The instance of entity type cannot be tracked because another instance with the same key value for {‘Id’} is already being tracked

[kevin]

#324

Postcount 47

Hi All,

I want update a object with Entity Framework Core. I did with steps as below:

1. Find object from database with Id
2. Use Microsoft.EntityFrameworkCore.EntityState.Modified state to update

I just get errors message: The instance of entity type cannot be tracked because another instance with the same key value for {‘Id’} is already being tracked

Anybody can help me?

[kevin]

#326

Postcount 47

You can use AsNoTracking() in Microsoft.EntityFrameworkCore to clear track object before update. You can see sample code below:

[HttpPost]
[Route(“edit/{id}”)]
public IActionResult Edit(int id, Account account)
{
if (account.Password == null)
{
account.Password = db.Account.AsNoTracking().SingleOrDefault(a => a.Id == id).Password;
}
else
{
account.Password = BCrypt.Net.BCrypt.HashPassword(account.Password);
}
db.Entry(account).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
db.SaveChanges();
return RedirectToAction(“index”, “account”);
}

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