單件模式(Singleton建立型)c#簡單例子

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單件(Singleton建立型模式)c#簡單例子

需要產生一個執行個體時，可採用單件模式

例子中只可產生一個玩家，並對玩家進行測試。單線程例子如下：

namespace singletonpattern{    public partial class SingletonForm : Form    {        public SingletonForm()        {            InitializeComponent();        }        private void btnDisplay_Click(object sender, EventArgs e)        {            player player1 = player.GetPlayer;            player1.jump = "跳一跳";            player1.move = "走一走";//對player1賦值            listBox1.Items.Add("------play1.jump,player1.move-------");            listBox1.Items.AddRange(new string[] { player1.jump, player1.move });            player player2 = player.GetPlayer;//未對player2賦值，但值與player1相同            listBox1.Items.Add("------play2.jump,player2.move-------");            listBox1.Items.AddRange(new string[] { player2.jump, player2.move });            player1.jump = "跳一跳,跑一跑";            player1.move = "走一走，看--看";//修改的player1，player2也被修改，說明是同一個類            listBox1.Items.Add("------play2.jump,player2.move-------");            listBox1.Items.AddRange(new string[] { player2.jump, player2.move });            listBox1.Items.Add(object.ReferenceEquals(player1, player2));//顯示為true,說明兩個為同一個類        }    }    class player    {        private player()//單例第一步，設建構函式為私人的。        { }        private static player getplayer;        public static player GetPlayer//第二步擷取單例        {            get            {                if (getplayer == null)//判斷是否執行個體唯一                {                    getplayer = new player();                }                return getplayer;            }        }         public string jump { get; set; }//單例中的屬性        public string move { get; set; }    }}

其中

 private static player getplayer;        public static player GetPlayer//第二步擷取單例        {            get            {                if (getplayer == null)//判斷是否執行個體唯一                {                    getplayer = new player();                }                return getplayer;            }        }

可簡化為一句

       public static readonly player GetPlayer = new player();//簡化單例模式

單件模式(Singleton建立型)c#簡單例子