What effect(s) can the virtual keyword have in Entity Framework 4.1 POCO Code First?

by

So far, I know of these effects.

  • Lazy Loading: Any virtual ICollections will be lazy-loaded unless you specifically mark them otherwise.

  • More efficient change tracking. If you meet all the following requirements then your change tracking can use a more efficient method by hooking your virtual properties. From the link:

    To get change tracking proxies, the
    basic rule is that your class must be
    public, non-abstract or non-sealed.
    Your class must also implement public
    virtual getters/setters for all
    properties that are persisted.
    Finally, you must declare collection
    based relationship navigation
    properties as ICollection<T> only.
    They cannot be a concrete
    implementation or another interface
    that derives from ICollection<T> (a
    difference from the Deferred Loading
    proxy)

Another useful link describing this is MSDN’s Requirements for Creating POCO Proxies.

More Related Contents:

  1. Possible to default DateTime field to GETDATE() with Entity Framework Migrations?
  2. How to convert DbSet in Entity framework to ObjectQuery
  3. Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths – why?
  4. Unique key with EF code first
  5. Ignoring a class property in Entity Framework 4.1 Code First
  6. Entity Framework Join 3 Tables
  7. The specified type member is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported
  8. EF Including Other Entities (Generic Repository pattern)
  9. How Should I Declare Foreign Key Relationships Using Code First Entity Framework (4.1) in MVC3?
  10. Entity Framework: Where do I extend the CSDL/MSL?
  11. Should I enable or disable dynamic proxies with entity framework 4.1 and MVC3?
  12. How do I detach objects in Entity Framework Code First?
  13. EF Code First – how to set identity seed?
  14. Order navigation properties when using Include and/or Select methods with EF 4.1 Code-First?
  15. Using DateTime properties in Code-First Entity Framework and SQL Server
  16. How to set default value for POCO’s in EF CF?
  17. How to map table splitting in EF Code First?
  18. Entity Framework creates a plural table name, but the view expects a singular table name?
  19. Composite Key with EF 4.1 Code First
  20. How do I define a database view using Entity Framework 4 Code-First?
  21. EF4 Code First: how to add a relationship without adding a navigation property
  22. Enums with EF code-first – standard method to seeding DB and then using?
  23. Convert DBContext to ObjectContext for use with GridView
  24. Set database collation in Entity Framework Code-First Initializer
  25. How to use Entity Framework to map results of a stored procedure to entity with differently named parameters
  26. Foreign keys in entity framework 4.1
  27. Model First with DbContext, Fails to initialize new DataBase
  28. Entity Framework: Set Delete Rule with CodeFirst
  29. Entity Framework many-to-many self-reference
  30. Integration Testing Entity Framework code first with in-memory database

Leave a Comment