Its such a simple concept, but developers create artificial constraints in their design. ... ” from inside a Dao is very bad practice. Lets go through some common mistakes. Unit Testing. 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. However, this doesn’t mean that Dao is a bad design pattern, it just means that this is an incorrect implementation of it. Here are some reasons: You have a single place to make changes to your data access. It’s the number one language employers are looking for and gives you 4x more job opportunities than C#. It’s meant to be a general guidance. The Repository pattern is slightly different from Dao and focuses on caching data that has been loaded from the data access layer. 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. That is the biggest problem with the Repository Pattern. With the repository pattern, you would only need to change one object and one repository. What is meant by behaving like a collection is not that it has to be instantiated like Collection collection = new SomeCollection(). 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. 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. That doesn’t necessarily mean 0, but just heading in that general direction. The repository gives you the illusion of a collection of in-memory objects. The Repository pattern is a simple abstraction around permanent storage. With the Repository Pattern, your goal is to build CRUD functionality that can be reused with as little copying and pasting as possible. See [appendix_csvs] for an example. 4 Common Mistakes with the Repository Pattern. What they mean is that it allows you to unit test the business layer. 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. You have a single place responsible for a set of tables (usually) This data store can be a database, an xml file, etc. The main point in Repository pattern is that, from the client/user perspective, it should look or behave as a collection. 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. 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. Repository pattern allows you to choose the technology that fits the current use case. It makes it easy to create a FakeRepository for testing and to swap fundamental details of your infrastructure without disrupting your core application. The impact is very small. If your goal is to head north, it’s okay if every turn you make isn’t 100% north. If you ask 10 developers to design a Repository Pattern from scratch, you would get 10 different patterns. How to use repository in a sentence. Repository definition is - a place, room, or container where something is deposited or stored : depository. However, since article centred around Google’s example, the conclusion seems to generalise: “So, repository in Android evolved to become an anti-pattern… Can be reused with as little copying and pasting as possible: you have a place! To head north, it should look or behave as a collection core application look or as! Some reasons: you have a single place responsible for a set of tables ( usually ) Repository. Database, an xml file, etc to head north, it should look or behave a... 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