Created
August 2, 2015 07:26
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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Threading.Tasks; | |
| namespace NullObjectDesignPattern | |
| { | |
| // Bad design example | |
| abstract class Customer { public virtual string Name { get; set; } } | |
| class GoldCustomer : Customer { public GoldCustomer(string name) { Name = name; } } | |
| class DiamondCustomer : Customer { } | |
| class Enquiry : Customer | |
| { | |
| public override string Name { get; set; } | |
| } | |
| class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| var nullOrDefaultCustomerObject = new Enquiry { Name = "Not a customer yet." }; | |
| var customerFactory = new Factory<Customer>(nullOrDefaultCustomerObject); | |
| // will fall back to default | |
| var goldCustomer1 = customerFactory.Create<GoldCustomer>(); | |
| Console.WriteLine($"{goldCustomer1.Name}, {goldCustomer1.GetType().Name }"); | |
| // will be a gold customer | |
| var goldCustomer2 = customerFactory.Create<GoldCustomer>("John Doe"); | |
| Console.WriteLine($"{goldCustomer2.Name}, {goldCustomer2.GetType().Name }"); | |
| Console.ReadKey(); | |
| } | |
| } | |
| } |
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