浅谈.net中的职责链模式的使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CompTax
{
    public class CompTax
    {
        private double Taxp;
        private double Minincome;
        private static double Disc&＃61;2000;
        private CompTax NextCompTax;
        public CompTax(double Minincome, double Taxp)
        {
            this.Minincome &＃61; Minincome;
            this.Taxp &＃61; Taxp;
            NextCompTax &＃61; null;
        }
        public double Comp(double income)
        {

            if(income >&＃61; Minincome && (NextCompTax&＃61;&＃61;null|| income< NextCompTax.Minincome))
            {
                return (income - Disc) * Taxp;
            }
            else
            {
                return NextCompTax.Comp(income);
            }
        }

        public static CompTax GetInstance()
        {
            CompTax[] cp &＃61;{
                             new CompTax(0,0),
                             new CompTax(2000,0.05),
                             new CompTax(2500,0.1),
                             new CompTax(4000,0.15),
                             new CompTax(7000,0.2),
                             new CompTax(22000,0.25),
                             new CompTax(42000,0.3),
                             new CompTax(62000,0.35),
                             new CompTax(82000,0.4),
                             new CompTax(102000,0.45)
                         };
            CompTax ct&＃61;null;
            for (int i &＃61; 0; i < cp.Length-1; i&＃43;&＃43;)
            {
                if (i &＃61;&＃61; 0)
                    ct &＃61; cp[i];
                cp[i].NextCompTax &＃61; cp[i &＃43; 1];
            }
            return ct;
        }
    }
}