设计模式--职责链模式

使多个对象都有机会处理请求，从而避免请求的发送者和接收者之间的耦合关系。将这个对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理它为止。

使得接收者和发送者都没有对方的明确信息，且链中的对象自己也并不知道链的结构。结果是职责链可简化对象的相互连接，它们仅需保持一个指向其后继者的引用，而不需保持它所有的候选接收者的引用。这也大大降低了耦合度。

由于是在客户端来定义链的结构，也就是可以随时地增加或修改处理一个请求的结构。增强了给对象指派职责的灵活性。

//申请
class Request
{
//申请类别
public string RequestType { get; set; }
//申请内容
public string RequestContent { get; set; }
//数量
public int Number { get; set; }
}

//定义管理者抽象类

abstract class Manager
{
protected string name;
//管理者的上级
protected Manager supperior;

public Manager(string name)
{
this.name = name;
}
//设置管理者的上级
public void SetSuperlior(Manager manager)
{
this.supperior = manager;
}
//申请请求
public abstract void RequestApplications(Request request);

}

//实现管理者类

//经理
class CommonManager : Manager
{
public CommonManager(string name) : base(name)
{
}

public override void RequestApplications(Request request)
{
if(request.RequestType.Equals("请假")&&request.Number<=2)
{
Console.WriteLine("{0}:{1} 数量：{2}被批准", name, request.RequestContent, request.Number);
}
else
{
if(supperior!=null)
{
supperior.RequestApplications(request);
}
}

}
}

//总监
class Majordomo : Manager
{
public Majordomo(string name) : base(name)
{
}

public override void RequestApplications(Request request)
{
if(request.RequestType.Equals("请假")&&request.Number<=5)
{
Console.WriteLine("{0}：{1} 数量：{2}被批准", name, request.RequestContent, request.Number);
}
else
{
if(supperior!=null)
{
supperior.RequestApplications(request);
}
}
}
}

//总经理
class GeneralManager : Manager
{
public GeneralManager(string name) : base(name)
{
}

public override void RequestApplications(Request request)
{
if(request.RequestType.Equals("请假"))
{
Console.WriteLine("{0}：{1} 数量{2}被批准", name, request.RequestContent, request.Number);
}
else if(request.RequestType.Equals("加薪")&&request.Number<=5000)
{
Console.WriteLine("{0}：{1} 数量{2}被批准", name, request.RequestContent, request.Number);
}
else if(request.RequestType.Equals("加薪")&&request.Number>5000)
{
Console.WriteLine("{0}：{1} 数量{2}再说吧", name, request.RequestContent, request.Number);
}
}
}

调用：

CommonManager jinli = new CommonManager("jinli");
Majordomo zongjian = new Majordomo("zongjian");
GeneralManager zhongjingli= new GeneralManager("zongjingli");

//上级可以任意设置

jinli.SetSuperlior(zongjian);
zongjian.SetSuperlior(zhongjingli);

Request req = new Request()
{
RequestType = "请假",
RequestContent = "小菜请假",
Number = 1
};
jinli.RequestApplications(req);

req = new Request()
{
RequestType = "请假",
RequestContent = "小菜请假",
Number =10
};
jinli.RequestApplications(req);

req = new Request()
{
RequestType = "请假",
RequestContent = "小菜请假",
Number = 3
};
jinli.RequestApplications(req);

req = new Request()
{
RequestType = "加薪",
RequestContent = "小菜请求加薪",
Number = 5000
};
jinli.RequestApplications(req);

req = new Request()
{
RequestType = "加薪",
RequestContent = "小菜请求加薪",
Number = 10000
};
jinli.RequestApplications(req);