CODEWITHSUNDEEP
c#entity-frameworkupdates
Keivan
Keivan

Reputation: 173

Why EF code first update method does not work?

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.

Upvotes: 0

Views: 39

Answers (1)

tede24
tede24

Reputation: 2354

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;

You can read more here

Upvotes: 2

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