namespace PartternCase
{public abstract class AbstractWatch{//Component in UMLpublic abstract void StartWork();}public class Watch : AbstractWatch{//ConcreteComponent in UMLpublic override void StartWork(){//Show Beijing time
        }}public abstract class WatchDecorator : AbstractWatch{//Decorator in UMLprotected AbstractWatch Watch { get; set; }protected WatchDecorator(AbstractWatch watch){Watch = watch;}}public class ShowDateDecorator : WatchDecorator{//ConcreteDecoratorA in UMLpublic ShowDateDecorator(AbstractWatch watch): base(watch){}public override void StartWork(){Watch.StartWork();//Show date of current time zone
        }}public class ShowSecTimeZoneDecorator : WatchDecorator{//ConcreteDecoratorB in UMLpublic ShowSecTimeZoneDecorator(AbstractWatch watch): base(watch){}public override void StartWork(){Watch.StartWork();// Show time of sencond timezone
        }}public class Client{//How to use decorator patternpublic void ChooseWatch(){var watch = new Watch();//Basic functionvar middleWatch = new ShowDateDecorator(watch);//Middle: contain show date functionvar advanceWatch = new ShowSecTimeZoneDecorator(middleWatch);//Advance: contain show date and second time zone function
        }}
}

namespace PartternCase
{public abstract class Report{//Subject in UMLpublic string Status { get; set; }protected IList<Employee> Employees { get; set; }public void Attach(Employee employee){Employees = Employees ?? new List<Employee>();Employees.Add(employee);}public void Detach(Employee employee){if (Employees == null) { return; }Employees.Remove(employee);}public void Notify(Report report){if (Employees == null) { return; }foreach (var employee in Employees){employee.HandleReportSubmit(report);}}}public class ExpenseReport : Report{//ConcreteSubject in UMLpublic void Submit(){Status = "Report Submited";Notify(this);}}public abstract class Employee{//Observer in UMLpublic abstract void HandleReportSubmit(Report report);}public class Boss : Employee{//ConcreteObserver in UMLpublic string Status { get; set; }public override void HandleReportSubmit(Report report){// Send email to this boss by smtp serverStatus = report.Status;}}public class Client{//How to use observer patternpublic void Observer(){var boss1 = new Boss();var boss2 = new Boss();var expense = new ExpenseReport();expense.Attach(boss1);expense.Attach(boss2);expense.Submit();}}
}

namespace PartternCase
{public abstract class DrinkOperation{//AbstractClass in UMLpublic void Perform(){//Interface for client call
            Product();Sales();}protected abstract void Product();protected abstract void Sales();}public class MilkOperation : DrinkOperation{//ConcreteClass in UMLprotected override void Product(){//Get raw material from milk station then process
        }protected override void Sales(){//Sell by deliveryman
        }}public class WaterOperation : DrinkOperation{//ConcreteClass in UMLprotected override void Product(){//Get raw material from mountain then process
        }protected override void Sales(){//Sell by supermarket
        }}
}

namespace PartternCase
{public class CalculationEngine{//Singleton in UMLprotected CalculationEngine() { }private static readonly CalculationEngine instance = new CalculationEngine();public static CalculationEngine GetInstance { get { return instance; } }// Interface for client call//Many calculation methods
    }
}

namespace PartternCase
{public abstract class CapitalCall{//Creator in UMLpublic abstract Partner BuildPartner();public void Perform(){var partner = BuildPartner();//Calculate amount of partner then save partner
        }}public class GpCapitalCall : CapitalCall{//ConcreteCreator in UMLpublic override Partner BuildPartner(){return new GP();}}public class Partner{//Product in UMLpublic decimal Amount { get; set; }}public class GP : Partner{//ConcreteProduct in UML
    }
}

namespace PartternCase
{public abstract class DrinkCriteria{//Prototype in UMLpublic abstract string QueryTable { get; }public DateTime StartDate { get; set; }public DateTime EndDate { get; set; }//Other query fieldspublic abstract DrinkCriteria Clone();}public class MilkCriteria : DrinkCriteria{//Concrete Prototype1 in UMLpublic override string QueryTable { get { return "Milk"; } }public override DrinkCriteria Clone(){//This is shallow copy, in other case maybe need deep copy.return MemberwiseClone() as MilkCriteria;}}public class WaterCriteria : DrinkCriteria{//Concrete Prototype2 in UMLpublic override string QueryTable { get { return "Water"; } }public override DrinkCriteria Clone(){return MemberwiseClone() as WaterCriteria;}}public class Client{//Client in UML//Set relative criteria at runtimeprivate DrinkCriteria Criteria { get; set; }public void HowToUse(){var newCritera = Criteria.Clone();//newCritera.StartDate = 2013-1-1;//newCritera.EndDate = 2013-3-31;//Start to query user new criteria
        }}
}