C#•2y ago

❔ Simple Api Fails to launch, why?

My Code:

uilder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddScoped<IRecordService, RecordService>();
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("defaultConnection")));

var app = builder.Build();

uilder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddScoped<IRecordService, RecordService>();
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("defaultConnection")));

var app = builder.Build();

My Error:

    System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Services.Interfaces.IRecordService Lifetime: Scoped ImplementationType: Services.Services.RecordService': Unable to resolve service for type 'Core.Interfaces.IRecordRepository' while attempting to activate 'Services.Services.RecordService'.)'

    System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Services.Interfaces.IRecordService Lifetime: Scoped ImplementationType: Services.Services.RecordService': Unable to resolve service for type 'Core.Interfaces.IRecordRepository' while attempting to activate 'Services.Services.RecordService'.)'

How do i fix this? whats the prblem?

46 Replies

BananaPie•2y ago

did you bind "IRecordRepository"? Unable to resolve service for type 'Core.Interfaces.IRecordRepository' while attempting to activate 'Services.Services.RecordService'

Angius•2y ago

Yeah, RecordService has RecordRepository as a dependency, but the latter is nowhere in the DI

antimatter8189•2y ago

hmm, can u elaborate?

Angius•2y ago

Your record service needs a record repository But has nowhere to take it from Everything you want injectable you need to register first

antimatter8189•2y ago

how would u go about fixing it?

Angius•2y ago

antimatter8189•2y ago

how do i make it take it from somwehre builder.Services.AddScoped<IRecordRepository, RecordRepository>(); ?

Angius•2y ago

Yep For example

antimatter8189•2y ago

so this:

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(); builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("defaultConnection")));
builder.Services.AddScoped<IRecordRepository, RecordRepository>();
builder.Services.AddScoped<IRecordService, RecordService>();

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(); builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("defaultConnection")));
builder.Services.AddScoped<IRecordRepository, RecordRepository>();
builder.Services.AddScoped<IRecordService, RecordService>();

gives the same error why? wth is going on

Angius•2y ago

Show your RecordService ig

antimatter8189•2y ago

public class RecordService : IRecordService
    {
        private readonly IRecordRepository _recordRepository;
        private readonly IUnitOfWork _unitOfWork;

        public RecordService(IRecordRepository recordRepository, IUnitOfWork unitOfWork)
        {
            _recordRepository = recordRepository;
            _unitOfWork = unitOfWork;
        }

        public async Task<Record> AddRecordAsync(Record record)
        {
            try
            {
                await _recordRepository.AddAsync(record);
                await _unitOfWork.SaveAsync();
                return record;
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<Record> UpdateRecordAsync(Record record)
        {
            try
            {
                await  _recordRepository.UpdateAsync(record);
                await _unitOfWork.SaveAsync();
                return record;
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<bool> DeleteRecordAsync(Guid recordId)
        {
            try
            {
                var record = await _recordRepository.GetByIdAsync(recordId);
                if (record == null)
                {
                    return false;
                }
                await _recordRepository.DeleteAsync(record);
                await _unitOfWork.SaveAsync();
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        public Task<Record> GetRecordByIdAsync(Guid recordId)
        {
            return  _recordRepository.GetByIdAsync(recordId);
        }

        public Task<IEnumerable<Record>> GetAllRecordsAsync()
        {
            return _recordRepository.GetAllAsync();
        }
    }

public class RecordService : IRecordService
    {
        private readonly IRecordRepository _recordRepository;
        private readonly IUnitOfWork _unitOfWork;

        public RecordService(IRecordRepository recordRepository, IUnitOfWork unitOfWork)
        {
            _recordRepository = recordRepository;
            _unitOfWork = unitOfWork;
        }

