写出程序运行的结果 Public class Base Public virtual string Hello（) {return “Base”;} Pu-学而优知识库

写出程序运行的结果 Public class Base Public virtual string Hello（) {return “Base”;} Pu

写出程序运行的结果
Public class Base
Public virtual string Hello() {return “Base”;}
Public class Sub:Base
Public override string Hello() {return “Sub”;}
1. Base b = new Base(); b.Hello;
2. Sub s = new Sub(); s.Hello;
3. Base b = new Sub (); b.Hello;
4. Sub s = new Base(); s.Hello;

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