责任链设计模式，是行为型设计模式的巅峰之作。
现在有一个场景，请假申请。请假时间的长短，需要不同级别的领导才能审批。
万物皆对象嘛，请假需要工号、姓名、原因、时长、结果等等，那我们来定义一个请假的类。其实其就是一个上下文环境（context），保存业务处理中参数-----中间结果-----最终结果。行为型设计模式重用的标配，把行为转移。
我要评论public class applycontext
{
public int id { get; set; }
public string name { get; set; }
/// <summary>
/// 请假时长
/// </summary>
public int hour { get; set; }
public string description { get; set; }
public bool auditresult { get; set; }
public string auditremark { get; set; }
}
请假需要new一个实例：
applycontext context = new applycontext()
{
id = 506,
name = "bingle",
hour = 100,
description = "世界那么大，我想去看看！",
auditresult = false,
auditremark = ""
};
第一种方式，审批逻辑都卸载上端，直接就是需求翻译，没有任何加工，谈不上什么扩展，面向国产：
if (context.hour <= 8)
{
console.writeline("pm审批通过");
}
else if (context.hour <= 16)
{
console.writeline("主管审批通过");
}
else
{
console.writeline("************");
}
第二种方式，面向对象：封装--继承--多态，转移业务逻辑，也只是一个翻译机，翻译完+面向对象，其实完全没有涉及加工没有思考。
领导类s：
public class pm
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 8)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
}
}
public class charge
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 16)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
}
}
public class manager
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 24)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
}
}
public class chief
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 48)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
}
}
public class ceo : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 96)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
}
}
public class chiarman : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 1000000)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
}
}
下面进行逻辑的翻译：
abstractauditor pm = new pm()
{
name = "bingle1"
};
pm.audit(context);
if (!context.auditresult)
{
abstractauditor charge = new charge()
{
name = "bingle2"
};
charge.audit(context);
if (!context.auditresult)
{
abstractauditor manager = new manager()
{
name = "bingle3"
};
manager.audit(context);
if (!context.auditresult)
{
//找下一环节
}
}
}
不要直接翻译的逻辑，需要涉及，现在的场景分析是，1、权限范围内，审批通过；2、权限范围外，交给下一环节审批，写的代码又多了一个，指定洗衣环节，甩锅大法开始。
首先定义一个抽象父类：
public abstract class abstractauditor
{
public string name { get; set; }
public abstract void audit(applycontext context);
private abstractauditor _nextauditor = null;
public void setnext(abstractauditor auditor)
{
this._nextauditor = auditor;
}
protected void auditnext(applycontext context)
{
if (this._nextauditor != null)
{
this._nextauditor.audit(context);
}
else
{
context.auditresult = false;
context.auditremark = "不允许请假！";
}
}
}
领导类需要继承这个抽象类：
public class pm : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 8)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
abstractauditor charge = new charge()
{
name = "象扑君"
};
charge.audit(context);
}
}
}
其他的领导类以此类推.....
调用的时候，只需要找最低权限的人，去审批
abstractauditor pm = new pm()
{
name = "bingle"
};
pm.audit(context);
以上，转移了申请提交的逻辑，这次符合实际情况，有了自己的思考和设计在里面。
甩锅大法开始了，一样，领导类需要实现抽象父类，不过在audit方法中稍作了改动
public class pm : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 8)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
base.auditnext(context);
}
}
}
public class manager : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 24)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
base.auditnext(context);
}
}
}
public class chief : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 48)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
base.auditnext(context);
}
}
}
public class chiarman : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 1000000)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
base.auditnext(context);
}
}
}
public class charge: abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 16)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
base.auditnext(context);
}
}
}
public class ceo : abstractauditor
{
public override void audit(applycontext context)
{
console.writeline($"this is {this.gettype().name} {this.name} audit");
if (context.hour <= 96)
{
context.auditresult = true;
context.auditremark = "允许请假！";
}
else
{
base.auditnext(context);
}
}
}
下面需要找领导审批了：
abstractauditor pm = new pm()
{
name = "bingle1"
};
abstractauditor charge = new charge()
{
name = "bingle1"
};
abstractauditor manager = new manager()
{
name = "bingle1"
};
abstractauditor chief = new chief()
{
name = "bingle1"
};
abstractauditor ceo = new ceo()
{
name = "bingle1"
};
//pm.setnext(charge);
//charge.setnext(manager);
pm.setnext(manager);
manager.setnext(chief);
chief.setnext(ceo);
ceo.setnext(new chiarman()
{
name = "bingle1"
});
//流程的可扩展
pm.audit(context);
if (!context.auditresult)
{
console.writeline("不干了！");
}
以上，把流畅环节逻辑从业务类转移了。
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