单实例

static void Main(string[] args)
{           
    for (int i = 0; i <= 100; i++)
    {
        Thread t = new Thread(new ParameterizedThreadStart(doSome));
        t.Start(null);               
    }
    Console.ReadLine();
}

private static void doSome(object obj)
{           
    MyReadOnly obj1 = MyReadOnly.getInstance;
    Console.WriteLine(obj1.GetHashCode().ToString());
}   

class MyReadOnly
{
    private static  MyReadOnly instance  = new MyReadOnly();
    int counter = 0;

   // static MyReadOnly()
   // {
   // }  treat is as commented code.

    public static MyReadOnly getInstance { get { return instance; } }
    private MyReadOnly()
    {
        Console.WriteLine((++counter).ToString());
    }       
}

当我看到这个程序的输出时,我看到只创建了一个对象(因为相同的hashcode)

编辑

删除导致一些混乱的静态构造函数