複製程式碼 程式碼如下:
using System;
using ric;
using ;
using ;
namespace Test
{
class Program
{
static void Main(string[] args)
{
var customer = new Customer
{
IsActive = true,
LateFees = 100M,
TotalRentNumber = 10
};
eLine(ent());
Key();
}
}
public interface ISpecification
{
///
/// 是否可以租賃
///
bool IsSatisfiedBy(T entity);
///
/// 與操作
///
ISpecificationAnd(ISpecificationother);
///
/// 否操作
///
ISpecificationNot();
}
///
/// 基類
///
public abstract class CompositeSpecification: ISpecification
{
public abstract bool IsSatisfiedBy(T candidate);
public ISpecificationAnd(ISpecificationother)
{
return new AndSpecification(this, other);
}
public ISpecificationNot()
{
return new NotSpecification(this);
}
}
///
/// 與操作
///
public class AndSpecification: CompositeSpecification
{
private ISpecificationleftSpecification;
private ISpecificationrightSpecification;
public AndSpecification(ISpecificationleftSpecification, ISpecificationrightSpecification)
{
Specification = leftSpecification;
tSpecification = rightSpecification;
}
public override bool IsSatisfiedBy(T entity)
{
return tisfiedBy(entity) && tisfiedBy(entity);
}
}
///
///否操作
///
public class NotSpecification: CompositeSpecification
{
private ISpecificationinnerSpecification;
public NotSpecification(ISpecificationinnerSpecification)
{
rSpecification = innerSpecification;
}
public override bool IsSatisfiedBy(T entity)
{
return !tisfiedBy(entity);
}
}
///
/// 是否達到最大的規定租賃數
///
public class HasReachedMaxSpecification : CompositeSpecification
{
public override bool IsSatisfiedBy(Customer entity)
{
return lRentNumber > 5;
}
}
///
/// 是否啟用
///
public class CustomerActiveSpecification : CompositeSpecification
{
public override bool IsSatisfiedBy(Customer entity)
{
return tive;
}
}
///
/// 是否欠費
///
public class CustomerHasLateFeesSpecification : CompositeSpecification
{
public override bool IsSatisfiedBy(Customer entity)
{
return Fees > 0;
}
}
public class Customer
{
private ISpecificationhasReachedRentalThreshold;
private ISpecificationcustomerIsActive;
private ISpecificationcustomerHasLateFees;
public Customer()
{
hasReachedRentalThreshold = new HasReachedMaxSpecification();
customerIsActive = new CustomerActiveSpecification();
customerHasLateFees = new CustomerHasLateFeesSpecification();
}
///
/// 使用者租賃DVD數量
///
public int TotalRentNumber
{
get;
set;
}
///
/// 賬戶是否啟用
///
public bool IsActive
{
get;
set;
}
///
/// 使用者之前是否還欠費
///
public decimal LateFees
{
get;
set;
}
public bool CanRent()
{
ISpecificationcanRent = (())(());
return tisfiedBy(this);
}
}
}
