ASP.NET Core 3 and React

Injecting the data repository into the API controller

We want to interact with an instance of the data repository we created in the previous chapter into our API controller. Let's carry out the following steps to do this:

1. We'll start by adding using statements to the QuestionsController.cs file so that the data repository and its models can be referenced:

using QandA.Data;using QandA.Data.Models;

2. Create a private class-level variable to hold a reference to our repository:

[Route("api/[controller]")][ApiController]public class QuestionsController : ControllerBase{    private readonly IDataRepository _dataRepository;}

We've used the readonly keyword to make sure the variable's reference doesn't change outside the constructor.

3. Let's create ...