EF core entity update

Question

User-457790453 posted

Is this a valid update method in repo pattern within EF core to update attached entities.

public virtual void Update(TEntity obj)
{
           DbSet.Update(obj);
            var attachedObj = DbSet.Local.FirstOrDefault(e => e.Id.Equals(obj.Id));
            if (attachedObj != null)
            {
                var attachedEntry = DbContext.Entry(attachedObj);
                attachedEntry.CurrentValues.SetValues(obj);
            }
            else
                DbSet.Update(obj);
         }

Answer 1

User1120430333 posted

Why, is it not working or something?

Answer 2

User-832373396 posted

Hi Fouad,

Sir, for your code, I recommend that you could refer to this complete  Repository Pattern example in the .net core

namespace GR.Data 
{ 
    public class Repository<T> : IRepository<T> where T : BaseEntity 
    { 
        private readonly ApplicationContext context; 
        private DbSet<T> entities; 
        string errorMessage = string.Empty; 
 
        public Repository(ApplicationContext context) 
        { 
            this.context = context; 
            entities = context.Set<T>(); 
        } 
        public IEnumerable<T> GetAll() 
        { 
            return entities.AsEnumerable(); 
        } 
 
        public T Get(long id) 
        { 
            return entities.SingleOrDefault(s => s.Id == id); 
        } 
        public void Insert(T entity) 
        { 
            if (entity == null) 
            { 
                throw new ArgumentNullException("entity"); 
            } 
            entities.Add(entity); 
            context.SaveChanges(); 
        } 
 
        public void Update(T entity) 
        { 
            if (entity == null) 
            { 
                throw new ArgumentNullException("entity"); 
            } 
            context.SaveChanges(); 
        } 
 
        public void Delete(T entity) 
        { 
            if (entity == null) 
            { 
                throw new ArgumentNullException("entity"); 
            } 
            entities.Remove(entity); 
            context.SaveChanges(); 
        } 
 
    } 
} 

• From https://code.msdn.microsoft.com/Generic-Repository-Pattern-f133bca4/sourcecode?fileId=164016&pathId=902500354 

2 and you could download it and run it on your local :)

With regards, Angelina Jolie