NullReferenceException

Hi

I need your help because I just cannot figure out what is wrong.

I executed the following code:

using (CirtsDomainUnitOfWork unitOfWork = new CirtsDomainUnitOfWork()) { var testReturnCollection = unitOfWork.Carers.Select(x => x).First();

... }

and I get a NullReferenceException with the following stack trace:

at Mindscape.LightSpeed.Model.TypeModel.(LightSpeedContext , Boolean ) at ..(TypeModel , Query , IList ) at ..(UnitOfWorkBase , TypeModel , Query , IList ) at ..(Query , TypeModel , IList ) at ..(Query , IList ) at Mindscape.LightSpeed.UnitOfWork.Find(Query query, IList results) at Mindscape.LightSpeed.UnitOfWorkBase.Find(Query query) at Mindscape.LightSpeed.Linq.Plan.SingleQueryPlan.ExecuteImmediate(IUnitOfWork unitOfWork, Type returnType) at Mindscape.LightSpeed.Linq.LinqQueryProvider.System.Linq.IQueryProvider.Execute[S](Expression expression) at System.Linq.Queryable.First[TSource](IQueryable`1 source) at Lwb.Cirts.Server.Services.AtAGlance.Repositories.AtAGlanceRepository.GetPlacementRecordsByClient(Guid clientId, DateTime startDate, DateTime endDate) in D:\Dev\Clients\LWB\Life Without Barriers - CIRTS\Trunk\Cirts\src\Cirts\Server\Lwb.Cirts.Server.Services\AtAGlance\Repositories\AtAGlanceRepository.cs:line 20 at Lwb.Cirts.Server.Services.AtAGlance.AtAGlanceService.GetPlacementRecordsByClient(Guid clientId, DateTime startDate, DateTime endDate) in D:\Dev\Clients\LWB\Life Without Barriers - CIRTS\Trunk\Cirts\src\Cirts\Server\Lwb.Cirts.Server.Services\AtAGlance\AtAGlanceService.svc.cs:line 131 at SyncInvokeGetPlacementRecordsByClient(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)

Any ideas or am I just being stupid?

JB

You need to create the UnitOfWork by using a LightSpeedContext, you cannot "new one up" as you are doing above.

e.g. Assuming your context configuration is named "Development" then you would call:

using (var unitOfWork = new LightSpeedContext<CirtsDomainUnitOfWork>("Development").CreateUnitOfWork())
{
  ...
}

Im actually a bit surprised you get a NullReferenceException though rather than a LightSpeedException. We have a few checks for the context being null at entry points for queries so I would have expected you to hit that.

Jeremy

Hi Mate

Thanks for that. I will create the unit of work as above. I am pretty new to using Lightspeed, so that explains my mistake. :-)

YOUR SUPPORT ROCK!!

Over and Out gssst.

JB