Custom Data Provider setup through Dependency Injection

Hi, I’m trying to resolve an issue I currently have with my solution. I’m trying to combine WebApi and EntityFramework extensions.

Namely, I’m trying to insert my DbContext object into the CustomDataProvider I have. Now, I’ve already tried the solutions told in the issue #194 , but none of them worked.

Here’s what my constructor needs in my CustomDataProvider class:

public CustomDataProvider(IMapper mapper, ApplicationDbContext context, EntityFrameworkDataProvider efDataProvider)
{
    EFDataProvider = efDataProvider;
    Context = context;
    Mapper = mapper;
}

And here’s the current problem I’m facing (in Startup.cs):

public void Configure(...)
{
      EntityFrameworkDataProvider efdp = new EntityFrameworkDataProvider(...);

      Audit.Core.Configuration.DataProvider = new CustomDataProvider(serviceProvider.GetRequiredService<IMapper>(),
                      serviceProvider.GetRequiredService<ApplicationDbContext>(), efdp);
}

P.S. I need the DbContext instance inside the CustomDataProvider so I could insert custom data models into my database.

[vukasinpetrovic]

This is what worked finally, using DataProviderFactory and getting dbContext/services via contextAccessor.HttpContext.RequestService method. Is that good approach or should I do it another way because it requests service on every webapi method call?

[thepirat000]

I think that’s the right approach. Requesting services on each action is fine. Also instantiating DbContext is cheap.

But you could use the service provider to request the CustomDataProvider and the dependencies will get injected on the constructor, like:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>();
    services.AddSingleton<IMapper, Mapper>();
    services.AddSingleton<CustomDataProvider>();
    services.AddSingleton<EntityFrameworkDataProvider>(new EntityFrameworkDataProvider(...))
    // ...
}

public void Configure(IServiceProvider serviceProvider)
{
    Audit.Core.Configuration.DataProviderFactory = () => serviceProvider.GetRequiredService<CustomDataProvider>();
}