ASP.NET

MVC_part2

Do not Repeat Yourself（DRY）  -> 善用「泛型」的特性

 

1.create IRepository

2.Inheritance IRespository , then remove inside code

3.create GenericRespository

namespace MVCProject.Models.Repository
{
    public class GenericRepository<TEntity> : IRepository<TEntity>
        where TEntity : class
    {
        public void Create(TEntity instance)
        {
            throw new NotImplementedException();
        }

        public void Update(TEntity instance)
        {
            throw new NotImplementedException();
        }

        public void Delete(TEntity instance)
        {
            throw new NotImplementedException();
        }

        public TEntity Get( int primaryID)
        {
            throw new NotImplementedException();
        }

        public IQueryable<TEntity> GetAll()
        {
            throw new NotImplementedException();
        }

        public void SaveChanges()
        {
            throw new NotImplementedException();
        }

        public void Dispose()
        {
            throw new NotImplementedException();
        }
    }
}

4. fix  IRepository -> because their function Get are different class 

5. instance GenericRepository  ,then delete ICompanyRepository and CompanyReposity

 private DbContext _context { get; set; }

        public GenericRepository()
        {
            this._context = new HoEntities();
        }

        public GenericRepository(DbContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            this._context = context;
        }

        public GenericRepository(ObjectContext context)
        {
            if (context==null)
            {
                throw new ArgumentNullException("context");
            }
            this._context = new DbContext(context, true);
        }

 public void Create(TEntity instance)
        {
            if (instance ==null)
            {
                throw new ArgumentNullException("instance");
            }
            else
            {
                this._context.Set<TEntity>().Add(instance);
                this.SaveChanges();
            }
        }

public void Update(TEntity instance)
        {
            if (instance==null)
            {
                throw new ArgumentNullException("instance");
            }
            else
            {
                this._context.Entry(instance).State = EntityState.Modified;
                this.SaveChanges();
            }
        }

 public void Delete(TEntity instance)
        {
            if (instance == null)
            {
                throw new ArgumentNullException("instance");
            }
            else
            {
                this._context.Entry(instance).State = EntityState.Deleted;
                this.SaveChanges();
            }
        }

 public TEntity Get(Expression<Func<TEntity,bool>> predicate)
        {
            return this._context.Set<TEntity>().FirstOrDefault(predicate);

        }

        public IQueryable<TEntity> GetAll()
        {
            return this._context.Set<TEntity>().AsQueryable();
        }

        public void SaveChanges()
        {
            this._context.SaveChanges();
        }

 protected virtual void Dispose(bool Disposing)
        {
            if (Disposing)
            {
                if (this._context != null)
                {
                    this._context.Dispose();
                    this._context = null;
                }
            }
        }

        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }

6.fix controller

參考網址: mrkt