The Repository pattern is a simple abstraction around permanent storage. The Repository pattern is a popular way to achieve separation between the physical database, queries and other data access logic from the rest of an application. See [appendix_csvs] for an example. It’s meant to be a general guidance. The main point in Repository pattern is that, from the client/user perspective, it should look or behave as a collection. ... ” from inside a Dao is very bad practice. The Repository pattern is slightly different from Dao and focuses on caching data that has been loaded from the data access layer. Unit Testing. This data store can be a database, an xml file, etc. Its such a simple concept, but developers create artificial constraints in their design. With the repository pattern, you would only need to change one object and one repository. That doesn’t necessarily mean 0, but just heading in that general direction. With the Repository Pattern, your goal is to build CRUD functionality that can be reused with as little copying and pasting as possible. Also, I agree with you that the repository pattern in Google’s example can be labelled as an anti-pattern and you clearly make your point. If you using a Repository pattern, you not allowed to create a validation in a Controller or in the Repository itself, it must be separate. What they mean is that it allows you to unit test the business layer. Repository pattern allows you to choose the technology that fits the current use case. It’s the number one language employers are looking for and gives you 4x more job opportunities than C#. How to use repository in a sentence. If you ask 10 developers to design a Repository Pattern from scratch, you would get 10 different patterns. Read on to learn how to use Repository pattern in C# within the context of Entity Framework and ASP.NET MVC. Perhaps it would help to think about why you would use the repository pattern. You have a single place responsible for a set of tables (usually) The repository gives you the illusion of a collection of in-memory objects. UPDATE (Nov 5 2018): While you’re here to become a better C# developer, I strongly recommend you to watch my Python tutorial on YouTube.Python is super-hot these days. What is meant by behaving like a collection is not that it has to be instantiated like Collection collection = new SomeCollection(). Here are some reasons: You have a single place to make changes to your data access. The impact is very small. However, since article centred around Google’s example, the conclusion seems to generalise: “So, repository in Android evolved to become an anti-pattern… Repository definition is - a place, room, or container where something is deposited or stored : depository. However, this doesn’t mean that Dao is a bad design pattern, it just means that this is an incorrect implementation of it. It makes it easy to create a FakeRepository for testing and to swap fundamental details of your infrastructure without disrupting your core application. That is the biggest problem with the Repository Pattern. In using the Repository design pattern, you can hide the details of how the data is eventually stored or retrieved to and from the data store. Lets go through some common mistakes. If your goal is to head north, it’s okay if every turn you make isn’t 100% north. 4 Common Mistakes with the Repository Pattern. When people talk about Repository pattern and unit tests, they are not saying that the pattern allows you to use unit tests for the data access layer. Like collection collection = new SomeCollection ( ) Framework and ASP.NET MVC and to fundamental! That fits the current use case data store can be reused with as little copying and pasting as.. 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