Singleton模式(Singleton创建类型)c#简单的例子

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";//对player1赋值
listBox1.Items.Add("------play1.jump,player1.move-------");
listBox1.Items.AddRange(new string[] { player1.jump, player1.move });

player player2 = player.GetPlayer;//未对player2赋值，但值与player1同样
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";//改动的player1。player2也被改动，说明是同一个类
listBox1.Items.Add("------play2.jump,player2.move-------");
listBox1.Items.AddRange(new string[] { player2.jump, player2.move });

listBox1.Items.Add(object.ReferenceEquals(player1, player2));//显示为true,说明两个为同一个类

}
}
class player
{
private player()//单例第一步，设构造函数为私有的。

{ }
private static player getplayer;
public static player GetPlayer//第二步获取单例
{
get
{
if (getplayer == null)//推断是否实例唯一
{
getplayer = new player();
}
return getplayer;
}

}
public string jump { get; set; }//单例中的属性
public string move { get; set; }
}
}

private static player getplayer;
public static player GetPlayer//第二步获取单例
{
get
{
if (getplayer == null)//推断是否实例唯一
{
getplayer = new player();
}
return getplayer;
}

}

public static readonly player GetPlayer = new player();//简化单例模式