Going towards inversion of control and better design

Going towards Inversion of Control and better design Omar AL Zabir

Typical code public class CustomerManager { public void Insert(Customer customer) { CustomerData data = new CustomerData(); var newCustomer = data.Insert(customer); Logger.Log("New customer inserted" + newCustomer.Name); Mailer.SendWelcomeMail(newCustomer); return newCustomer; } } Here’s a typical example of code we usually do: A business layer class A data access layer class Utility class

Problems? ,[object Object],[object Object],[object Object]

Solution ,[object Object],class CustomerManager { private ICustomerData _customerData; private ILogger _logger; private IMailer _mailer; public CustomerManager( ICustomerData customerData, ILogger logger, IMailer mailer) { _customerData = customerData; _logger = logger; _mailer = mailer; } public void Insert(Customer customer) { _customerData.Insert(cusotmer); _logger.Log("New customer inserted"); _mailer.SendWelcomeMail(customer); } }

Design is much better, less coupling

Principles ,[object Object],[object Object],[object Object]

Pains ,[object Object],[object Object],CustomerManager manager = new CustomerManager( new CustomerData(), new Logger(), new Mailer());

Solution ,[object Object],public class CustomerManager { private ICustomerData _customerData; private ILogger _logger; private IMailer _mailer; public CustomerManager() : this(new CustomerData(), new Logger(), new Mailer()) { } public CustomerManager(ICustomerData customerData, ILogger logger, IMailer mailer) {

Wrong! ,[object Object],[object Object]

What’s a Container ,[object Object],[object Object],[object Object]

Registering in container ,[object Object],Global.asax Application_Start() { Container.Register< ILogger , Logger2 >(); Container.Register< ICustomerData , CustomerDataLinqToSql >(); }

Using Container ,[object Object],public class CustomerManager { private ICustomerData _customerData; private ILogger _logger; private IMailer _mailer; public CustomerManager() : this( Container.Resolve<ICustomerData>(), Container.Resolve<ILogger>(), Container.Resolve<IMailer>() ) { } public CustomerManager(ICustomerData customerData, ILogger logger, IMailer mailer) {

Benefits? ,[object Object],[object Object],[object Object],[object Object]

What problems does this solve? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Common reactions to this ,[object Object],[object Object],[object Object],[object Object]

More common reactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How do you know you are doing it right? ,[object Object],[object Object],[object Object]

Going towards inversion of control and better design

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