C#设计模式之二十职责链模式（Chain of Responsibility Pattern

  1 namespace ChainOfResponsibility
  2 {
  3     // 采购请求
  4     public sealed class PurchaseRequest
  5     {
  6          金额
  7         double Amount { get; set; }
  8 
  9          产品名字
 10         string ProductName {  11 
 12         public PurchaseRequest(double amount,string productName)
 13         {
 14             Amount = amount;
 15             ProductName = productName;
 16         }
 17     }
 18  
 19     抽象审批人,Handler---相当于“抽象处理者角色”
 20     abstract  Approver
 21  22         下一位审批人，由此形成一条链
 23         public Approver NextApprover {  24 
 25         审批人的名称
 26         string Name {  27 
 28         public Approver( name)
 29  30             this.Name = name;
 31  32 
 33         处理请求
 34         void ProcessRequest(PurchaseRequest request);
 35  36  
 37     部门经理----相当于“具体处理者角色” ConcreteHandler
 38      Manager : Approver
 39  40         public Manager(string name): base(name){ }
 41  
 42         override  ProcessRequest(PurchaseRequest request)
 43  44             if (request.Amount <= 10000.0)
 45             {
 46                 Console.WriteLine("{0} 部门经理批准了对原材料{1}的采购计划！",1)">this.Name,request.ProductName);
 47             }
 48             else if (NextApprover != null 49  50                 NextApprover.ProcessRequest(request);
 51  52  53  54  
 55     财务经理---相当于“具体处理者角色”ConcreteHandler
 56      FinancialManager : Approver
 57  58         public FinancialManager( 59 
 60          61  62             if (request.Amount > 10000.0 && request.Amount <= 50000.0 63  64                 Console.WriteLine({0} 财务经理批准了对原材料{1}的采购计划！ 65  66              67  68  69  70  71  72  
 73     总裁---相当于“具体处理者角色” ConcreteHandler
 74      CEO :Approver
 75  76         public CEO( 77 
 78          79  80             50000.0 && request.Amount < 300000.0 81  82                 Console.WriteLine({0} 总裁批准了对原材料 {1} 的采购计划！ 83  84             else
 85  86                 Console.WriteLine(这个采购计划的金额比较大，需要一次董事会会议讨论才能决定！");
 87  88  89  90  
 91      Program
 92  93         static void Main([] args)
 94  95             PurchaseRequest requestDao = new PurchaseRequest(8000.0,单刀5把 96             PurchaseRequest requestHuaJi = 10000.0,1)">10把方天画戟 97             PurchaseRequest requestJian = 80000.0,1)">5把金丝龙鳞闪电劈 98  
 99             Approver manager = new Manager(黄飞鸿100             Approver financial = new FinancialManager(黄麒英101             Approver ceo = new CEO(十三姨102  
103              设置职责链
104             manager.NextApprover = financial;
105             financial.NextApprover = ceo;
106  
107              处理请求
108             manager.ProcessRequest(requestDao);
109             manager.ProcessRequest(requestHuaJi);
110             manager.ProcessRequest(requestJian);
111 
112             Console.ReadLine();
113 114 115 }