An example of asp.net Combination Mode

Copy codeThe Code is as follows: using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Text;
Namespace Test
{
Class Program
{
Static void Main (string [] args)
{
Var customer = new Customer
{
IsActive = true,
LateFees = 100 M,
Total1_number = 10
};
Console. WriteLine (customer. CanRent ());
Console. ReadKey ();
}
}
Public interface ISpecification <T>
{
/// <Summary>
/// Can I rent it?
/// </Summary>
Bool IsSatisfiedBy (T entity );
/// <Summary>
/// And operations
/// </Summary>
ISpecification <T> And (ISpecification <T> other );
/// <Summary>
/// No operation
/// </Summary>
ISpecification <T> Not ();
}
/// <Summary>
/// Base class
/// </Summary>
Public abstract class CompositeSpecification <T>: ISpecification <T>
{
Public abstract bool IsSatisfiedBy (T candidate );
Public ISpecification <T> And (ISpecification <T> other)
{
Return new AndSpecification <T> (this, other );
}
Public ISpecification <T> Not ()
{
Return new NotSpecification <T> (this );
}
}
/// <Summary>
/// And operations
/// </Summary>
Public class AndSpecification <T>: CompositeSpecification <T>
{
Private ISpecification <T> leftSpecification;
Private ISpecification <T> rightSpecification;
Public AndSpecification (ISpecification <T> leftSpecification, ISpecification <T> rightSpecification)
{
This. leftSpecification = leftSpecification;
This. rightSpecification = rightSpecification;
}
Public override bool IsSatisfiedBy (T entity)
{
Return leftSpecification. IsSatisfiedBy (entity) & rightSpecification. IsSatisfiedBy (entity );
}
}
/// <Summary>
/// No operation
/// </Summary>
Public class NotSpecification <T>: CompositeSpecification <T>
{
Private ISpecification <T> innerSpecification;
Public NotSpecification (ISpecification <T> innerSpecification)
{
This. innerSpecification = innerSpecification;
}
Public override bool IsSatisfiedBy (T entity)
{
Return! InnerSpecification. IsSatisfiedBy (entity );
}
}
/// <Summary>
/// Determines whether the maximum number of required leases is reached
/// </Summary>
Public class HasReachedMaxSpecification: CompositeSpecification <Customer>
{
Public override bool IsSatisfiedBy (Customer entity)
{
Return entity. totalequalnumber> 5;
}
}
/// <Summary>
/// Activate
/// </Summary>
Public class CustomerActiveSpecification: CompositeSpecification <Customer>
{
Public override bool IsSatisfiedBy (Customer entity)
{
Return entity. IsActive;
}
}
/// <Summary>
/// Whether the account is in arrears
/// </Summary>
Public class CustomerHasLateFeesSpecification: CompositeSpecification <Customer>
{
Public override bool IsSatisfiedBy (Customer entity)
{
Return entity. LateFees> 0;
}
}
Public class Customer
{
Private ISpecification <Customer> hasReachedRentalThreshold;
Private ISpecification <Customer> customerIsActive;
Private ISpecification <Customer> mermerhaslatefees;
Public Customer ()
{
HasReachedRentalThreshold = new HasReachedMaxSpecification ();
CustomerIsActive = new CustomerActiveSpecification ();
CustomerHasLateFees = new CustomerHasLateFeesSpecification ();
}
/// <Summary>
/// Number of DVDs rented by the user
/// </Summary>
Public int TotalRentNumber
{
Get;
Set;
}
/// <Summary>
/// Whether the account is activated
/// </Summary>
Public bool IsActive
{
Get;
Set;
}
/// <Summary>
/// Whether the user is in arrears
/// </Summary>
Public decimal LateFees
{
Get;
Set;
}
Public bool CanRent ()
{
ISpecification <Customer> canRent = customerIsActive. And (hasReachedRentalThreshold. Not (). And (mermerhaslatefees. Not ());
Return canRent. IsSatisfiedBy (this );
}
}
}