Hands-On Design Patterns with C# and .NET Core

The repository pattern

The singleton pattern that is introduced to the project is applied to a class being used to maintain the inventory's collection of books. The singleton will prevent access from multiple threads being handled incorrectly, and, another pattern, the repository pattern, will be used to create a facade over the data that is being managed.

The repository pattern provides an abstraction over a repository to provide a layer between the business logic of an application and the underlying data. This provides several advantages. By having a clean separation, our business logic can be maintained and unit tested independently of the underlying data. Often, the same repository pattern class can be reused by multiple business objects. ...