Question
I have to be able to set the primary key of the entities I am trying to add in my list "final_zones". I have a controller constructor as follows:
public UtilController(CFETSContext context)
{
_context = context;
}
......Then in a web api method.........
using (var transaction = _context.Database.BeginTransaction())
{
_context.Database.ExecuteSqlCommand(@"SET IDENTITY_INSERT [CFETSWeb].[dbo].[Zone] ON");
_context.SaveChanges();
transaction.Commit();
}
using (var transaction = _context.Database.BeginTransaction())
{
_context.Zones.AddRange(final_zones);
_context.SaveChanges(); //ERROR HERE
transaction.Commit();
}
No matter what I do, I cannot seem to get IDENTITY_INSERT to turn on. I get the following error:
{"Cannot insert explicit value for identity column in table 'Zone' when IDENTITY_INSERT is set to OFF."}
I just can't seem to get it to turn off. I can add entities to my DB in the controller, so I know everything else is working. I have tried doing this without a transaction as well with the same result.
_context.Database.ExecuteSqlCommand(@"SET IDENTITY_INSERT [CFETSWeb].[dbo].[Zone] ON");
_context.Zones.AddRange(final_zones);
_context.SaveChanges();
Any ideas? I am at a loss for what to try next. Thanks.
Popular Answer
I solved it with the following:
using (var dbContextTransaction = _context.Database.BeginTransaction())
{
try
{
_context.Database.ExecuteSqlCommand(@"SET IDENTITY_INSERT [CFETSWeb].[dbo].[Zone] ON");
_context.Zones.AddRange(final_zones);
_context.SaveChanges();
dbContextTransaction.Commit();
}
catch (Exception e)
{
dbContextTransaction.Rollback();
}
}
NOTE: You HAVE to do this per table. IDENTITY_INSERT can only be set for 1 table at a time it seems, so you can do it this way or toggle it to OFF in the same transaction.
Also, IDENTITY_INSERT has to be in a transaction, as it only stays on for the duration of a transaction.
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