ASP.NET Web Api и Autofac IoC. Ошибка: ExceptionMessage = Ни один из найденных конструкторов

Question

Я пытаюсь использовать Autofac для IoC для моего проекта Asp.Net WebApi. Я пытаюсь отправить простой запрос POST в API, но безрезультатно. Я застрял на этом некоторое время и не могу понять.

См. Соответствующий код и сообщите соответствующим образом. Ваша помощь будет принята с благодарностью.

public interface IEntityRepository<T> where T : class, new() 
{ 
    IQueryable<T> All { get; } 
    IQueryable<T> AllIncluding(params Expression<Func<T,object>>[] includeProperties); 
    IQueryable<T> GetAll(); 
    //IQueryable<T> GetSingle(string entitiesID); 
    IQueryable<T> FindBy(Expression<Func<T, bool>> predicate); 
    void Add(T entity); 
    void Delete(T entity); 
    void Edit(T entity); 
    void Save(); 

    PaginatedList<T> Paginate<TKey>(int pageindex, int pagesize, Expression<Func<T, TKey>> keySelector); 

    PaginatedList<T> Paginate<TKey>(
     int pageindex, int pagesize, 
     Expression<Func<T, TKey>> keySelector, 
     Expression<Func<T, bool>> predicate, 
     params Expression<Func<T, object>>[] includeProperties); 
} 

public class EntityRepository<T> : IEntityRepository<T> where T : class, new() 
{ 
    readonly CirclesDBEntities _entitiesContext; 

    public EntityRepository(CirclesDBEntities entitiesContext) 
    { 
     if (entitiesContext == null) 
     { 
      throw new ArgumentNullException("entitiesContext"); 
     } 
     _entitiesContext = entitiesContext; 
    } 

    public virtual IQueryable<T> GetAll() 
    { 
     return _entitiesContext.Set<T>(); 
    } 

    public IQueryable<T> All 
    { 
     get { return GetAll(); } 
    } 

    public virtual IQueryable<T> AllIncluding(params Expression<Func<T, object>>[] includeProperties) 
    { 
     IQueryable<T> query = _entitiesContext.Set<T>(); 
     foreach (var includeProperty in includeProperties) 
     { 
      query = query.Include(includeProperty); 
     } 
     return query; 
    } 

    public virtual IQueryable<T> FindBy(Expression<Func<T, bool>> predicate) 
    { 
     return _entitiesContext.Set<T>().Where(predicate); 
    } 

    public virtual PaginatedList<T> Paginate<TKey>(int pageIndex, int pageSize, Expression<Func<T, TKey>> keySelector) 
    { 
     return Paginate(pageIndex, pageSize, keySelector, null); 
    } 
    public virtual PaginatedList<T> Paginate<TKey>(
     int pageIndex, int pageSize, 
     Expression<Func<T, TKey>> keySelector, 
     Expression<Func<T, bool>> predicate, 
     params Expression<Func<T, object>>[] includeProperties) 
    { 
     IQueryable<T> query = AllIncluding(includeProperties).OrderBy(keySelector); 
     query = (predicate == null) ? query : query.Where(predicate); 

     return query.ToPaginatedList(pageIndex, pageSize); 
    } 

    public virtual void Add(T entity) 
    { 
     DbEntityEntry dbEntityEntry = _entitiesContext.Entry<T>(entity); 
     _entitiesContext.Set<T>().Add(entity); 
    } 

    public virtual void Edit(T entity) 
    { 
     DbEntityEntry dbEntityEntry = _entitiesContext.Entry<T>(entity); 
     dbEntityEntry.State = EntityState.Modified; 
    } 

    public virtual void Delete(T entity) 
    { 
     DbEntityEntry dbEntityEntry = _entitiesContext.Entry<T>(entity); 
     dbEntityEntry.State = EntityState.Deleted; 
    } 

    public virtual void Save() 
    { 
     _entitiesContext.SaveChanges(); 
    } 
} 

