职责链模式：使每个对象都机会处理请求，从而避免请求的发送者和接收者之间的耦合，将对象连成一条链，并沿着链传递请求。

 

1 namespace DesignModel.职责链模式 2 { 3     abstract class Handler 4     { 5         protected Handler next; 6         public void SetNext(Handler h) { 7             next = h; 8         } 9         public abstract void Exec(string type);10     }11 12     class ZhuZhang : Handler13     {14         15         public override void Exec(string type)16         {17             if (type == "讲需求")18             {19             }20             else21             {22                 next.Exec(type);23             }24         }25     }26     class JinLi : Handler27     {28         public override void Exec(string type)29         {30             if (type == "请假")31             {32             }33             else {
    //type==加薪34                 next.Exec(type);35             }36         }37     }38     class LaoBan : Handler39     {40         public override void Exec(string type)41         {42             if (type == "加薪")43             {44                 Console.WriteLine("不加");45             }46             else47             {48                 next.Exec(type);49             }50         }51     }52 53 }54 55  static void 职责链模式()56         {57 58             Handler zz = new ZhuZhang();59             Handler jl = new JinLi();60             Handler lb = new LaoBan();61 62             zz.SetNext(jl);63             jl.SetNext(lb);64 65             zz.Exec("加薪");66         }

链的结构由客户端来决定，链对象之间无耦合，意味你可以随时增加减少改变处理的链流程。