一个责任链模式的例子

/**//*****************************************************
* 一个责任链模式例子
*该例子是三类售货员处理订单的情况
*如果订单金额小于1000,则一级售货员可以处理该订单
*如果订单金额小于10000,则二级售货员可以处理该订单
*如果订单金额小于100000,则三级售货员可以处理该订单
******************************************************/

using System;

/**//// <summary>
///售货员接口,所有类型的售货员必须实现该接口
/// </summary>
interface ISalesMan
{
    string Name {set;get;} //售货员名字
    void SetNext(ISalesMan nextSalesMan); //设置下一级售货员
    void Process(Order order); //处理订单
}

/**//// <summary>
/// 订单类
/// </summary>
class Order
{
    private int orderAmount;

    public int Amount
    {
        set{ this.orderAmount = value;}
        get{ return this.orderAmount; }
    }
}

/**//// <summary>
/// 一类售货员
/// </summary>
class FirstSalesMan : ISalesMan
{
    private ISalesMan nextSalesMan = null;
    private string name = string.Empty;

    ISalesMan 成员#region ISalesMan 成员

    public string Name
    {
        get
        {
            // TODO:  添加 FirstSalesMan.Name getter 实现
            return this.name;
        }
        set
        {
            this.name = value;
        }
    }

    public void SetNext(ISalesMan nextSalesMan)
    {
        this.nextSalesMan = nextSalesMan;
    }

    public void Process(Order order)
    {
        if(order.Amount < 1000)
            Console.WriteLine("{0} Process the order,the mount of this order is: {1}",this.name,order.Amount);
        else if(this.nextSalesMan != null)
            nextSalesMan.Process(order);
    }

    #endregion
}

/**//// <summary>
/// 二类售货员
/// </summary>
class SecondSalesMan : ISalesMan
{
    private ISalesMan nextSalesMan = null;
    private string name = string.Empty;

    ISalesMan 成员#region ISalesMan 成员

    public string Name
    {
        get
        {
            // TODO:  添加 FirstSalesMan.Name getter 实现
            return this.name;
        }
        set
        {
            this.name = value;
        }
    }

    public void SetNext(ISalesMan nextSalesMan)
    {
        this.nextSalesMan = nextSalesMan;
    }

    public void Process(Order order)
    {
        if(order.Amount < 10000)
            Console.WriteLine("{0} Process the order,the mount of this order is: {1}",this.name,order.Amount);
        else if(this.nextSalesMan != null)
            nextSalesMan.Process(order);
    }

    #endregion
}

/**//// <summary>
/// 三类售货员
/// </summary>
class ThirdSalesMan : ISalesMan
{
    private ISalesMan nextSalesMan = null;
    private string name = string.Empty;

    ISalesMan 成员#region ISalesMan 成员

    public string Name
    {
        get
        {
            // TODO:  添加 FirstSalesMan.Name getter 实现
            return this.name;
        }
        set
        {
            this.name = value;
        }
    }

    public void SetNext(ISalesMan nextSalesMan)
    {
        this.nextSalesMan = nextSalesMan;
    }

    public void Process(Order order)
    {
        if(order.Amount < 100000)
            Console.WriteLine("{0} Process the order,the mount of this order is: {1}",this.name,order.Amount);
        else if(this.nextSalesMan != null)
            nextSalesMan.Process(order);
    }

    #endregion
}

class Client
{
    public static void Main(string[] args)
    {
        FirstSalesMan first = new FirstSalesMan();
        first.Name = "firstMan";

        SecondSalesMan second = new SecondSalesMan();
        second.Name = "secondMan";

        ThirdSalesMan third = new ThirdSalesMan();
        third.Name = "thirdMan";

        first.SetNext(second);
        second.SetNext(third);

        Order o = new Order();
        o.Amount = 300;
        first.Process(o);

        o = new Order();
        o.Amount = 1300;
        first.Process(o);

        o = new Order();
        o.Amount = 11300;
        first.Process(o);

        Console.Read();
    }
}