C# 设计模式（10）装饰器模式

装饰器模式

1.继承+组合

2. AOP编程思想的一种实现

代码实现：

员工：

namespace DecoratorPattern
{
    public abstract class AbstractEmployee
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public abstract void Work();
    }
    public class Employee : AbstractEmployee
    {
        public override void Work()
        {
            Console.WriteLine($"{this.GetType().Name} 上班八小时.");
        }
    }
}

装饰器：

namespace DecoratorPattern.Decorator
{
    public class BaseEmployeeDecorator:AbstractEmployee
    {
        private readonly AbstractEmployee _employee;

        public BaseEmployeeDecorator(AbstractEmployee employee)
        {
            _employee = employee;
        }
        public override void Work()
        {
            _employee.Work();
        }
    }
    public class EmployeeSoftwareDecorator:BaseEmployeeDecorator
    {
        private readonly AbstractEmployee _employee;

        public EmployeeSoftwareDecorator(AbstractEmployee employee) : base(employee)
        {
            _employee = employee;
        }

        public override void Work()
        {
            _employee.Work();
            Console.WriteLine($"{this.GetType().Name} 留下来加个班.");
        }
    }
}

代码调用：

    class Program
    {
        static void Main(string[] args)
        {
           AbstractEmployee  employee = new Employee() { Id = 101, Name = "Alex" };
           employee = new EmployeeSoftwareDecorator(employee);
           employee.Work();
        }
    }

结果：