asp.net 组合模式的一个例子

);
customerIsActive = new CustomerActiveSpecification();
customerHasLateFees = new CustomerHasLateFeesSpecification();
}
/// <summary>
/// 用户租赁DVD数量
/// </summary>
public int TotalRentNumber
{
get;
set;
}
/// <summary>
/// 账户是否激活
/// </summary>
public bool IsActive
{
get;
set;
}
/// <summary>
/// 用户之前是否还欠费
/// </summary>
public decimal LateFees
{
get;
set;
}
public bool CanRent()
{
ISpecification<Customer> canRent = customerIsActive.And(hasReachedRentalThreshold.Not()).And(customerHasLateFees.Not());
return canRent.IsSatisfiedBy(this);
}
}
}