GraphQL-DotNet–Use an async resolver

I’m spending a lot (read: “waaay to many”) time learning GraphQL. One of the things I had to figure out was how to call an async method inside a field resolver.

You have 2 options:

• Option 1 -  Use the Field<> method and return a Task:

	public interface IProductService
	{
	Task<IList<Product>> GetProducts();
	}

view raw IProductService.cs hosted with ❤ by GitHub

	public class ProductsQuery: ObjectGraphType<object>
	{
	private readonly IProductService _productService;
	public ProductssQuery(IProductService productService)
	{
	_productService = productService;
	Name = "Query";
	Field<ListGraphType<ProductType>>(
	"products",
	resolve: context => _productService.GetProducts()
	);
	}
	}

view raw ProductsQuery.cs hosted with ❤ by GitHub

• Option 2 – Use the FieldAsync<> method and await the result:

	public interface IProductService
	{
	Task<IList<Product>> GetProducts();
	}

view raw IProductService.cs hosted with ❤ by GitHub

	public class ProductsQuery: ObjectGraphType<object>
	{
	private readonly IProductService _productService;
	public ProductssQuery(IProductService productService)
	{
	_productService = productService;
	Name = "Query";
	FieldAsync<ListGraphType<ProductType>>(
	"products",
	resolve: async(context) => await _productService.GetProducts()
	);
	}
	}

view raw ProductsQuery.cs hosted with ❤ by GitHub