        public async Task<Record> AddRecordAsync(Record record)
        {
            try
            {
                await _recordRepository.AddAsync(record);
                await _unitOfWork.SaveAsync();
                return record;
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<Record> UpdateRecordAsync(Record record)
        {
            try
            {
                await  _recordRepository.UpdateAsync(record);
                await _unitOfWork.SaveAsync();
                return record;
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<bool> DeleteRecordAsync(Guid recordId)
        {
            try
            {
                var record = await _recordRepository.GetByIdAsync(recordId);
                if (record == null)
                {
                    return false;
                }
                await _recordRepository.DeleteAsync(record);
                await _unitOfWork.SaveAsync();
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        public Task<Record> GetRecordByIdAsync(Guid recordId)
        {
            return  _recordRepository.GetByIdAsync(recordId);
        }

        public Task<IEnumerable<Record>> GetAllRecordsAsync()
        {
            return _recordRepository.GetAllAsync();
        }
    }

Angius•2y ago

Huh, the code being very enterprise-y aside, it should work

antimatter8189•2y ago

However it doesnt 😄 so,, im dead in the water? 😄

Angius•2y ago

Uh, show your RecordRepository too...?

antimatter8189•2y ago

using Core.Interfaces;
using Core.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace Infrastructure.Repositories
{
    public class RecordRepository : GenericRepository<Record>, IRecordRepository
    {
        public RecordRepository(ApplicationDbContext context) : base(context)
        {
        }
        
    }
}

using Core.Interfaces;
using Core.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace Infrastructure.Repositories
{
    public class RecordRepository : GenericRepository<Record>, IRecordRepository
    {
        public RecordRepository(ApplicationDbContext context) : base(context)
        {
        }
        
    }
}

using Core.Interfaces;
using Core.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Infrastructure.Repositories
{
    public class GenericRepository<T> : IRepository<T> where T : class
    {
        private readonly ApplicationDbContext _context;
        private DbSet<T> _entities;

        public GenericRepository(ApplicationDbContext context)     
        {
            _context = context;
            _entities = context.Set<T>();
        }

        public async Task<T> GetByIdAsync(Guid id) => await _entities.FindAsync(id);

        public async Task<T> AddAsync(T entity)
        {
            await _entities.AddAsync(entity);
            await _context.SaveChangesAsync();
            return entity;
        }

        public async Task<IEnumerable<T>> GetAllAsync() 
        {
            var entityType = typeof(T);

            if (entityType.GetProperties().Any(p => p.Name == "IsDeleted"))
            {
                return await _entities.Where(e => !(bool)entityType.GetProperty("IsDeleted")
                .GetValue(e)).ToListAsync();
            }
            else
            {
                return await _entities.ToListAsync();
            }
        }

        public async Task<T> UpdateAsync(T entity)
        {
            _entities.Update(entity);
            await _context.SaveChangesAsync();
            return entity;
        }

        public async Task DeleteAsync(T entity)
        {
            _entities.Remove(entity);
            await _context.SaveChangesAsync();
        }

        public async Task SaveAsync()
        {
            await _context.SaveChangesAsync();
        }
    }
}

using Core.Interfaces;
using Core.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Infrastructure.Repositories
{
    public class GenericRepository<T> : IRepository<T> where T : class
    {
        private readonly ApplicationDbContext _context;
        private DbSet<T> _entities;

        public GenericRepository(ApplicationDbContext context)     
        {
            _context = context;
            _entities = context.Set<T>();
        }

        public async Task<T> GetByIdAsync(Guid id) => await _entities.FindAsync(id);

        public async Task<T> AddAsync(T entity)
        {
            await _entities.AddAsync(entity);
            await _context.SaveChangesAsync();
            return entity;
        }

        public async Task<IEnumerable<T>> GetAllAsync() 
        {
            var entityType = typeof(T);

            if (entityType.GetProperties().Any(p => p.Name == "IsDeleted"))
            {
                return await _entities.Where(e => !(bool)entityType.GetProperty("IsDeleted")
                .GetValue(e)).ToListAsync();
            }
            else
            {
                return await _entities.ToListAsync();
            }
        }

        public async Task<T> UpdateAsync(T entity)
        {
            _entities.Update(entity);
            await _context.SaveChangesAsync();
            return entity;
        }

        public async Task DeleteAsync(T entity)
        {
            _entities.Remove(entity);
            await _context.SaveChangesAsync();
        }

        public async Task SaveAsync()
        {
            await _context.SaveChangesAsync();
        }
    }
}

