Missing Features in Entity Framework Core 1

Here’s a brief summary of some of the features that were present in previous versions of Entity Framework (6.x) and were excluded (or are not yet implemented) in Entity Framework Core 1:

Feature Description Reason/Workaround
Lazy loading The ability to load entity relations after the root entity was loaded, automatically

Will be available in a future version. For now, we need to use eager loading (Include).

https://github.com/aspnet/EntityFramework/issues/3797

Explicit loading The ability to load entity relations after the root entity was loaded, explicitly

Will be available in a future version. For now, we need to use eager loading (Include).

https://github.com/aspnet/EntityFramework/issues/3797

Support for Group By Specifying GroupBy in a LINQ query

Currently it falls back silently to LINQ to Objects, meaning, brings everything from the database and groups in memory. Will be available in a future version. For now, use plain SQL.

https://github.com/aspnet/EntityFramework/issues/2341

Support for user defined functions

Using static methods as UDFs

The ability to use .NET static methods as User Defined Functions (DbFunctionAttribute) is not supported now. Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/4319

DateTime Operations and common SQL functions Doing DateTime operations and using common SQL functions in LINQ

The ability to do queries involving Date/Time operations (DbFunctions) and common SQL functions (SqlFunctions) in LINQ queries is not supported now. Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/2850

Complex Values Support for properties of complex types (value objects)

The ability to use properties of complex types is not supported yet. Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/246

Many to Many Collections Many-to-many relations without a middle entity/table

Will be available in a future version. For now, we need a middle entity and table.

https://github.com/aspnet/EntityFramework/issues/1368

Table Per Type Inheritance Strategy

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/2266

Table Per Concrete Type Inheritance Strategy

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/3170

Mapping CUD with stored procedures The ability to use stored procedures for doing inserts, updates and deletes seemlesly

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/245

Map database views The ability to map views instead of tables

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/1679

https://github.com/aspnet/EntityFramework/issues/827

Spatial data types The ability to query and use spatial data types

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/1100

Custom conventions The ability to add custom conventions

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/214

Populate non-model types from SQL Turn the results of custom SQL into classes that are not part of the model

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/240

Connection resiliency support The ability to retry connecting and sending queries

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/237

Seeding data in migrations The ability to add data when migrating

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/629

Command and query interception The ability to intercept queries and SQL commands

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/626

https://github.com/aspnet/EntityFramework/issues/4048

https://github.com/aspnet/EntityFramework/issues/737

Visual Studio support for generating/updating entities from the database and viewing the model The ability to generate the model from the database from inside Visual Studio and to view the model graphically

Will be available in a future version.

https://github.com/aspnet/EntityFramework/issues/1186

Database initializers Database initializers Dropped.
Automatic migrations Automatic migrations Dropped.
Pluralization Service Pluralization Service

Dropped.

https://github.com/aspnet/EntityFramework/issues/2506

ObjectContext events SavingChanges and ObjectMaterialized events of ObjectContext

Dropped.

https://github.com/aspnet/EntityFramework/issues/3204

ObjectContext (Entity SQL) Entity SQL Dropped.
Model first approach Model first approach Dropped.
Data Annotations validations The ability to perform data annotations validations before saving changes Dropped.

Please let me know if you think I missed something! Winking smile

For the most up to date roadmap, please consult the EF Core roadmap: https://github.com/aspnet/EntityFramework/wiki/Roadmap.

Also, do check out the Entity Framework issue tracker: https://github.com/aspnet/EntityFramework/issues

Published by

Ricardo Peres

Technical Evangelist at Simplifydigital. Microsoft MVP.

Leave a Reply

Your email address will not be published. Required fields are marked *