Why EF code first update method does not work?

Question

I have this method :

public void Update(DBS.BankAccount entity) { try { using (var _nahidContext = new NahidContext()) { _nahidContext.BankAccounts.Attach(entity); var bankAccountElement = _nahidContext.Entry(entity); bankAccountElement.CurrentValues.SetValues(entity); _nahidContext.SaveChanges(); //__________ or ___________ //var bankAccountElement = FindById(entity.Id); //if (_nahidContext.Entry(bankAccountElement).State == System.Data.Entity.EntityState.Detached) //{ // _nahidContext.BankAccounts.Attach(bankAccountElement); //} ////_nahidContext.Entry(bankAccountElement).State = System.Data.Entity.EntityState.Modified; //_nahidContext.SaveChanges(); } } catch (Exception ex) { throw new ArgumentException(ex.Message); } }

Which run without any error but my bankAccountElement does not change. Please help me.

tede24 · Accepted Answer · 2016-02-04 12:35:41Z

First you attach (entity state= unchanged), then you set values with same values than attached entity, so it keeps unchanged.

You should do this

 _nahidContext.BankAccounts.Attach(entity); var bankAccountElement = _nahidContext.Entry(entity); bankAccountElement.State = EntityState.Modified;

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