Angius•2y ago

Remove the ctor from your non-generic repo? It does nothing anyway

antimatter8189•2y ago

Yeah It does

Angius•2y ago

Not in the code you sent at least

antimatter8189•2y ago

Cs7036 it breaks the build that piece of code is on all the code examples i saw

Angius•2y ago

Ah, right, because it creates a default parameterless constructor...

antimatter8189•2y ago

still the problem lingers

Angius•2y ago

The problem is repositories over EF 😛

antimatter8189•2y ago

System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Services.Interfaces.IRecordService Lifetime: Scoped ImplementationType: Services.Services.RecordService': Unable to resolve service for type 'Core.Interfaces.IUnitOfWork' while attempting to activate 'Services.Services.RecordService'.)'

System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Services.Interfaces.IRecordService Lifetime: Scoped ImplementationType: Services.Services.RecordService': Unable to resolve service for type 'Core.Interfaces.IUnitOfWork' while attempting to activate 'Services.Services.RecordService'.)'

nah that aint correct

antimatter8189•2y ago

https://learn.microsoft.com/en-us/aspnet/mvc/overview/older-versions/getting-started-with-ef-5-using-mvc-4/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application

Implementing the Repository and Unit of Work Patterns in an ASP.NET...

The Contoso University sample web application demonstrates how users can create ASP.NET MVC 4 applications by using the Entity Framework 5 Code First and Visual Studio.

Angius•2y ago

You don't seem to have IUnitOfWork registered

antimatter8189•2y ago

ms offican l

Angius•2y ago

antimatter8189•2y ago

builder.Services.AddScoped<IUnitOfWork, UnitOfWork>(); CORRECT now

Angius•2y ago

DbContext is unit of work, DbSet<T> is a repository

antimatter8189•2y ago

tell me why?

MODiX•2y ago

Angius#1586

DbContext is unit of work, DbSet<T> is a repository

Quoted by

<@!85903769203642368> from #Simple Api Fails to launch, why? (click here)

React with ❌ to remove this embed.

antimatter8189•2y ago

explain to me why this line: builder.Services.AddScoped<IUnitOfWork, UnitOfWork>(); make this work? i dont get it

Angius•2y ago

Because you're injecting it

antimatter8189•2y ago

it made swagger paunch

Angius•2y ago

But from where?

antimatter8189•2y ago

launch

Angius•2y ago

As I said, anything you want injected, must be registered first You were injecting IUnitOFWork but it wasn't registered anywhere You told ASP "gimme the apple from the basket", but the basket had only carrots and motor oil

antimatter8189•2y ago

Does it have to be in this order for it to work?

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(); builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("defaultConnection")));
builder.Services.AddScoped<IUnitOfWork, UnitOfWork>();
builder.Services.AddScoped<IRecordService, RecordService>();
builder.Services.AddScoped<IRecordRepository, RecordRepository>();

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(); builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("defaultConnection")));
builder.Services.AddScoped<IUnitOfWork, UnitOfWork>();
builder.Services.AddScoped<IRecordService, RecordService>();
builder.Services.AddScoped<IRecordRepository, RecordRepository>();

does the order matter?

Angius•2y ago

Order doesn't matter, not in this case at least In some edge cases it might, but 99% of the time it doesn't

antimatter8189•2y ago

Gotcha so every stuff i inject anywhere must be registered first then it can be injected got u correct?

Angius•2y ago

Yep

antimatter8189•2y ago

kk thx u a life saver 😄 gn thank alot!

Angius•2y ago

Anytime 👌

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Simple Api Fails to launch, why?