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Data Repositories for Entities and Web API Controller

Explore how to create asynchronous data repositories for entity management and implement Web API controllers with HTTP method attributes in ASP.NET Core. Understand CRUD operations, controller action types, and response handling to build scalable web services.

Creating data repositories for entities

Defining and implementing a data repository to provide CRUD operations is good practice. The CRUD acronym includes the following operations:

  • C for Create

  • R for Retrieve (or Read)

  • U for Update

  • D for Delete

We will create a data repository for the Customers table in Northwind. There are only 91 customers in this table, so we will store a copy of the whole table in memory to improve scalability and performance when reading customer records.

Note: In a real web service, we should use a distributed cache like Redis, an open-source data structure store that can be used as a high-performance, high-availability database, cache, or message broker. ... ...