR
        {
            get { return this.vr; }
            set { this.vr = value; }
        }
    } 

    private static ArrayList mps;
    static void mp3()
    {
        mp3players mp1 = new mp3players();
        mp1.id = 1;
        mp1.make = "GET technologies .inc";
        mp1.model = "HF 410 ";
        mp1.mbsize = 4096;
        mp1.price = 129.95;
        mp1.VR = 500;

        mp3players mp2 = new mp3players();
        mp2.id = 2;
        mp2.make = "Far & Loud";
        mp2.model = "XM 600 ";
        mp2.mbsize = 8192;
        mp2.price = 224.95;
        mp2.VR = 500;

        mp3players mp3 = new mp3players();
        mp3.id = 3;
        mp3.make = "Innotivative";
        mp3.model = "Z3 ";
        mp3.mbsize = 512;
        mp3.price = 79.95;
        mp3.VR = 500;

        mp3players mp4 = new mp3players();
        mp4.id = 4;
        mp4.make = "Resistance S.A.";
        mp4.model = "3001 ";
        mp4.mbsize = 4096;
        mp4.price = 124.95;
        mp4.VR = 500;

        mp3players mp5 = new mp3players();
        mp5.id = 5;
        mp5.make = "CBA";
        mp5.model = "NXT volume ";
        mp5.mbsize = 2048;
        mp5.price = 159.05;
        mp5.VR = 500;

        mps = new ArrayList();
        mps.Add(mp1);
        mps.Add(mp2);
        mps.Add(mp3);
        mps.Add(mp4);
        mps.Add(mp5);         
    }

    static void mutteer()
    {
        int i = 1;
        int a;

        startloop:
        while (i == 1)
        {
            Console.WriteLine("Wat is het Id van de mp3 speler?");
            try
            {
                a = Convert.ToInt16(Console.ReadLine());
            }
            catch
            {
                Console.WriteLine("Dat is geen nummer waarde!");
                goto startloop;
            }

            if (a == 1)
            {
                Console.WriteLine("Wat is het nieuwe voorraad");
                try
                {

你可以看到我在这里写的vr显然不起作用，  我需要使用这个集合并在我的理解中到达这里，但我如何得到一个get并设置使用它？

                    VR = Convert.ToInt32(Console.ReadLine());
                    i = 2;
                }
                catch
                {
                    Console.WriteLine("Dat is geen nummer waarde!");
                    goto startloop;
                }
            }
        }

    }