行為型設計模式---模板方法觀察者模式責任鏈模式

1.模板方法：其實就是抽象出來一層出來

2.觀察者模式：事件的方式

3.責任鏈模式：

請假審批：

                AbstractAuditor auditor = AuditorBuilder.Build();
                auditor.Audit(context);

可以指定是哪一級，使用SetNext指定下一流程是哪個。

public class AuditorBuilder
    {
        public static AbstractAuditor Build()
        {
            //更具備擴充套件性
            AbstractAuditor pm1 = new PM();
            AbstractAuditor charge = new Charge();
            AbstractAuditor manager = new Manager();
            pm1.SetNext(charge);
            charge.SetNext(manager);


            //反射+配置檔案

            return pm1;
        }
    }

抽象類如下：裡面包含方法如下：

public abstract class AbstractAuditor
    {
        
        public string Name { get; set; }

        public abstract void Audit(ApplyContext context);

        private AbstractAuditor _Auditor = null;
        public void SetNext(AbstractAuditor auditor)
        {
            this._Auditor = auditor;
        }

        public void AuditNext(ApplyContext context)
        {
            if (_Auditor != null)
            {
                _Auditor.Audit(context);
            }
        }
    }

PM例項：

class PM :AbstractAuditor
    {
        public override void Audit(ApplyContext context)
        {
            Console.WriteLine("這裡是專案經理審批");
            if (context.Hour <= 8)
            {
                context.AuditResult = true;
                context.AnditRemark = "enjoy your vacation";
            }
            else
            {
                //Console.WriteLine("這裡是主管審批");
                //AbstractAuditor abstractAuditor = new Charge();
                //abstractAuditor.Audit(context);
                //if(_Auditor != null)
                //{
                //    _Auditor.Audit(context);
                //}
                base.AuditNext(context);
            }
        }
    }

Charge例項：

class Charge : AbstractAuditor
    {
        public override void Audit(ApplyContext context)
        {
            Console.WriteLine("這裡是主管審批");
            if (context.Hour <= 16)
            {
                context.AuditResult = true;
                context.AnditRemark = "enjoy your vacation";
            }
            else
            {
                base.AuditNext(context);
            }
        }
    }