Fun with ASP.NET MVC 3, MEF and NuGet

Maarten BalliauwTechnical ConsultantRealDolmen@maartenballiauw

OPN07

Who am I?

Maarten BalliauwAntwerp, Belgiumwww.realdolmen.com Focus on web

ASP.NET, ASP.NET MVC, PHP, Azure, …MVP ASP.NET

http://blog.maartenballiauw.be @maartenballiauw

Me, looking intelligent with glasses

Agenda

Technologies & techniques usedASP.NET MVC 3Managed Extensibility Framework (MEF)NuGet

Creating application componentsBuilding an applicationConclusionFurther informationQ&A

ASP.NET MVC 3

All the new stuff:Razor view engineGlobal Action FiltersUnobtrusive Ajax & Client ValidationBetter Visual Studio tooling

And a very interesting one for doing Lego development:

Better support for Dependency Injection

var partA =new PartA(new PartB())

Sidenote: Dependency Injection?

Part A

I need a “Part B” !

Me, doing actual software development

Coming up!

Container

Sidenote: Dependency Injection?

Part A

I need a “Part B” !

Part B

Let me see...

There you go!

How does this fit into ASP.NET MVC 3?

ASP.NET MVC 3 uses DependencyResolver

: IDependencyResolverGetService()GetServices()

Register it on application start

How does this fit in ASP.NET MVC 3?

ASP.NET MVC will / can query the IDependencyResolver for

ControllersView engines & view pagesFiltersModel validatorsModel metadata

Check Brad Wilson’s blog for examples on all of these

http://bradwilson.typepad.com/blog/2010/07/service-location-pt1-introduction.html

Value providersModel bindersController activatorView page activator

Dependency Injection in ASP.NET MVC 3

demo

Managed Extensibility Framework (MEF)

Cool as ICE: Import, Compose, Export

MEF catalogHomeController

[Import]Ilogger logger;

ConsoleLogger

[Export(typeof(Ilogger)]

MEF container

Let me see...

There you go!

Options for MEF in ASP.NET MVC 3

Build an IDependencyResolverbased on MEF container

Use MefContribhas a built-in IDependencyResolverhas a “Convention” modelis available on NuGetmefcontrib.codeplex.com

A brief NuGet introduction...

Package management system for .NETSimplifies incorporating 3rd party librariesDeveloper focusedFree, open source

Use packages from the official feedPublish your own packagesCreate & use your own feed

Using MefContrib

And finding it. On NuGet.

demo

MefContrib.MVC3

Optional addition for MefContribAdds some things to your application:

AppStart code that does the wiringA CompositionDependencyResolverWill check all assemblies in /binWill export everything : IController by convention

Conventions in MefContrib-MVC3public class MvcApplicationRegistry : PartRegistry { public MvcApplicationRegistry() { Scan(x => { x.Assembly(Assembly.GetExecutingAssembly()); x.Directory(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "bin")); });

Part() .ForTypesAssignableFrom<IController>() .MakeNonShared() .ExportTypeAs<IController>() .ExportType() .Imports( // ... ); }}

This all makes me think...

Package company components using NuGet?Distribute them in a custom feed?Use ASP.NET MVC 3?Wire everything with MEF & MefContrib?Pure application Lego!

Me, actually thinking

Creating application components

Initech Default Theme

demo

What’s next?

Building itMSBuild (or whatever! Nuget.exe is all that matters)

Hosting itCreate a NuGet serverOr drop everything in a folder

Using itReference the feedDownload & install components neededAssemble using MEF (or another IoC)

Install-Package NuGet.Server

Let’s see if we can build this...

TPS Reports Cover Sheet Generator (ASP.NET MVC 3)

Domain layer

Domain.TpsReports

Authentication

AccountController

Contracts

And their implementations..

.

Theme

Default theme

Packagedas .nupkg

Wiredwith MEF

Building an application

TPS ReportsCover Sheet Generator

demo

Conclusion

You can build an app like a Lego setRequires “bricks” (NuGet packages)Requires “glue” (MEF / MefContrib / other IoC)

Requires you to think in terms of componentsStructure is key!

Not a best-practice architectureJust something we toyed with on a projectProved to work (for the customer)

Further information

For time travelers:FRM06 – Deconstructing Orchard – Bradley Millington – Lagoon L (Tuesday)FRM13 – Scaffolding – Steve Sanderson – Breakers H (Wednesday)

Upcoming:FRM09 – NuGet In Depth – Scott Hanselman & Phil Haack –Lagoon H (now)

On the Internet:www.nuget.orgmefcontrib.codeplex.com

Thank you for joining & filling out the evals!

Q&A

Me, having a question

http://blog.maartenballiauw.be @maartenballiauw

Fun with ASP.NET MVC 3, MEF and NuGet

Maarten BalliauwTechnical ConsultantRealDolmen@maartenballiauw

OPN07

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IN THIS PRESENTATION.