c#asp.net-core constructor entity-framework-core

Is there any better way to add the dbcontext to a Asp.core MVC controller?

In the new MVC Core it seems the standard way to get the context to the controller is by doing this

public class BaseController : Controller
{
    public readonly ReportDBContext _db;
    
    public BaseController(ReportDBContext db)
    {
        _db = db;
    }
}

I can then use

public class HomeController : BaseController
{   
    public HomeController(ReportDBContext db) : base(db) { }
}

To make this a little easier in all other controllers. Normally in Asp.net MVC I can get a context any time by using new ReportDBContext()

Is there a similar way of this now, or do I have to have the context in all controllers in asp.core MVC?

Solution

Thanks to @mm8's answer, if you decided to use dependency injection, then you can follow the below mentioned steps.

Suppose that you have defined your ReportDBContext like this:

public class ReportDBContext : DbContext
{
    public DbSet<Sample> Samples { get; set; }
    //...

    public ReportDBContext(DbContextOptions<ReportDBContext> options) : base(options) 
    { 
      //...
    }
}

So you need to config your startup.cs like this:

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        //...What needed
        services.AddDbContext<ReportDBContext>(options => options.UseSqlServer("Connection string to your DB"));
        //...What needed
    }
    //...
 }

So you can easily inject your ReportDBContext to your classes like this(for example inject it to one of your controllers):

[Route("api/[controller]")]
public class ValuesController : Controller
{
    private readonly ReportDBContext _dbContext;

    public ValuesController(ReportDBContext dbContext )
    {
        _dbContext = dbContext;
    }
    //...
}

You can simply inject the ReportDBContext to your BaseController instead of injecting it to every controller in your project too.

Update 1

If you do not want to inject the ReportDBContext into each constructor, then you can design your BaseController as follow by using HttpContext.RequestServices:

public class BaseController : Controller
{
    protected ReportDBContext DbContext => (ReportDBContext)HttpContext.RequestServices.GetService(typeof(ReportDBContext));
    //...
}

[Route("api/[controller]")]
public class ValuesController : BaseController
{
    //...

    [HttpGet]
    public List<Sample> Get() => DbContext.Samples.ToList();
}