When MEF meets Silverlight

When MEF meets Silverlight
AmrElsehemy
amr.elsehemy@me.com
1

Speaker
TA at Faculty of Information and Computer Science Ain Shams University
Senior Software Engineer at ITWorx
MCSD, MCPD + more.
2

What's MEF?
The Managed Extensibility Framework
“The Managed Extensibility Framework (MEF) is a new library in .NET 4 / Silverlight 4 for building applications that can be incrementally extended” – mef team
“An extensible framework for composing applications from a set of loosely-couple parts discovered and evolving at run-time” – mtaulty
3

WhywasMEF built?
4
I need A
Put the D
Can I have C
F
E
F
B
A
App
C
G
D
Add B
G
Then get me E

Why MEF
For customers
For you and your team
Always there, always ready
In the framework!
5

MEF Basics…
6
An Application is built of parts

Demo
Building our thing
7

3 Magic steps
Export it
Import it
Compose it
8

Export it
9
[Export(typeof(IThing))]
publicclassThing
{
}
IThing
Export
9

Import it
10
publicclassMainPage
{
[Import(typeof(IThing))]
publicIThing thing;
}
IThing
Import
10

Compose it
11
publicclassMainPage
{
publicMainPage()
{
CompositionInitializer.SatisfyImports(this);
}
Compose
11

Demo
Giving more
12

Import it - Metadata
13
[ImportMany]
publicIEnumerable<Lazy<IThing, IThingMetadata>> somethings;
IThing
ImportMany

Export it - Metadata
14
[ExportMetadata("Position", ThingPosition.Left)]
[Export(typeof(IThing))]
publicpartialclassThing
{
}
Put me in the left
IThing
Export

Customize it – Custom exports
15
[ThingExport(Position = ThingPosition.Left)]
publicclassThing
{}
Put me in the left
IThing
Export
15

Demo
Exploring the catalogs
16

TypeCatalog
AssemblyCatalog
AggregateCatalog
Compose it – Catalogs
17

Demo
Trim your apps break up your xaps
18

Recomopose- DeploymentCatalog
Recomposition is key in Silverlight apps
Initial download, small in size.
Download more functionality.
A special Silverlight catalog DeploymentCatalog.
Trace changes with IPartImportsSatisfiedNotification
19

MEF here, there, everywhere
Samples
20

MEF versions
.NET Framework shipping with Silverlight4
.NET Framework 4 shipping with VS 2010
Silverlight 3 & .NET Framework V3.5 SP1
Source on Codeplex (MSPL)
21

Resources
silverlight.net
mef.codeplex.com
mefcontrib.codeplex.com
blogs.msdn.com/gblock
mtaulty.com – He is awesome!
channel9.msdn.com/tags/learnMEFSL4
22

Questions?
23

Thank you
24
Contacts
amr.elsehemy@me.com
twitter @amrelsehemy
Blog http://amrelsehemy.net

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When MEF meets Silverlight

by Amr Elsehemy on Mar 01, 2010

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When MEF meets Silverlight — Presentation Transcript