Repository Implementation from : https://github.com/ardalis/CleanArchitecture/blob/master/src/CleanArchitecture.Infrastructure/Data/EfRepository.cs

EFRepository.cs

 public class EfRepository<T> : IRepository<T> where T : BaseEntity
    {
        private readonly AppDbContext _dbContext;

        public EfRepository(AppDbContext dbContext)
        {
            _dbContext = dbContext;
        }

        public T GetById(int id)
        {
            return _dbContext.Set<T>().SingleOrDefault(e => e.Id == id);
        }

        public List<T> List()
        {
            return _dbContext.Set<T>().ToList();
        }

        public T Add(T entity)
        {
            _dbContext.Set<T>().Add(entity);
            _dbContext.SaveChanges();

            return entity;
        }

        public void Delete(T entity)
        {
            _dbContext.Set<T>().Remove(entity);
            _dbContext.SaveChanges();
        }

        public void Update(T entity)
        {
            _dbContext.Entry(entity).State = EntityState.Modified;
            _dbContext.SaveChanges();
        }
    }