class1.cs

来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOptimized项

// Facade pattern -- Real World example  

using System;

namespace DoFactory.GangOfFour.Facade.RealWorld
{
    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            // Facade 
            Mortgage mortgage = new Mortgage();

            // Evaluate mortgage eligibility for customer 
            Customer customer = new Customer("Ann McKinsey");
            bool eligable = mortgage.IsEligible(customer, 125000);

            Console.WriteLine("\n" + customer.Name +
                " has been " + (eligable ? "Approved" : "Rejected"));

            // Wait for user 
            Console.Read();
        }
    }

    // "Subsystem ClassA" 

    class Bank
    {
        public bool HasSufficientSavings(Customer c, int amount)
        {
            Console.WriteLine("Check bank for " + c.Name);
            return true;
        }
    }

    // "Subsystem ClassB" 

    class Credit
    {
        public bool HasGoodCredit(Customer c)
        {
            Console.WriteLine("Check credit for " + c.Name);
            return true;
        }
    }

    // "Subsystem ClassC" 

    class Loan
    {
        public bool HasNoBadLoans(Customer c)
        {
            Console.WriteLine("Check loans for " + c.Name);
            return true;
        }
    }

    class Customer
    {
        private string name;

        // Constructor 
        public Customer(string name)
        {
            this.name = name;
        }

        // Property 
        public string Name
        {
            get { return name; }
        }
    }

    // "Facade" 

    class Mortgage
    {
        private Bank bank = new Bank();
        private Loan loan = new Loan();
        private Credit credit = new Credit();

        public bool IsEligible(Customer cust, int amount)
        {
            Console.WriteLine("{0} applies for {1:C} loan\n",
              cust.Name, amount);

            bool eligible = true;

            // Check creditworthyness of applicant 
            if (!bank.HasSufficientSavings(cust, amount))
            {
                eligible = false;
            }
            else if (!loan.HasNoBadLoans(cust))
            {
                eligible = false;
            }
            else if (!credit.HasGoodCredit(cust))
            {
                eligible = false;
            }

            return eligible;
        }
    }
}