AgileEntity Framework 4

Julie Lerman Agile EF4 November 2009
Agile Entity Framework 4In Two Parts
Julie Lerman
thedatafarm.com/blog
jlerman@thedatafarm.com
Twitter @JulieLermanVT

Agile Entity Framework 4Part 1: POCOs
Julie Lerman

Julie Lerman
website
theDataFarm.com
blog & twitter
theDataFarm.com/blog@julielermanVT
book web site
LearnEntityFramework.com
consultant/mentor
Microsoft MVP, INETA Speaker,ASPInsider, MCP, VTdotNET Leader

Agenda
Creating Simple POCO Classes
Leveraging Proxies
Generate POCO Classes with T4
Code-Only Development
Self-Tracking Entities

EF1 & Default EF4 Classes
CustomTool=EntityModelCodeGenerator

POCO: Shifting the Responsibility
?
ObjectContext
Context.DetectChanges
POCO
Classes
“Snapshot”
OR
EntityObject Proxy
“Proxy Notification”

Basic POCO Support
Turn off code generation from EDMX
“Convention” will auto-map classes/entities

POCO and Other EF Features
Complex Types: Supported
Use a class (no structs) to represent the type
Explicit Loading
ObjectContext.LoadProperty(myObj,”PropertyName”)
ObjectCOntext.LoadProperty(myObj, o=>o.property)
Lazy Loading (new to EF4!)
Declare property as virtual
EF uses a proxy instance at runtime to load

Rules for Proxy Notification
All properties must be virtual
Use ICollection<T> for child collections
ObjectContext.CreateObject<T> for new
Class cannot be sealed
Navigation props cannot be sealed
Class cannot be abstract
Constructor with no parameters

POCO Classes from Model
T4
Text Template Transformation Toolkit

Code-Only Design
Part of the EF Feature CTP
No model at all
Metadata is inferred from classes
Convention by Default
EF will rely 100% on presumptions
Configuration Follows
Tweak configurations to modify behavior

Self-Tracking Entities
Part of Feature CTP
T4 Template to create specialized POCO classes
EntityState is tracked by entity
Specialized methods that know what to expect from the classes
Julia Lerman October 17th 2009, New England Code Camp 12

Resources
LearnEntityFramework.com/resources
blogs.msdn.com/adonet, efdesign, dsimmons, alexj, more...
msdn.microsoft.com/data
Gateway to whitepapers, forums, documentation
Thanks!
Peter Ritchie, James Phillips, Bobby Johnson

Agile Entity Framework 4Part 2: Testing with POCOs
Julie Lerman

Julie Lerman
website
theDataFarm.com
blog & twitter
book web site
consultant/mentor

Classes
EF Classes in a Repository
System.Data.Entity
Mock
ObjectSet
Mock
Context
(Repository A)
EDM &
ObjectContext(Repository A)
Mock
Context(Repository A)
Queries
(Repository B)
UI
Tests

Would you like a
Repository
with those fries?

Resources
LearnEntityFramework.com/resources
blogs.msdn.com/adonet, efdesign, dsimmons, alexj, more...
msdn.microsoft.com/data
Gateway to whitepapers, forums, documentation
Thanks!
Peter Ritchie, James Phillips, Bobby Johnson

Contact
website
theDataFarm.com
blog & twitter
book web site
consultant/mentor

AgileEntity Framework 4

by Julie Lerman

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