Lintosql convert to entity framework dbcontext errors

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VB

entity-framework

exceptions

Hi got a project that used LinqToSQL for database access and is now being converted to Entity Framework Core. Most conversions are ok but have come across this one that I am having trouble with...what happens if you have a db conflict on save. The existing code is:

Catch cex As ChangeConflictException
                        Dim sb As StringBuilder = New StringBuilder
                        For Each o As ObjectChangeConflict In ldb.ChangeConflicts
                            Dim metatable As Mapping.MetaTable = ldb.Mapping.GetTable(o.Object.GetType())
                            sb.AppendFormat("Table name: {0}", metatable.TableName)
                            sb.AppendLine()
                            For Each col As MemberChangeConflict In o.MemberConflicts
                                sb.AppendFormat("Column name : {0}", col.Member.Name)
                                sb.AppendLine()
                                sb.AppendFormat("Original value : {0}", col.OriginalValue.ToString())
                                sb.AppendLine()
                                sb.AppendFormat("Current value : {0}", col.CurrentValue.ToString())
                                sb.AppendLine()
                                sb.AppendFormat("Database value : {0}", col.DatabaseValue.ToString())
                                sb.AppendLine()
                                sb.AppendLine()
                            Next
                            o.Resolve(RefreshMode.KeepChanges)
                            errorOccurredFlag = True
                        Next

the errors are coming up on :
ldb.ChangeConflicts and
ldb.Mapping
which don't exist in the EF dbContext.

Is this still the correct way to record the errors?

What I have tried:

looking up Mapping & changeconflicts in entity framework core but all references apply to system.data.linq