It’s the number one language employers are looking for and gives you 4x more job opportunities than C#. Misconceptions about repository pattern. In my case unit tests are needed, so I want to make sure I am using it in correct manner and there won't be performance bottlenecks in the future. By using the repository pattern, the way you save /get your entity is kept out of the entity code, i.e. Using Repository and Unit of Work patterns with Entity Framework 4.0 on the Entity Framework team blog. Perhaps you’re using SQL Server to store a bunch of TO-DO list items in a table. What they mean is that it allows you to unit test the business layer. A repository is a replacement for data access layer. The Repository Pattern is one of the most popular design patterns used for abstracting how data is eventually persisted in the database or retrieved … With the repository pattern we can add a thin layer of abstraction for accessing the people and company databases. Unit Testing. The repository pattern is a strategy for abstracting data access. Repository pattern allows you to choose the technology that fits the current use case. Repository pattern should not be used if you are using Entity Framework. That means that one repository object is related to one table in database. Implementation. 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. As far as we know, Software design patterns are the some best practices for designing & maintain code in a better and reusable way. So, to dicect that a bit, data access is made up of the code in an application that deals with storing and retrieving data. Implementing Repository Pattern The repository pattern adds an abstraction layer over the top of data access. A little bit of abstraction goes a long way. The Repository Design Pattern, defined by Eric Evens in his Domain Driven Design book, is one of the most useful and most widely applicable design patterns ever invented. If you have any problem with an insert or update operation you know that there is just one point to check the unexpected behavior. Generic repository is simple contract defined as an interface on per object basis. 4 Common Mistakes with the Repository Pattern. I have read a lot that Repository pattern is sometimes bad and it should be used only if unit tests are needed. The Repository Pattern allows us to keep our code more maintainable. Integration with Generic Repository Pattern I won’t fully dive into generic repository pattern here but if you’re not familiar, you can learn more about it here . There are so many misconceptions among people about implementing the repository pattern. For more information about the repository pattern, see the following resources: The Repository Pattern on MSDN. These can be users, products, networks, disks, or whatever your application is about. For an introduction to TDD with an MVC application that uses the repository pattern, see Walkthrough: Using TDD with ASP.NET MVC. Enough talking now; let’s jump into the practical or demo application. Then CompanyLogic or any other logic can leverage those abstractions. Any application has to work with persistence and with some kind of list of items. 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. When talking about Repository pattern it is important to distinguish between DDD implementation of repository and generic repository pattern. your domain keeping it cleaner and in essence achieving persistence ignorance (or going a long way towards it anyway) So answers: The repository approch is much better; Always go for option 1; Add these methods to the repository class The repository design pattern is one of the design patterns in Software design pattern paradigm.