Benefits The context uses the unit of work pattern and each DBSet is a repository. Unit of Work là má»t ká»¹ thuáºt Äá» Äáº£m báº£o táº¥t cáº£ các request tá»i database mà có liên quan tá»i nhau Äá»u ÄÆ°á»£c thá»±c hiá»n trên cùng má»t DbContext 1. What I do in a case like this is build a small app to try out a new approach. Jun 25, 2013 03:03 AM | usman.khalid87 | LINK. 3. What Rob calls ‘this over-abstraction silliness’. This problem isn’t special to using DTOs or AutoMapper, but is a common issue in EF that you can fall over even if hand coding the update. It provides lot of benefits. The last one is working with the AdventureWorksLite2012 database which is a database with both linked classes and composite keys, as described in this article https://www.simple-talk.com/dotnet/asp.net/using-entity-framework-with-an-existing-database–user-interface/. As you say in the second part of this article (see https://thereformedprogrammer.net/is-the-repository-pattern-useful-with-entity-framework-part-2/) I do indeed use DTOs between the EF (Entity Framework) and the Ui/WebApi layer. ), Avoid repeat writting same LINQ statement for same query. See some very interesting comments he made on a detractor’s blog â¢Hide EF from upper layer Entity Framework Core already serves as unit of work. Enjoy! @DDiVita How often would you realistically change the ORM you are using? Imagine an app with hard coded references to "c:\windows\fonts" and the problems that can cause. I have now created a second post which goes into detail on my solution for replacing the Repository pattern. 3) The two main benefits of a Dao are (i) Encapsulating data access logic, ie queries and (ii) Hiding your data access implementation, which in this case is Entity Framework. Thanks for your question. The Architecture should be independent of the Frameworks. The Repository pattern is often used when an application performs data access operations. In this blog, I wanted to take some time to walkthrough how to implement a generic Repository Pattern and the Unit of Work Pattern using Entity Framework 6. hmm, I still don't really understand why one repository per aggregate root object part. After working again on codebase where Entity Framework Core was used through repository and unit of work patterns I decided to write eye-opener post for next (and maybe even current and previous) generations about what Entity Framework has to offer in the light of these to patterns. edition covers EF Core 5. Isn't when I use entity framework to query an order object, the order will contains a list of order lines...? It still needs thought, but it is doable. AutoMapper only makes it harder as the ‘simple’ answer looks fine from the outside. I already have wrote an article for repository and entity framework. â¢Make code better testable. Benefit of Unit of Work and Repository Pattern with Entity Framework. See http://visualstudiomagazine.com/blogs/tool-tracker/2013/11/updating–entities-with-automapper.aspx. After reading the above article on UoW/repository pattern, which touched on DTO’s, I’d like to know how you’ve implemented I should also say I found another blog, ‘Say No to the Repository Pattern in your DAL’ which, says that using a repository removes access to Linq querying, ability to include/prefetch or aync support (EF 6). Long answer, but an interesting architectural issue I have grappled with quite a bit. But I wrote it because it's one of the advantages with the repository pattern. Therefore you donât have to implement it yourself. The GraphDiff looks like a great find – thanks for bringing that to my attention and I will have a look at it. I am a freelance .NET Core back-end developer. I really like this sentence in your blog post: ". Especially when it comes to saving entities which also have changes in related entities. Basically you create an interface for your repository, and you reference the interface for it when you are making the object. However EF has come a long way since then. What if you decide to change ORMs or have several data sources as @eranotzap suggested? Asking for help, clarification, or responding to other answers. I talked about that here: EF(v6.1 in my case) makes hard work of this as it does not persist(add,update or delete) related entities re-attached to the DbContext – you have to do all the hard work, working out the changes to get the persistence to cascade. This was an other simpler way to design the repository. Hello, >> 1) What is the advantage and disadvantage of Entity Framework.