I'm getting this error when starting my Asp .Net Core Mvc web app:
"Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Vepo.Application.IAddVeganItemToAppUseCase Lifetime: Transient ImplementationType: Vepo.Application.AddVeganItemToAppUseCase': Unable to resolve service for type 'Vepo.Data.GroceryItemGroceryStoresRepository' while attempting to activate 'Vepo.Application.AddVeganItemToAppUseCase'.)"
So it appears that this part is the offender:
Unable to resolve service for type 'Vepo.Data.GroceryItemGroceryStoresRepository'.
In my Startup.cs I have this:
services.AddScoped(typeof(IGroceryItemGroceryStoresRepository), typeof(GroceryItemGroceryStoresRepository)); services.AddTransient<IAddVeganItemToAppUseCase, AddVeganItemToAppUseCase>(); Is something wrong with that?
Here is all code concerned:
IRepository.cs
using System.Collections.Generic; using System.Threading.Tasks; using Microsoft.AspNetCore.Mvc; namespace Vepo.Data { public interface IRepository<EntityType, IdType> { Task<EntityType> Save(EntityType entity); EntityType Fetch(IdType id); IEnumerable<EntityType> FetchAll(); bool EntityExists(IdType id); } } ARepository.cs
using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Mvc; using Microsoft.EntityFrameworkCore; using Vepo.Common.Utilities; using Vepo.DataContext; using Vepo.Domain; namespace Vepo.Data { [Serializable] public abstract class ARepository<EntityType, IdType> : IRepository<EntityType, IdType> where EntityType : ADomainEntity<IdType> { protected readonly VepoContext context; protected DbSet<EntityType> entities; protected string errorMessage = string.Empty; public ARepository(VepoContext context) { this.context = context; entities = context.Set<EntityType>(); } public bool Compare<T>(T x, T y) { return EqualityComparer<T>.Default.Equals(x, y); } public virtual async Task<EntityType> Save(EntityType entity) { if (entity == null) { throw new ArgumentNullException("entity"); } if (NumberUtilities.IsNumber(entity.Id)) { if (Convert.ToInt32(entity.Id) > 0) { await context.SaveChangesAsync(); } else { await entities.AddAsync(entity); await context.SaveChangesAsync(); } } return entity; } public EntityType Fetch(IdType id) { return entities.SingleOrDefault(s => Compare<IdType>(s.Id, id)); } public IEnumerable<EntityType> FetchAll() { return entities.AsEnumerable(); } public void Delete(EntityType entity) { if (entity == null) { throw new ArgumentNullException("entity"); } entities.Remove(entity); context.SaveChanges(); } public void Remove(EntityType entity) { if (entity == null) { throw new ArgumentNullException("entity"); } entities.Remove(entity); } public void SaveChanges() { context.SaveChanges(); } public virtual bool EntityExists(IdType id) { return entities.Any(e => Compare<IdType>(e.Id, id)); } } } IGroceryItemGroceryStoresRepository.cs:
using Vepo.Domain; namespace Vepo.Data { public interface IGroceryItemGroceryStoresRepository : IRepository<GroceryItemGroceryStore, int> { } } GroceryItemGroceryStoresRepository.cs
using System; using Microsoft.EntityFrameworkCore; using Vepo.DataContext; using Vepo.Domain; using System.Linq; using System.Threading.Tasks; namespace Vepo.Data { public class GroceryItemGroceryStoresRepository : ARepository<GroceryItemGroceryStore, int>, IGroceryItemGroceryStoresRepository { public GroceryItemGroceryStoresRepository(VepoContext context) : base(context) { } public override bool EntityExists(int id) { return context.GroceryItemGroceryStores.Any(e => e.VeganItemId == id); } public async override Task<GroceryItemGroceryStore> Save(GroceryItemGroceryStore entity) { ++entity.VeganItem.CurrentRevisionId; var toReturnVeganItem = entity.VeganItem; var toReturnEstablishment = entity.Establishment; context.GroceryItems.Add(entity.VeganItem); context.SaveChanges(); context.Set<GroceryStore>().AddIfNotExists(entity.Establishment , x => x.PlaceId == entity.Establishment.PlaceId); context.SaveChanges(); var establishmentId = context.GroceryStores.Single(a => a.PlaceId == entity.Establishment.PlaceId).Id; var veganItemId = context.GroceryItems.Single(a => a.Brand == entity.VeganItem.Brand && a.Name == entity.VeganItem.Name).Id; toReturnEstablishment.Id = establishmentId; toReturnVeganItem.Id = veganItemId; entity.VeganItemId = veganItemId; entity.EstablishmentId = establishmentId; entity.VeganItem = null; entity.Establishment = null; context.Set<GroceryItemGroceryStore>().AddIfNotExists(entity , x => x.VeganItemId == veganItemId && x.EstablishmentId == establishmentId); try { await context.SaveChangesAsync(); } catch (DbUpdateException) { if (EntityExists(entity.VeganItemId)) { throw; } else { throw; } } entity.VeganItem = toReturnVeganItem; entity.Establishment = toReturnEstablishment; return entity; } } } IAddVeganItemToAppUseCase.cs
using System.Threading.Tasks; using Vepo.Domain; namespace Vepo.Application { public interface IAddVeganItemToAppUseCase { Task<GroceryItemGroceryStore> Invoke(GroceryItemGroceryStore entity); } } AddVeganItemToAppUseCase.cs
using System.Threading.Tasks; using Vepo.Data; using Vepo.Domain; namespace Vepo.Application { public class AddVeganItemToAppUseCase : IAddVeganItemToAppUseCase { private GroceryItemGroceryStoresRepository repository; public AddVeganItemToAppUseCase(GroceryItemGroceryStoresRepository repository) { this.repository = repository; } public Task<GroceryItemGroceryStore> Invoke(GroceryItemGroceryStore entity) { return repository.Save(entity); } } } Startup.cs
using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Hosting; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using Microsoft.EntityFrameworkCore; using System.Text.Json.Serialization; using Vepo.Domain; using Vepo.DataContext; using System; using Vepo.Data; using Vepo.Application; namespace Vepo.Web { public class Startup { public Startup(IConfiguration configuration) { Configuration = configuration; } public IConfiguration Configuration { get; } public void ConfigureServices(IServiceCollection services) { services .AddDbContext<VepoContext>(opt => opt .UseNpgsql( Configuration .GetConnectionString("DefaultConnection")) .EnableSensitiveDataLogging() .EnableDetailedErrors() .LogTo(Console.WriteLine)); services.AddControllers().AddJsonOptions(opt => { opt.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter()); }); services.AddControllers().AddNewtonsoftJson(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore); services.AddMvc().AddJsonOptions(options => { options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.Preserve; }); services.AddScoped(typeof(IGroceryItemGroceryStoresRepository), typeof(GroceryItemGroceryStoresRepository)); services.AddTransient<IAddVeganItemToAppUseCase, AddVeganItemToAppUseCase>(); services.AddSwaggerGen(); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } app.UseHttpsRedirection(); app.UseRouting(); app.UseAuthorization(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); app.UseSwagger(); app.UseSwaggerUI(c => { c.SwaggerEndpoint("/swagger/v1/swagger.json", "My Test1 Api v1"); }); } } } 
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