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using System;class TestOverride{    public class Employee    {        public string name;        // Basepay is defined as protected, so that it may be         // accessed only by this class and derrived classes.        protected decimal basepay;        // Constructor to set the name and basepay values.        public Employee(string name, decimal basepay)        {            this.name = name;            this.basepay = basepay;        }        // Declared virtual so it can be overridden.        public virtual decimal CalculatePay()        {            return basepay;        }    }    // Derive a new class from Employee.    public class SalesEmployee : Employee    {        // New field that will affect the base pay.        private decimal salesbonus;        // The constructor calls the base-class version, and        // initializes the salesbonus field.        public SalesEmployee(string name, decimal basepay,                  decimal salesbonus)            : base(name, basepay)        {            this.salesbonus = salesbonus;        }        // Override是重寫，是在子類與父類中，子類中的方法的方法名，參數(shù)個數(shù)、類型都與父類中的完全一樣，在子類中覆蓋掉了父類的方法。        // Override the CalculatePay method         // to take bonus into account.        public override decimal CalculatePay()        {            return basepay + salesbonus;        }    }    static void Main()    {        // Create some new employees.        SalesEmployee employee1 = new SalesEmployee("Alice",                      1000, 500);        Employee employee2 = new Employee("Bob", 1200);        Console.WriteLine("Employee4 " + employee1.name +                  " earned: " + employee1.CalculatePay());        Console.WriteLine("Employee4 " + employee2.name +                  " earned: " + employee2.CalculatePay());    }}/*    Output:    Employee4 Alice earned: 1500    Employee4 Bob earned: 1200*/

using System;namespace Example07{    class Program    {        class BaseClass        {            public virtual void F()            {                Console.WriteLine("BaseClass.F");            }        }        class DeriveClass : BaseClass        {            public override void F()            {                base.F();                Console.WriteLine("DeriveClass.F");            }            // 重載是有相同的方法名，但參數(shù)類型或參數(shù)個數(shù)不同。            public void Add(int Left, int Right)            {                Console.WriteLine("Add for Int: {0}", Left + Right);            }            public void Add(double Left, double Right)            {                Console.WriteLine("Add for int: {0}", Left + Right);            }        }        static void Main(string[] args)        {            DeriveClass tmpObj = new DeriveClass();            tmpObj.F();            tmpObj.Add(1, 2);            tmpObj.Add(1.1, 2.2);        }    }}