how to use scoped dependency in a singleton in C# / ASP

Question

I\'m new to C#/ASP coming from a Java world. I\'ve read this article: https://docs.asp.net/en/latest/fundamentals/dependency-injection.html#service-lifetimes-and-registratio

Answer 1

ok, found it:

public class Provider<T> : IProvider<T> {
    IHttpContextAccessor contextAccessor;
    public Provider(IHttpContextAccessor contextAccessor) {
        this.contextAccessor = contextAccessor;
    }
    T IProvider<T>.Get() {
        return contextAccessor.HttpContext.RequestServices.GetService<T>();
    }
}

and in Startup:

    public void ConfigureServices(IServiceCollection services) {
        services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
        services.AddSingleton<ISingletonService, SingletonService>();
        services.AddScoped<IScopedService, ScopedService>();
        services.AddTransient<IProvider<IScopedService>, Provider<IScopedService>>();
        // other bindings
    }

:)

see https://github.com/aspnet/Hosting/issues/793 for more details about using and registering HttpContextAccessor