MVC The Good, The Bad and the Evil Hadi Hariri Developer & - PowerPoint PPT Presentation

MVC The Good, The Bad and the Evil Hadi Hariri Developer & Technical Evangelist JetBrains http://hadihariri.com http://twitter.com/hhariri

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Fallacy of Visual Productivity 12 Maintainability Factor 10 8 6 4 2 0 0 5 10 15 Drag’n’Drop Features

Model View Controller

Separation of Concerns…

You’d think we learned…

…one of many anti -patterns

Single Responsibility Principle

Write thy controllers so as tests shall not be needed

Controller Responsibilities  Data conduit between View/Model

Things to avoid  Everything that’s not data passing  Avoid repetitive tasks  Validations  Checks

DRY up Controllers  Aspect Orientated Programming  Filters in MVC  Attribute  Filter Provider  Global Filters

Filters OnActionExecuting OnActionExecuted  Action  OnResultExecuting OnResultExecuted

Unknown Record DEMO

Http Authentication DEMO

Tight Coupling

IoC DEMO

Startup Tasks - Cleaning up Global.asax DEMO

Startup Tasks - Containers DEMO

NuGet  Create isolated infrastructure packages  Pluggable and Discoverable via  IoC  MEF

The Model

Model Options  Domain Model  Dynamic Model  View Model

Domain Model

How to perform Partial Updates?

Where to place Extra Data?

Dynamic Model

Dynamic Model

View Model

Benefits of View Model  Clear Intentions  Ability for Extra Data  Ability for Partial Updates  Scaffolding Support

Downside of View Model  Extra Mapping  Somewhat unnecessary Class explosion

When we map we DRY

AutoMapper DEMO

Conventions and Model Lookups DEMO

Overall: Convention / Compromise

Coping with Complex Sites

RenderAction – RenderPartial DEMO

RESTifying your application

ASP.NET MVC 4

The “API” Controller  MVC for UI  Offers “REST” extensibility out of the box  Web API for API Controller  Offers “REST” features out of the box

MVC 4 (not Web API)  Via extensibility  Content Negotiation  Caching  Routing  Hypermedia (not in Web API either)

EasyMVC: Conventions for routing and more DEMO

Other things to watch out for  Better Validation  FluentValidation  Script Organization  Bundling in MVC 4  Async Controllers  Controllerless Actions

Any framework / language can and will allow bad code

Thank you!