System.NullReferenceException: Object reference not set to an instance of an object

[ericbrunner]

System.NullReferenceException: Object reference not set to an instance of an object

[dadhi]

@ericbrunner Hi here,

Yes, the separated example/test is very much appreciated.
It is hard to say about the reason without more details,
and it is a shame that .NET still does not have an option to expose the Null reference target.

Meanwhile I would suggest to try out the DryIoc v6.0.0-preview-07.
There are many fixes and changes that may solved the problem already.

[ericbrunner]

@ericbrunner Hi here,

Yes, the separated example/test is very much appreciated. It is hard to say about the reason without more details, and it is a shame that .NET still does not have an option to expose the Null reference target.

Meanwhile I would suggest to try out the DryIoc v6.0.0-preview-07. There are many fixes and changes that may solved the problem already.

thank you very much for your kind reply @dadhi :-) We will try the DryIoc v6.0.0-preview-07 and I try to create a Reproduction Sample.

[ericbrunner]

Hi @dadhi I tried to mimic our situation in a test: https://github.com/ericbrunner/DryIoCResolverExploration/blob/6dc9478bd20c22a6cb22dfebd0f3a3991da8ddf5/DryIoCResolverExploration/TestProject/UnitTest1.cs#L41

Sadly, I could not reproduce the exception I get at line: https://github.com/ericbrunner/DryIoCResolverExploration/blob/6dc9478bd20c22a6cb22dfebd0f3a3991da8ddf5/DryIoCResolverExploration/DashboardConnectors.Library/Connectors/Base/ApplianceModelDashboardConnector.cs#L26

Full Project is here: https://github.com/ericbrunner/DryIoCResolverExploration/tree/main

I'll try some further tests to reproduce our situation but I allready informed the colleague to update to what you suggested.

[ericbrunner]

@ericbrunner Hi here,

Yes, the separated example/test is very much appreciated. It is hard to say about the reason without more details, and it is a shame that .NET still does not have an option to expose the Null reference target.

Meanwhile I would suggest to try out the DryIoc v6.0.0-preview-07. There are many fixes and changes that may solved the problem already.

Colleague of mine tested with suggested version v6.0.0-preview-07 and now gets a different exception:

System.MissingMethodException: Could not find InternalPreserveStackTrace
at DryIoc.ReflectionTools.TryRethrowWithPreservedStackTrace(Exception ex) in /Users/warborg/.nuget/packages/dryioc/6.0.0-preview-07/contentFiles/cs/netstandard2.0/DryIoc/Container.cs:line 15728
at DryIoc.Interpreter.TryInterpretAndUnwrapContainerException(IResolverContext r, Expression expr, Object& result) in /Users/warborg/.nuget/packages/dryioc/6.0.0-preview-07/contentFiles/cs/netstandard2.0/DryIoc/Container.cs:line 3265
at DryIoc.Container.ResolveAndCache(Int32 serviceTypeHash, Type serviceType, IfUnresolved ifUnresolved) in /Users/warborg/.nuget/packages/dryioc/6.0.0-preview-07/contentFiles/cs/netstandard2.0/DryIoc/Container.cs:line 417
at DryIoc.Container.Resolve(Type serviceType, IfUnresolved ifUnresolved) in /Users/warborg/.nuget/packages/dryioc/6.0.0-preview-07/contentFiles/cs/netstandard2.0/DryIoc/Container.cs:line 369
at Miele.Libraries.Foundation.Modules.DependencyInjection.Implementation.DryIocContainer.ResolveOvenDashboardItem in /Users/warborg/Projects/01 Miele/Foundation Library/src/Modules/DependencyInjection/Implementation/DryIocContainer.cs:line 17
at Miele.Modules.Domestic.Public.Dashboard.DashboardConnector.ApplianceModelDashboardConnector`2[[Miele.Modules.Oven.ApplianceCommunication.Contract.ApplianceModelInterfaces.IOvenDashboardItemModel, Miele.Modules.Oven.ApplianceCommunication.Contract, Version=9.0.10.0, Culture=neutral, PublicKeyToken=null],[Miele.Modules.Oven.UI.Dashboard.OvenDashboardItem, Miele.Modules.Oven.UI, Version=9.0.10.0, Culture=neutral, PublicKeyToken=null]].CreateDashboardItem(MetaAppliance metaAppliance) in /Users/warborg/Projects/01 Miele/Foundation Library/Sandbox.Modules/src/Domestic.Public/Dashboard/DashboardConnector/ApplianceModelDashboardConnector.cs:line 58

for some reason it's using the netstandard2.0 version and probably trying to use something from .net8

[dadhi]

Nice. Thanks for the testing. I will fix it and return back with the new version to try.