Queries.cs

using System;
using Example.Repositories;
using GraphQL.Types;
using Microsoft.Extensions.DependencyInjection;

namespace Example.GraphQL;

public interface IQueryFieldsProvider
{
    void AddQueryFields(ObjectGraphType objectGraph);
}

public interface IDogQuery : IQueryFieldsProvider { }

public interface ICatQuery : IQueryFieldsProvider { }

public class DogQuery : IDogQuery
{
    private readonly IServiceProvider _serviceProvider;

    public DogQuery(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    public void AddQueryFields(ObjectGraphType objectGraph)
    {
        objectGraph.Field<StringGraphType>("say", resolve: context => "woof woof woof");

        objectGraph.Field<NonNullGraphType<ListGraphType<NonNullGraphType<DogType>>>>("dogBreeds", resolve: context =>
        {
            using var scope = _serviceProvider.CreateScope();
            var dogRepository = scope.ServiceProvider.GetRequiredService<DogRepository>();
            var dogs = dogRepository.GetDogs();
            return dogs;
        });
    }
}

public class DogImageDetailsQuery : IDogQuery
{
    private readonly IServiceProvider _serviceProvider;

    public DogImageDetailsQuery(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    public void AddQueryFields(ObjectGraphType objectGraph)
    {
        objectGraph.FieldAsync<NonNullGraphType<ImageDetailsType>>("dogImageDetails", resolve: async context =>
        {
            using var scope = _serviceProvider.CreateScope();
            var imageDetailsRepository = scope.ServiceProvider.GetRequiredService<DogImageDetailsRepository>();
            var imageDetails = await imageDetailsRepository.GetDogImageDetailsAsync();
            return imageDetails;
        });
    }
}

public class CatQuery : ICatQuery
{
    private readonly IServiceProvider _serviceProvider;

    public CatQuery(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    public void AddQueryFields(ObjectGraphType objectGraph)
    {
        objectGraph.Field<StringGraphType>("say", resolve: context => "meow meow meow");

        objectGraph.Field<NonNullGraphType<ListGraphType<NonNullGraphType<CatType>>>>("catBreeds", resolve: context =>
        {
            using var scope = _serviceProvider.CreateScope();
            var catRepository = scope.ServiceProvider.GetRequiredService<CatRepository>();
            var cats = catRepository.GetCats();
            return cats;
        });
    }
}