Fun with ASP.NET MVC 3, MEF and NuGet (#comdaybe)

Fun with ASP.NET MVC 3,MEF and NuGet
Pure application LEGO
Maarten Balliauw
AZUG / VISUG
@maartenballiauwhttp://blog.maartenballiauw.be

Notes (hidden)
So you have a team of developers… And a nice architecture to build on… How about making that architecture easy for everyone and getting developers up to speed quickly? Learn all about integrating the managed extensibility framework (MEF) and ASP.NET MVC with some NuGet sauce for creating loosely coupled, easy to use architectures that anyone can grasp.
So what’s this talk about?
Show you how you can build an app like Lego
Show you how you can create Lego blocks for your team
This is NOT a “general recommended approach”, just an idea that proved to work at one of our customers.

Who am I?
Maarten Balliauw
Antwerp, Belgium
www.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 used
ASP.NET MVC 3
Managed Extensibility Framework (MEF)
NuGet
Creating application components
Building an application
Conclusion
Further information
Q&A

ASP.NET MVC 3
All the new stuff:
Razor view engine
Global Action Filters
Unobtrusive Ajax & Client Validation
Better Visual Studio tooling
And a very interesting one for doing LEGO development:
Better support for Dependency Injection

var partA =new PartA(new PartB())
Dependency Injection?
I need a “Part B” !
Coming up!
Part A
Me on a typicalwork day

Container
Dependency Injection?
I need a “Part B” !
Let me see...
There you go!
Part A
Part B

What about ASP.NET MVC 3?
ASP.NET MVC 3 uses DependencyResolver
: IDependencyResolver
GetService()
GetServices()
Register it on application start

What about ASP.NET MVC 3?
ASP.NET MVC will / can query the IDependencyResolver for
Controllers
View engines & view pages
Filters
Model validators
Model 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 providers
Model binders
Controller activator
View page activator

in ASP.NET MVC 3
Dependency Injection

Managed ExtensibilityFramework (MEF)
Cool as ICE: Import, Compose, Export
[Import]IRule rule;
MEF catalog
HomeController
[Export(typeof(IRule)]
Let me see...
There you go!
SomeRuleImpl
MEF container

MEF in ASP.NET MVC 3
Build an IDependencyResolver
based on MEF container
Use
has a built-in IDependencyResolver
has a “Convention” model
is available on NuGet
mefcontrib.codeplex.com

A brief NuGet introduction...
Package management system for .NET
Simplifies incorporating 3rd party libraries
Developer focused
Free, open source
Use packages from the official feed
Publish your own packages
Create & use your own feed

and finding it on NuGet
Using MefContrib

MefContrib.MVC3
Optional addition for
Adds some things to your application:
AppStart code that does the wiring
A CompositionDependencyResolver
Will check all assemblies in /bin
Will export everything : IController by convention

Conventions based model
public class MvcApplicationRegistry : PartRegistry { public MvcApplicationRegistry() {
Scan(x => {
x.Assembly(Assembly.GetExecutingAssembly());x.Directory(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, thinking

application components
Creating

What’s next?
Building it
MSBuild (or whatever! Nuget.exe is all that matters)
Hosting it
Create a NuGet server
Drop everything in a folder
Use a NaaS solution: www.myget.org
Using it
Reference the feed
Download & install components needed
Assemble using MEF (or another IoC)
Install-Package NuGet.Server

A quick commercial plug
Create your own NuGet feed
Packages from official feed
Uploaded/pushed packages
No need to setup & maintain your own NuGet Server
Free! www.myget.org

a private NuGet feed
Creating it the lazy way

Let’s see if we can build this...
Wiredwith MEF
Packagedas .nupkg

Cover Sheet Generator
Building an application

Conclusion
You can build an app like a Lego set
Requires “bricks” (NuGet packages)
Requires “glue” (MEF / MefContrib / IoC)
Requires you to think in terms of components
Structure is key!
Not a best-practice architecture
Just something we toyed with on a project
Proved to work (for the customer)

Further information
On the Internet:
www.nuget.org
www.myget.org
mefcontrib.codeplex.com

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http://blog.maartenballiauw.be
@maartenballiauw
Me, having a question

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Fun with ASP.NET MVC 3, MEF and NuGet (#comdaybe)

by Maarten Balliauw on Jun 24, 2011

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