dbContext.<Entity>.Update() is creating new records

When i do something like:

var e = new Entity();
e.Id = 100;
e.Name = "Name 100";
dbContext.Entities.Update(e);
dbContext.SaveChanges();

a new record is created.

Is this the correct behaviour?

[rowanmiller]

@DiegoZoracKy just to be clear, it only inserts a row if the key is set to zero. If it is set to anything else then it will correctly update it.

i.e. this code

var e = new TestUpdate();
e.Name = "Name 100";
e.Id = 5;
dbContext.TestUpdates.Update(e);
dbContext.SaveChanges();

Produces this SQL

exec sp_executesql N'SET NOCOUNT OFF;
UPDATE [TestUpdate] SET [Name] = @p1
WHERE [Id] = @p0;
SELECT @@ROWCOUNT;
',N'@p0 int,@p1 nvarchar(4000)',@p0=5,@p1=N'Name 100'

Not saying that it’s not a bug… but just that you’ll only see the insert behavior if you are attempting to update an entity with a key set to zero.

[rowanmiller]

Re-opening as we still need this to track the issue where the entity being passed to Update is marked as added if it has no key value assigned.