override和overload的区别

1、override

class Program
    {
        public class Employee
        {
            public string name;
            protected decimal basepay;
            public Employee(string name, decimal basepay)
            {
                this.name = name;
                this.basepay = basepay;
            }
            public virtual decimal CalculatePay()
            {
                return basepay;
            }
        }
        public class SalesEmployee : Employee
        {
            private decimal salesbonus;
            public SalesEmployee(string name, decimal basepay, decimal salesbonus):base(name,basepay)//与基类通讯，调用基类的构造函数
            {
                this.salesbonus = salesbonus;
            }
            public override decimal CalculatePay()
            {
                return basepay + salesbonus;
            }
        }
        static void Main(string[] args)
        {Employee employee2 = new Employee("Bob", 1200);
            SalesEmployee employee1 = new SalesEmployee("Alice",1000, 500);
            
            Console.WriteLine("Employee " + employee1.name +" earned: " + employee1.CalculatePay());
            Console.WriteLine("Employee " + employee2.name +" earned: " + employee2.CalculatePay());
        }
    }

运行结果.
Employee Alice earned: 1500
Employee Bob earned: 1200

2、overload

class Class_B
{
       public void a()
       {
           Console.WriteLine("no parameters function");
       }
       public void a(int i, int j)
       {
           Console.WriteLine("{0}+{1}={2}", i, j, i + j);
       }
}
public class test
{
       public static void Main(string[] args)
       {
           Class_B b = new Class_B();
           b.a();
           b.a(2, 6);
       }
}

运行结果.
no parameters function
2+6=8