Repository class - this is the generic Repository class.IRepository interface - this interface is the base type for all Repository types.In our implementation of the Repository design pattern, the participating types include the following: In this section we will explore on how we can program the Repository design pattern. Implementing the Repository design pattern in C# For example, the data source layer can be a database, a SharePoint list, or a Web service." The business logic should be agnostic to the type of data that comprises the data source layer. The MSDN states: "Use a Repository to separate the logic that retrieves the data and maps it to the entity model from the business logic that acts on the model. Martin Fowler states: "Mediates between the domain and data mapping layers using a collection-like interface for accessing domain objects."Ī Repository is defined as a collection of domain objects that reside in the memory. You can apply this design pattern to even hide how data that is exposed by a web service or an ORM is accessed. This data store can be a database, an xml file, etc. 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.
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In essence, the Repository design pattern facilitates de-coupling of the business logic and the data access layers in your application with the former not having to have any knowledge on how data persistence would actually take place.
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The knowledge of this persistence, i.e., the persistence logic, is encapsulated inside the Repository. It will persist your objects sans the need of having to know how those objects would be actually persisted in the underlying database, i.e., without having to be bothered about how the data persistence happens underneath. Design patterns are used as a solution to recurring problems in your applications, and the Repository pattern is one of the most widely used design patterns.