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）