Unable to resolve service for type 'Api.Repositories.UnitOfWork' while attempting to activate 'Api.ServicesBusiness.EquipoServices' - repository-pattern

Question

I want to make a webapi and I'm trying to do it through the services way, I have a repository generic and another 2 repository and a unit of work, apparently everything goes fine, but when I run and test the webapi from postman I got that error:
InvalidOperationException: Unable to resolve service for type 'Api.Repository.Repositories.UnitOfWork' while attempting to activate 'Api.ServicesBusiness.Implementacion.EquipoServices'.
Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateArgumentCallSites(Type serviceType, Type implementationType, CallSiteChain callSiteChain, ParameterInfo[] parameters, bool throwIfCallSiteNotFound)
Here is the my dbcontect:
public class AppDbContext : DbContext
{
public AppDbContext()
{
}
public AppDbContext(DbContextOptions<AppDbContext> option) :base(option)
{
}
public DbSet<Equipo> Equipos { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
if (!optionsBuilder.IsConfigured)
{
optionsBuilder.UseSqlServer("Server=(localdb)\\Express;Database=SoftballLeague;Trusted_Connection=True");
}
}
}
Here is the interface of my generic repository:
public interface IGenericRepository<T> where T : class
{
Task<T> AddAsyn(T t);
Task<T> UpdateAsyn(T t, object key);
}
Here is the implementation of my generic repository:
public class GenericRepository<T> : IGenericRepository<T> where T : class
{
private readonly AppDbContext _context;
private readonly DbSet<T> _dbSet;
public GenericRepository(AppDbContext context)
{
_context = context;
_dbSet = _context.Set<T>();
}
public virtual async Task<T> AddAsyn(T t)
{
_dbSet.Add(t);
await _context.SaveChangesAsync();
return t;
}
public virtual async Task<T> UpdateAsyn(T t, object key)
{
if (t == null)
return null;
T exist = await _dbSet.FindAsync(key);
if (exist != null)
{
_context.Entry(exist).CurrentValues.SetValues(t);
await _context.SaveChangesAsync();
}
return exist;
}
}
Here is the interface of my equipo repository:
public interface IEquipoRepository:IGenericRepository<Team>
{
int GetAverageTeam(string name);
int GetTeamHit(string name);
}
Here is the implementation of my equipo repository:
public class EquipoRepository : GenericRepository<Team>, IEquipoRepository
{
private readonly AppDbContext dbContext;
public EquipoRepository(AppDbContext context) : base(context)
{
this.dbContext = context;
}
public int GetAverageTeam(string name)
{
int teamAverage = 0;
var resultAverage = this.dbContext.Equipos
//.SelectMany(bItem => bItem.)
.Where(equipo=>equipo.Nombre==name)
.SelectMany(equipo => equipo.jugadores)
.Average(jugador => jugador.Average);
if (resultAverage.HasValue)
teamAverage =Convert.ToInt32(Math.Round(resultAverage.Value));
return teamAverage;
}
public int GetTeamHit(string name)
{
int resultTotal = 0;
var result = this.dbContext.Equipos
//.SelectMany(bItem => bItem.)
.Where(equipo => equipo.Nombre == name)
.SelectMany(equipo => equipo.jugadores)
.Sum(jugador => jugador.Cant_Hits_Conectados);
if (result.HasValue)
resultTotal = result.Value;
return resultTotal;
}
}
Here is the interface of my unit of work:
public interface IUnitOfWork:IDisposable
{
Task Commit();
}
Here is the implementation of my unit of work:
public class UnitOfWork : IUnitOfWork
{
private readonly AppDbContext _DbContext;
private EquipoRepository equipoRepository ;
public UnitOfWork(AppDbContext dbContext)
{
this._DbContext = dbContext;
this.equipoRepository = new EquipoRepository(this._DbContext);
}
public EquipoRepository GetEquipoRepository{
get {
if(this.equipoRepository==null)
this.equipoRepository= new EquipoRepository(this._DbContext);
return this.equipoRepository;
}
}
public async Task Commit()
{
await this._DbContext.SaveChangesAsync();
}
public void Dispose()
{
this._DbContext.Dispose();
}
}
Here is the implementation of services interfaces IEquipoServices:
public interface IEquipoServices
{
ICollection<EstadisticaEquipoModel>AveragePorEquipo(string name);
int Total2bleConectados(string name);
}
Here is the implementation of services EquipoServices which is the one who throws the error:
public class EquipoServices : IEquipoServices
{
private readonly UnitOfWork unit;
public EquipoServices(UnitOfWork unitOfWorkFactory)
{
this.unit = unitOfWorkFactory;
}
public ICollection<EstadisticaEquipoModel> AveragePorEquipo(string name)
{
var equipoAverage= this.unit.GetEquipoRepository.GetAverageEquipo(name);
return equipoAverage;
}
public int AveragePorEquipo(string name)
{
var result = this.unit.GetEquipoRepository.GetEquipoTotal2bleConectados(name);
return result;
}
}
This is the controller, here I am just running the ListadoEquipos() method:
[Route("api/[controller]")]
public class EquipoController : ControllerBase
{
private readonly IEquipoServices equipoService;
private readonly IMapper _mapper;
public EquipoController(IEquipoServices eqService, IMapper mapper)
{
this.equipoService = eqService;
this._mapper = mapper;
}
[HttpGet("list")]
public IEnumerable<string> ListadoEquipos()
{
return new string[] { "value1", "value2" };
}
}
This is the configuration in the startup.cs file:
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<AppDbContext>(options=>options.UseSqlServer(Configuration.GetConnectionString("ConnectionString")));
services.AddTransient<IUnitOfWork, UnitOfWork>();
services.AddScoped(typeof(IGenericRepository<>), typeof(GenericRepository<>));
services.AddSingleton<IEquipoServices, EquipoServices>();
//services.AddScoped<IJu, JugadorService>();
services.AddAutoMapper(typeof(Startup));
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
}

Answer 1

You registered IUnitOfWork, but you're injecting UnitOfWork. The service collection doesn't know how to inject UnitOfWork directly.
Long and short, inject IUnitOfWork instead:
private readonly IUnitOfWork unit;
public EquipoServices(IUnitOfWork unitOfWorkFactory)