Question

Found the issue…I had MergeOption.NoTracking set on my context.entity…sigh

Not sure what I’m doing wrong.

The object cannot be deleted because it was not found in the ObjectStateManager.

        var deleteOrders = db.TABLE.Where(x => x.WCCR_ID == WccrId && x.ADAM == null).ToList();
        foreach (var item in deleteOrders)
        {

            db.TABLE.DeleteObject(item);
        }
        db.SaveChanges();

I tried attaching the item db.Attach(item), but that throws an error ‘Object with the same Key already exists’.

thanks for your help. cheers

Answer 1

Your code looks good. Try using:

var deleteOrders = db.TABLE.Where(x => x.WCCR_ID == WccrId && x.ADAM == null)
                           .ToList();
        foreach (var item in deleteOrders)
        {
            db.Entry(item).State = System.Data.EntityState.Deleted;            
        }
        db.SaveChanges();

UPDATE

EF 4.0 uses the ObjectContext class.

using(YourContext ctx = new YourContext())
{
   ctx.ObjectStateManager.ChangeObjectState(entity, System.Data.EntityState.Deleted);
}

EF 4.1 uses the DbContext class in which the methods like Set<T> and Entry are defined.

using(YourContext ctx = new YourContext())
{
   ctx.Entry(entity).State = System.Data.EntityState.Deleted;
}

UPDATE 2

The NuGet package only includes the EF 4.1 runtime and does not include the Visual Studio item templates for using DbContext with Model First and Database First development.

Download: http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=26825