BulkSaveChanges throws NullReferenceException, but SaveChanges works

[asfarley]

Hi,

I've just tested out your library as a replacement for the dbcontext.SaveChanges function, but I'm getting an exception:

   at EFCore.BulkExtensions.DbContextBulkTransactionSaveChanges.<>c.<SaveChangesAsync>b__2_3(IEntityType e)
   at EFCore.BulkExtensions.DbContextBulkTransactionSaveChanges.<>c__DisplayClass2_0.<SaveChangesAsync>b__6(<>f__AnonymousType1`4 g)
   at Medallion.Collections.TopologicalSorter.<TopologicalSort>d__0`1.MoveNext()
   at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)
   at System.Collections.Generic.List`1.AddRange(IEnumerable`1 collection)
   at System.Linq.Enumerable.ConcatIterator`1.ToList()
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at EFCore.BulkExtensions.DbContextBulkTransactionSaveChanges.<SaveChangesAsync>d__2.MoveNext()
   at EFCore.BulkExtensions.DbContextBulkTransactionSaveChanges.SaveChanges(DbContext context, BulkConfig bulkConfig, Action`1 progress)
   at EFCore.BulkExtensions.DbContextBulkTransaction.Execute[T](DbContext context, Type type, IEnumerable`1 entities, OperationType operationType, BulkConfig bulkConfig, Action`1 progress)
   at EFCore.BulkExtensions.DbContextBulkExtensions.BulkSaveChanges(DbContext context, BulkConfig bulkConfig, Action`1 progress)
   at VSControls.VSDatabaseManager.SaveProjectToDb(Project Proj, String path) in C:\VitalSim\Vital-Sim-.NET\VSControls\VSDatabaseManager.cs:line 353

My understanding from the documentation is that the function dbcontext.BulkSaveChanges should be a drop-in replacement for dbcontext.SaveChanges. Do you have any suggestions for troubleshooting steps?

[killnine]

Exact same issue here. I was evaluating to see if we could speed up bulk-inserts in some utilities with this library but it seemed to fall on its face with this.

SaveChanges works fine but using this throws an Object Ref exception

FWIW - I am running .NET 8.0, so perhaps it's an issue with newer .NET release?

[asfarley]

My application is targeting .NET 6.0

[borisdj]

Can you make a sample where the issue would be reproducible, code snipped of Entities their Db context config and Insert method. Or to write a test, take a look at existing one for BulkSaveChanges in the project.