asp.net core custom IRouter Dependency Injection - asp.net-core

Question

I'm creating a custom routing in asp.net core 2, where I check the path in a DB and update action and controller to the desired one.
I have this custom IRouter defined like this
public interface IRouteCustom : IRouter
{
}
public class RouteCustom : IRouteCustom
{
private readonly IRouter _innerRouter;
private readonly IMemoryCache _memoryCache;
private readonly IUnitOfWork _unitOfWork;
public RouteCustom(IRouter innerRouter, IMemoryCache memoryCache, IUnitOfWork unitOfWork)
{
_innerRouter = innerRouter ?? throw new ArgumentNullException(nameof(innerRouter));
_memoryCache = memoryCache;
_unitOfWork = unitOfWork;
}
public async Task RouteAsync(RouteContext context)
{
I check the routes in the DB using the _unitOfWork
}
public VirtualPathData GetVirtualPath(VirtualPathContext context)
{
Also I do the same here...
}
}
I have no problem with those functions and I'm able to select controller and action.
My problem is how to access the database, since I can't inject the IUnitOfWork dependency into de custom router.
I'm getting this error message:
'Cannot resolve 'IUnitOfWork' from root provider because it requires scoped service 'DbContext'.'
I have my ConfigureServices like this
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<DbContext>(options => options.UseMySQL(configuration.GetConnectionString("DefaultClient")));
services.AddIdentity<Domain.EntitiesClient.Entities.ApplicationUser, Domain.EntitiesClient.Entities.ApplicationRole>().AddEntityFrameworkStores<DbContext>().AddDefaultTokenProviders();
services.AddScoped<IDbContext, DbContext>();
services.AddTransient<IUnitOfWork, UnitOfWork>();
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddMemoryCache();
services.AddMvc();
/*route custom*/
var supportedCultures = new[] { new CultureInfo("en-US"), new CultureInfo("es-ES"), new CultureInfo("it-IT") };
var optionsCulture = new RequestLocalizationOptions { DefaultRequestCulture = new RequestCulture("en-US", "en-US"), SupportedCultures = supportedCultures, SupportedUICultures = supportedCultures };
optionsCulture.RequestCultureProviders = new IRequestCultureProvider[] { new RouteDataRequestCultureProvider() { RouteDataStringKey = "culture", Options = optionsCulture } };
services.AddSingleton(optionsCulture);
}
And the Configure
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseBrowserLink();
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();
app.UseAuthentication();
app.UseMvc(routes =>
{
routes.Routes.Add(new RouteCustom(routes.DefaultHandler
, routes.ServiceProvider.GetRequiredService<IMemoryCache>()
, app.ApplicationServices.GetService<IUnitOfWork>()
));
routes.MapRoute(name: "areas", template: "{area:exists}/{controller=Home}/{action=Index}/{id?}");
routes.MapRoute(name: "default", template: "{controller=Home}/{action=Index}/{id?}");
});
}
The problem is here
app.ApplicationServices.GetService<IUnitOfWork>()
I need to inject the IUnitOfWork in order to check the database, but I don't know how to do it. In other Middlewares I could inject the IUnitOfWork directly in the function, but in this case I can't do it in the
public async Task RouteAsync(RouteContext context)
How can I achieve this? I'm sure I'm doing something wrong here, but I have been reading a lot of articles and can't figure out the way.
Thanks.
UPDATE: POSSIBLE SOLUTION
The only solution I can think is remove the injection into the IRouter and get the service "manually" inside the RouteAsync method.
public async Task RouteAsync(RouteContext context)
{
var unitOfWork = context.HttpContext.RequestServices.GetRequiredService<IUnitOfWork>()
var routes = unitOfWork.Router.GetAll();
...
}
This way we have access to the database and it works good.
Is it a good approach?