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#AT Repository and Unit of Work Pattern - 5


UnitOfWork Layer creation

Add a folder in CMBusinessTyre project Named UnitOfWorkLayer
add 2 Interface and 2 class files.


IMyUnitOfWork
IGenericRepository
MyUnitOfWork
GenericRepository
public interface IMyUnitOfWork
   {
        int Commit();
   }
-------------------------------------------------
public interface IGenericRepository<T>
    {
        IEnumerable<T> GetData();
        T GetByID(object id);
         T Insert(T entity);
        void Delete(object id);
        void Update(T entityToUpdate);
        IEnumerable<T> FindBy(Expression<Func<T, bool>> predicate);
   
    }
-------------------------------------------------
public class MyUnitOfWork : IMyUnitOfWork, IDisposable
    {
        private GenericRepository<LoginUser> _loginUser;
        private GenericRepository<LogRegister> _logRegister;
        private GenericRepository<ContactInfo> _contactInfo;
        private GenericRepository<ContactAddress> _addressInfo;

        ContactManagerContext context = new ContactManagerContext();
   
        public GenericRepository<LoginUser> LoginUser
        {
            get
            {
                if (this._loginUser == null)
                    this._loginUser = new GenericRepository<LoginUser>(context);
                return _loginUser;
            }
        }
        public GenericRepository<LogRegister> LogRegister
        {
            get
            {
                if (this._logRegister == null)
                    this._logRegister = new GenericRepository<LogRegister>(context);
                return _logRegister;
            }
        }
        public GenericRepository<ContactInfo> ContactInfo
        {
            get
            {
                if (this._contactInfo == null)
                    this._contactInfo = new GenericRepository<ContactInfo>(context);
                return _contactInfo;
            }
        }
        public GenericRepository<ContactAddress> ContactAddress
        {
            get
            {
                if (this._addressInfo == null)
                    this._addressInfo = new GenericRepository<ContactAddress>(context);
                return _addressInfo;
            }
        }
        public int Commit()
        {
            try
            {
                return context.SaveChanges();
            }
            catch (DbEntityValidationException ex)
            {
                // Retrieve the error messages as a list of strings.
                var errorMessages = ex.EntityValidationErrors
                        .SelectMany(x => x.ValidationErrors)
                        .Select(x => x.ErrorMessage);

                // Join the list to a single string.
                var fullErrorMessage = string.Join("; ", errorMessages);

                // Combine the original exception message with the new one.
                var exceptionMessage = string.Concat(ex.Message, " The validation errors are: ", fullErrorMessage);

                // Throw a new DbEntityValidationException with the improved exception message.
                throw new DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors);
            }
        }

        private bool disposed = false;
        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    context.Dispose();
                }
            }
            this.disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
    }
------------------------------------------------------------------
 public class GenericRepository<T> : IGenericRepository<T> where T : class
    {
        internal ContactManagerContext context;
        internal DbSet<T> dbSet;
        public GenericRepository(ContactManagerContext context)
        {
            this.context = context;
            this.dbSet = context.Set<T>();
        }
        public IEnumerable<T> GetData()
        {
            return dbSet.ToList();
        }
        public T GetByID(object id)
        {
            return dbSet.Find(id);
        }
        public IEnumerable<T> FindBy(Expression<Func<T, bool>> predicate)
        {
            IEnumerable<T> query = dbSet.Where(predicate).AsEnumerable();
            return query;
        }
        public T Insert(T entity)
        {
           return dbSet.Add(entity);
        }
        public void Delete(object id)
        {
            T entityToDelete = dbSet.Find(id);
            Delete(entityToDelete);
        }
        //public virtual T Delete(T entityToDelete)
        //{
        //    if (context.Entry(entityToDelete).State == EntityState.Detached)
        //    {
        //        dbSet.Attach(entityToDelete);
        //    }
        //    dbSet.Remove(entityToDelete);
        //}

        public void Update(T entityToUpdate)
        {
            dbSet.Attach(entityToUpdate);
            context.Entry(entityToUpdate).State = EntityState.Modified;
        }
    }
------------------------------------------------------------

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