public static class TermRepository 
{ 
    public static Term GetCurrentTerm(this IEntityRepository<Term> termRepository) 
    { 
     return termRepository.GetAll().OrderByDescending(x => x.DateUploaded).FirstOrDefault(); //descending puts the most recent item on top of the stack 
    } 
} 

public class TermsService : ITermsService 
{ 
    private readonly IEntityRepository<Term> _termRepository; 

    public TermsService(IEntityRepository<Term> termRepository) 
    { 
     _termRepository = termRepository; 
    } 

    public Term GetMostRecentTerm() 
    { 
     Term term = _termRepository.GetCurrentTerm(); 
     return term; 
    } 

    public bool UploadNewTerm(string newTerm) 
    { 
     Term term = new Term(); 
     term.TermID = SetAccountID(); 
     term.Term1 = newTerm; 
     term.DateUploaded = DateTime.Now; 

     _termRepository.Add(term); 
     _termRepository.Save(); 

     return true; 
    } 

} 

public interface ITermsService 
{ 
    Term GetMostRecentTerm(); 
    bool UploadNewTerm(string Term); 
} 

public static class AutofacConfig 
{ 
    public static void Initialize(HttpConfiguration config) 
    { 
     Initialize(config, 
     RegisterServices(new ContainerBuilder())); 
    } 
    public static void Initialize(HttpConfiguration config, IContainer container) 
    { 
     config.DependencyResolver = new AutofacWebApiDependencyResolver(container); 
    } 
    private static IContainer RegisterServices(ContainerBuilder builder) 
    { 
     builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); 


     // registration goes here 


     //EF DbContext 
     builder.RegisterType<CirclesDBEntities>() 
      .As<DbContext>() 
      .InstancePerRequest(); 

     //Repositories       
     builder.RegisterGeneric(typeof(EntityRepository<>)) 
      .As(typeof(IEntityRepository<>)) 
      .InstancePerDependency(); 

     //this makes it check non-public classes 
     //builder.RegisterGeneric(typeof(EntityRepository<>)) 
      //.As(typeof(IEntityRepository<>)) 
      //.InstancePerRequest().FindConstructorsWith(
       //new DefaultConstructorFinder(type => 
        //type.GetConstructors(BindingFlags.NonPublic | BindingFlags.Instance))) 
      //.As(typeof(IEntityRepository<>)); 


     //Services 
     builder.RegisterType<TermsService>() 
      .As<ITermsService>() 
      .InstancePerRequest(); 


     return builder.Build(); 
    } 
} 

public class WebApiApplication : System.Web.HttpApplication 
{ 
    protected void Application_Start() 
    { 
     //Registering routes from the WebApi.Config file 
     GlobalConfiguration.Configure(Config.WebApiConfig.Register); 

     //Registering routes from the HelpPageAreaRegistration in the areas section 
     GlobalConfiguration.Configure(CirclesWebApi.Areas.HelpPage.HelpPageAreaRegistration.RegisterAllAreas); 


     GlobalConfiguration.Configure(Config.AutofacConfig.Initialize); 


    } 
} 

public class TermsController : ApiController 
{ 
    public readonly ITermsService _termService; 

    public TermsController(ITermsService termService) 
    { 
     _termService = termService; 
    } 

    [HttpPost] 
    public HttpResponseMessage PostTerms() 
    { 
     string terms = "terms this is a new term inserted through fiddler"; 

     if(terms != null) 
     { 
      bool created = _termService.UploadNewTerm(terms); 

      if (created) 
      { 
       var response = Request.CreateResponse(HttpStatusCode.Created); 
       return response; 
      } 
      else 
       return Request.CreateResponse(HttpStatusCode.InternalServerError); 
     } 
     else 
     { 
      return Request.CreateResponse(HttpStatusCode.BadRequest); 
     } 
    } 
} 

Ошибка:

ExceptionMessage=None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' 

Answer 1

В конструкторе EntityRepository<T> вы инъекционные CirclesDBEntities, но зарегистрировать его как DbContext. Таким образом, вы можете исправить это, введя конструктор, указав DbContext, изменив свою регистрацию, удалив .As<DbContext>() часть вашей регистрации или добавив .AsSelf() к вашей регистрации.