How to use DI to use a DbContext in a wrapper class, and inject said wrapper class instead of the DbContext

[IP14Y3RI]

Hi!
I am working on a API and want to utilise the Dependency Injection functionality that is built into ASP.NET Core. However, I am struggling to solve a seemingly simple problem. I am using Entity Framework Core to connect with my MySQL database, and unfortunately, I couldn't exactly find a possible answer to my question.

So I have configured a DbContext.

public class MyContect : DbContext
    {
        public  MyContect (DbContextOptions<MyContect> options) : base(options)
        {
        }
    }

And then in the Startup.cs file, in the ConfigureServices method, I have

services.AddDbContext<MyContext>(options => options.UseMySQL(
                   Configuration.GetConnectionString("DefaultConnection")));

Now in my Controller, I have

public class MyController : ControllerBase{
        private readonly DAO _dao;
        private readonly MyContext _context;

        public AuthController(AuthContext context, )
        {
            this._context = context;
        }
}

Now the instance of MyContext is injected into my controller just fine and it all works.

For testing purposes, I have introduced a new class DAO, which uses a MyContext instance. By doing so, I want that MyController can get injected an instance of DAO instead of getting injected MyContext directly , and I am aiming to inject an instance of MyContext into DAO. In other words; The instance of DAO should use/receive the instanced of MyContext, and MyController should receive the instance of DAO.

Then, the constructor of MyController should look like something like this:

public class MyController : ControllerBase{
        private readonly DAO _dao;
       // private readonly MyContext _context; // No longer needed.

        public AuthController(DAO Dao )
        {
            this._dao = dao;
        }
}

And my DAO class would look like something like this

public class DataAccessObject {
        private readonly AuthContext _context;

        public DataAccessObject(AuthContext context)
        {
            _context = context;
        }

. . .
}

How can I achieve this? What methods do I need to use in Startup.ConfigureServices to do this?

[davidfowl]

You have to tell the container about your DataAccessObject:

services.AddTransient<DataAccessObject>();

Read more about dependency injection here https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-3.1