Key features

Visual Studio 2019+, Visual Studio Code, Ryder, SharpDevelop 3 and others (MSBuild targets support is required)
ASP.NET Core
WPF (built-in INotifyPropertyChanged, INotifyCollectionChanged, IDataErrorInfo implementation)
Open, extendable architecture (built-in IoC container, custom IoC containers support)
Built-in logging framework, custom loggers are supported through IoC

Code-First approach with attribute-based mappings
Wide range of supported standard .NET types including Nullable<T>, TimeSpan & Enums
Entities, Structures (aka ValueTypes), persistent interfaces, closed and open generic classes
Persistent collections (EntitySet<TEntity>)
Unidirectional and bidirectional associations with automatic inverse support and referential integrity checks
Built-in validation with declarative business rules runs in "Continious", "On Demand" or "On Commit" modes
Global & local lifecycle events
Unified Key object

Automatic maintenance of database schema: tables, foreign keys, constraints, indexes, sequences/generators, full-text indexes
Wide range of supported primary key types: int, long, string, guid, etc.
Composite primary keys
"Single Table", "Class Table", "Concrete Table" inheritance schemes support
Declaratively defined unique, non unique, full-text indexes
Arbitrary type discriminators
Large inheritance hierarchies support (efficient JOINs for TPT)

Automatic traversal through Entity references & EntitySets
Subqueries (aggregates, correlated & non-correlated subqueries)
Left Outer joins
Large local collections support
Projections (non-tail projections, subqueries, anonymous types, custom types aka DTO)
Order by and Group by reference field, anonymous types, aggregate, member of enum
Take/Skip operators
Built-in full-text queries support
Custom extensions
Direct SQL commands execution

DataObjects.Net	Online Resources	Add-ons and Tools	Subscribe to news
Overview Key features Testimonials Release history Prices	Support forum Documentation Team blog ORMeter	Entity model designer Extensions