摘要：
usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceConsoleApplication3{classProgram{staticvoidMain(string[]args){Aa=newA();Console.WriteLine(a.ToString());Console.WriteLine(a.ToString2());a=newB();Console.WriteLine(a.ToString());Console.WriteLine(a.ToString2());Co 阅读全文
