public static void rinuncioAlleModifiche(Object entita, LumenEntities dbContext)
{
ObjectContext objContext = ((IObjectContextAdapter)dbContext).ObjectContext;
if (dbContext.Entry(entita).State == EntityState.Modified)
{
objContext.Refresh(RefreshMode.StoreWins, entita);
}
if (dbContext.Entry(entita).State == EntityState.Added)
{
dbContext.Set(entita.GetType()).Remove(entita);
}
}
public void simulaUiStaccando2()
{
Carrello carrello;
ObjectStateEntry stato;
using (LumenEntities dbContext = new LumenEntities()) {
ObjectContext objContext = ((IObjectContextAdapter)dbContext).ObjectContext;
carrello = dbContext.Carrelli.FirstOrDefault(c => c.venduto == false);
bool trovato = objContext.ObjectStateManager.TryGetObjectStateEntry(carrello, out stato);
Assert.IsTrue(trovato);
Assert.AreEqual(stato.State, EntityState.Unchanged);
}
using (LumenEntities dbContext = new LumenEntities()) {
ObjectContext objContext = ((IObjectContextAdapter)dbContext).ObjectContext;
bool isDetached = dbContext.Entry(carrello).State == EntityState.Detached;
Assert.IsTrue(isDetached);
// Modifico l'oggetto da staccato
Random rnd = new Random();
int randomNumber = rnd.Next(0, 9);
carrello.note = carrello.note + randomNumber.ToString();
}
using (LumenEntities dbContext = new LumenEntities()) {
ObjectContext objContext = ((IObjectContextAdapter)dbContext).ObjectContext;
bool isDetached = dbContext.Entry(carrello).State == EntityState.Detached;
Assert.IsTrue(isDetached);
var poldo = dbContext.Carrelli.Attach(carrello);
isDetached = dbContext.Entry(carrello).State == EntityState.Detached;
Assert.IsFalse(isDetached);
// Qui non ci devono essere modifiche, perché prima ho modificato l'oggetto quando era staccato.
int quanti = dbContext.SaveChanges();
Assert.IsTrue(quanti == 0);
}
// -- Ora provo a modificare l'oggetto da attaccato.
using (LumenEntities dbContext = new LumenEntities()) {
ObjectContext objContext = ((IObjectContextAdapter)dbContext).ObjectContext;
bool isDetached = dbContext.Entry(carrello).State == EntityState.Detached;
Assert.IsTrue(isDetached);
var poldo = dbContext.Carrelli.Attach(carrello);
isDetached = dbContext.Entry(carrello).State == EntityState.Detached;
Assert.IsFalse(isDetached);
// Modifico l'oggetto da attaccato
Random rnd = new Random();
int randomNumber = rnd.Next(0, 9);
carrello.note = carrello.note + randomNumber.ToString();
var tt = dbContext.Entry(carrello);
Assert.AreEqual(tt.State, EntityState.Modified);
}
using (LumenEntities dbContext = new LumenEntities()) {
ObjectContext objContext = ((IObjectContextAdapter)dbContext).ObjectContext;
// Provo a salvare l'oggetto staccato e mi deve dare errore.
int quantiQ = dbContext.SaveChanges();
Assert.IsTrue(quantiQ == 0);
// Ora forzo lo stato della entità a modificato
var poldo = dbContext.Carrelli.Attach(carrello);
var test2 = dbContext.Entry(carrello);
Assert.AreEqual(test2.State, EntityState.Unchanged);
objContext.DetectChanges();
var test3 = dbContext.Entry(carrello);
Assert.AreEqual(test3.State, EntityState.Unchanged);
test3.State = EntityState.Modified;
int quanti = dbContext.SaveChanges();
Assert.IsTrue(quanti > 0);
}
}
