using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication3{    /// 
    /// 策略模式是针对一组算法，将每个算法封装到具有公共接口的独立的类中，    /// 从而使它们可以相互替换。策略模式使得算法可以在不影响到客户端的情况下发生变化。    /// 
    class Program    {        static void Main(string[] args)        {            // 个人所得税方式            InterestOperation operation = new InterestOperation(new PersonalTaxStrategy());            Console.WriteLine("个人支付的税为：{0}", operation.GetTax(5000.00));            // 企业所得税            operation = new InterestOperation(new EnterpriseTaxStrategy());            Console.WriteLine("企业支付的税为：{0}", operation.GetTax(50000.00));            Console.Read();        }    }    // 所得税计算策略    public interface ITaxStragety    {        double CalculateTax(double income);    }    // 个人所得税    public class PersonalTaxStrategy : ITaxStragety    {        public double CalculateTax(double income)        {            return income * 0.12;        }    }    // 企业所得税    public class EnterpriseTaxStrategy : ITaxStragety    {        public double CalculateTax(double income)        {            return (income - 3500) > 0 ? (income - 3500) * 0.045 : 0.0;        }    }    /// 
    /// 选择方法    /// 
    public class InterestOperation    {        private ITaxStragety m_strategy;        public InterestOperation(ITaxStragety strategy)        {            this.m_strategy = strategy;        }        public double GetTax(double income)        {            return m_strategy.CalculateTax(income);        }    }}