C#三大支柱之继承

1、使用base

若子类需要使用父类公开或受保护的成员则需要是base

 class Manager : Employee
     {
         public int StockOptions { get; set; }

         public Manager(string fullName, int age, int empID,
           float currPay, string ssn, int numbOfOpts)
             : base(fullName, age, empID, currPay, ssn)
         {
             // This field is defined by the Manager class.
             StockOptions = numbOfOpts;
         }
         // Add back the default ctor
         public Manager() {}
     }

2、使用sealed 保证类不会被继承（密封类）