Let's do Some DDD With Entity Framework Core 3!
Let's get a handle on DDD Entity Framework!
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Join For FreeA few days ago, Microsoft released Entity Framework Core 3, introducing a lot of improvements in both functionality and performance (and some breaking change as well).
Now, we have full support for very cool stuff like C# 8, Async Enumerables, plus a brand new LINQ provider.
I’ve been using a lot of Entity Framework in my daily job, but of course, before upgrading a project ‘s dependency to a major version, there’s always some testing to do. As I often do, I decided to write a small demo and try out some of these new functionalities. You can find all the sources on GitHub.
My goal for this project was to model a bunch of Aggregates and Value Objects with proper Persistence Ignorance (e.g. I don’t want to pollute my business logic classes with code responsible for storing and retrieving data.
You may also like: How to Configure Entity Framework Caching.
Luckily, Entity Framework Core offers the possibility to configure the Entity/Table mapping using a nice Fluent Interface, avoiding attributes on our properties.
We have basically two options. The first one is to write all the configuration code in the OnModelCreating() method of our DbContext
. It's quick and easy, but it leads to a lot of very confusing code.
A much cleaner option is to use the database diagram generated with https://sqldbm.com:
- Create some products.
- Add just one product to a quote and save it.
- Update the quote adding another product.
- Create an order from that quote.
- Add another product to the quote.
- Create another order from the quote.

In the next post, we’re going to take a look at the code and talk about each Entity configuration. Stay tuned!
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Published at DZone with permission of David Guida. See the original article here.
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