Question

In trying to setup a unit test for inserting an item into an SQL Server Express (2008) database using C# Linq I’ve encountered an error that is causing me some trouble. The Linq code is built using Visual Studio 2008.

The exception is thrown on a system running Windows XP SP2. The Linq works fine and the record is inserted appropriately on a system running Windows 7 Home Premium (64-bit).

I’ve dropped and re-created the database on the XP system. I’ve dropped and re-created the DAL and corresponding DBML on the XP system.

Other tables with unit tests for inserts to the same database work just fine.

Inserting a record into the table using a simple insert statement in SQL Server Management Studio works appropriately.

What should I look at to find the source of the problem? What should be done to resolve the problem?

Any insight as to what the error message is really trying to say would be greatly appreciated.

Error Message

System.IndexOutOfRangeException : Index was outside the bounds of the array.

Stack Trace

at 

System.Data.Linq.IdentityManager.StandardIdentityManager.MultiKeyManager`3.TryCreateKeyFromValues(Object[] values, MultiKey`2& k)
at System.Data.Linq.IdentityManager.StandardIdentityManager.IdentityCache`2.Find(Object[] keyValues)
at System.Data.Linq.IdentityManager.StandardIdentityManager.Find(MetaType type, Object[] keyValues)
at System.Data.Linq.CommonDataServices.GetCachedObject(MetaType type, Object[] keyValues)
at System.Data.Linq.ChangeProcessor.GetOtherItem(MetaAssociation assoc, Object instance)
at System.Data.Linq.ChangeProcessor.BuildEdgeMaps()
at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges()
at nUnit.DAL.FacilityTests.AddFacility2() in C:\SVN\SVNRevenue360\Branches\Dev\Code\ProviderAdvantage\nUnit.CoreTests\Tests\DAL\FacilityTests.cs:line 50

Insert Code

        [Test]
    public void AddFacility2() {
        string facilityname = "Test Facility";
        try {
            using (PA.Database.Revenue360DB db = new PA.Database.Revenue360DB(PA.DAL.DataAccess.ConnectionString)) {
                db.Log = Console.Out;
                PA.Database.Facility facility = new PA.Database.Facility();
                facility.id = Guid.NewGuid();
                facility.Name = facilityname;
                facility.Street1 = "";
                facility.Street2 = "";
                facility.Street3 = "";
                facility.City = "";
                facility.State = "";
                facility.Zip = "";
                facility.Description = "";

                db.Facilities.InsertOnSubmit(facility);
                db.SubmitChanges();  // line 50
            }
        } catch (Exception ex) {
            Console.WriteLine(ex.GetType().FullName + ":  " + ex.Message);
            Console.WriteLine(ex.InnerException == null ? 
                "No inner exception" :
                ex.InnerException.GetType().FullName + ":  " + ex.InnerException.Message);
            throw;
        }
    }

I’ve looked at the following SO questions without insight as to what is causing this particular issue.

https://stackoverflow.com/questions/1087172/why-am-i-getting-index-was-outside-the-bounds-of-the-array
IndexOutOfRangeException on Queryable.Single
Strange LINQ Exception (Index out of bounds)

Answer 1

Take a look at this link.

Here are a few excerpts:

A common cause of this error is
associations pointing in the wrong
direction. (Something that is
extremely easy to do if editing the
model by hand, partly because the
association arrow pointer is in the
opposite end of where it would appear
in an ER diagram)

and

I was having the same problem and it
was due to the fact my primary key was
two columns instead of the traditional
one. (both guids). When I added a
third column that was the sole primary
key column, it worked.

UPDATE: Did some more poking around and found this SO post. Looks like it might have something to do with your DBML…