Query.cs

using System;
using System.Collections.Generic;
using GraphQLApi.Domain.Products;

public class Query
{
 private readonly ProductsRepository _productsRepository;

 public Query(ProductsRepository productsRepository)
 {
 _productsRepository = productsRepository;
 }

 public IEnumerable<Product> GetProducts() => _productsRepository.Get();

 public Product GetProduct(Guid id) => _productsRepository.GetById(id);
}