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DbContext Class
https://learn.microsoft.com/dotnet/api/microsoft.entityframeworkcore.dbcontext
 

Compare EF Core & EF6.x
https://learn.microsoft.com/ef/efcore-and-ef6/index
 
Infrastructure in Entity Framework Core from a DDD perspective 
From a DDD point of view, an important capability of EF is the ability to use POCO domain entities, 
also known in EF terminology as POCO 
code-first entities
. If you use POCO domain entities, your 
domain model classes are persistence-ignorant, following the 
Persistence Ignorance
 and the 
Infrastructure Ignorance
 principles. 
Per DDD patterns, you should encapsulate domain behavior and rules within the entity class itself, so 
it can control invariants, validations, and rules when accessing any collection. Therefore, it is not a 
good practice in DDD to allow public access to collections of child entities or value objects. Instead, 
you want to expose methods that control how and when your fields and property collections can be 
updated, and what behavior and actions should occur when that happens. 
Since EF Core 1.1, to satisfy those DDD requirements, you can have plain fields in your entities instead 
of public properties. If you do not want an entity field to be externally accessible, you can just create 
the attribute or field instead of a property. You can also use private property setters. 
In a similar way, you can now have read-only access to collections by using a public property typed as 
IReadOnlyCollection
, which is backed by a private field member for the collection (like a 
List
) in your entity that relies on EF for persistence. Previous versions of Entity Framework 
required collection properties to support 
ICollection
, which meant that any developer using the 
parent entity class could add or remove items through its property collections. That possibility would 
be against the recommended patterns in DDD. 


246 
CHAPTER 6 | Tackle Business Complexity in a Microservice with DDD and CQRS Patterns 
You can use a private collection while exposing a read-only 
IReadOnlyCollection
object, as 
shown in the following code example: 

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