当子类拥有和父类相同的方法时，使用new关键字和override关键字的区别

在非多态状态下才会调用被new修饰的和父类相同的方法。

如：

 public class Person1 : ReaderBusiness
    {
        public override IReaderDTO ReadMessage(string message)
        {
            return new model1() { MyProperty = 111 };
        }
        public override string GetSyncType()
        {
            return "person1";
        }
        public override IList<IReaderDTO> ReadMessages(string message)
        {
            throw new NotImplementedException();
        }
    }

public class Person_son:Person1
    {
       new public IReaderDTO ReadMessage(string message)
        {
            return new model1() { MyProperty=2333};
        }
    }

Person_son p = new Person_son();
IReaderDTO m1= p.ReadMessage("");
model1 mm1 = m1 as model1;
Console.WriteLine(mm1.MyProperty);
Console.ReadLine();

控制台输出2333

ReaderInterface rI = new Person_son();
IReaderDTO m= rI.ReadMessage("1");
model1 mm = m as model1;
Console.WriteLine(mm.MyProperty);

控制台输出111

override会重写父类的方法，任何时候都是调用子类的。