blazorCourse/myBlazorApp/myBlazorApp/Pages/Index.razor.cs

using System;
using Microsoft.AspNetCore.Components;
using myBlazorApp.Components;
using myBlazorApp.Models;
using myBlazorApp.Services;

namespace myBlazorApp.Pages
{
    public partial class Index
    {
        [Inject]
        public IDataService DataService { get; set; }

        public List<Item> Items { get; set; } = new List<Item>();

        private List<CraftingRecipe> Recipes { get; set; } = new List<CraftingRecipe>();

        protected override async Task OnAfterRenderAsync(bool firstRender)
        {
            base.OnAfterRenderAsync(firstRender);

            if (!firstRender)
            {
                return;
            }

            Items = await DataService.List(0, await DataService.Count());
            Recipes = await DataService.GetRecipes();

            StateHasChanged();
        }
    }
}