Inject generic interface in .NET Core

Question

I want to inject this interface to my controllers:

public interface IDatabaseService<T>
{
    IEnumerable<T> GetList();
    ...
}

I want to use generic, because in my WebApi project i have controllers like ProjectController, TaskController etc and i want to use generic interface to each of type (for example, IDatabaseService<Project>, IdatabaseService<Task> etc).

Class, that will be injected to controller will look like this:

public class ProjectService : IDatabaseService<Project>
{
    private readonly DbContext context;

    public ProjectService(DbContext context)
    {
        this.context = context;
    }

    public IEnumerable<Project> GetList() { }
    ...
}

But when I try to ineject in my Startup.cs:

services.AddScoped<IDatabaseService<T>>();

I need to pass T type.

My question is, how to make injection generic and how inject it properly in controller? For example:

public class ProjectController : ControllerBase
{
    private readonly ProjectService projectService;

    public ProjectController (IDatabaseService<Project> projectService)
    {
        this.projectService = projectService;
    }
}

If it will work? And is it good practice to make generic interface to inject into controllers? If no, how to do it better?

Answer 1

You can do this by adding the below line in Startup.cs

// best practice  
services.AddTransient(typeof(IDatabaseService<>),typeof(DatabaseService<>));

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