static void Main(string[] args)
{
Singleton1 s1 = Singleton1.GetInstance();
s1.Name = "张三";
Singleton2 s2 = Singleton2.GetInStance();
s2.Name = "王五";
Console.WriteLine(s1.Name);
Console.WriteLine(s2.Name);
Console.ReadKey();
}
public static Singleton1 getInstance()
{
//双重if+lock，第一个if是为了避免每次都加锁，提升效率
//第二个if是为了多线程安全
if (instance == null)
{
lock (obj)
{
if (instance == null)
{
instance = new Singleton1();
}
}
}
return(instance);
}
private void button1_Click(object sender, EventArgs e)
{
Singleton1 single1 = Singleton1.getInstance();
}
