C# 之 System.Object

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            MyBaseClass myBase=new MyBaseClass();
            MyDerivedClass myDerived=new MyDerivedClass ();
            object o=myDerived ;
            MyBaseClass b=myDerived;
            Console.WriteLine("mybase:Type is {0}",myBase.GetType ());
            Console.WriteLine("myDerived:Type is {0}",myDerived .GetType ());
            Console.WriteLine("object o=myDerived:Type is {0}",o.GetType ());
            Console.WriteLine("MyCassClass b=myDerived:Type is {0}",b.GetType ());
        }
    }
    public class MyBaseClass:object 
    {


    }
    public class MyDerivedClass:MyBaseClass 
    {


    }

class Program
    {
        static void Main(string[] args)
        {
            object o = null;
            object p = null;
            object q = new object();
            Console.WriteLine(object.ReferenceEquals(o, p));
            p = q;
            Console.WriteLine(object.ReferenceEquals(p, q));
            Console.WriteLine(object.ReferenceEquals(o, p));
         }
    }

class MyDerivedClass:MyBaseClass 
    {
        static void Main(string[] args)
        {
            MyDerivedClass m1 = new MyDerivedClass();
            m1.age=42;
            m1.name="Sam";
            MyDerivedClass m2 = (MyDerivedClass)m1.MemberwiseClone();
            
            Console.WriteLine(m2.name);
            Console.WriteLine(m2.age);
        }
    }


    class MyBaseClass
    {
        public string name;
        public int age;
    }