efcore: {"Could not load type 'System.Diagnostics.CodeAnalysis.MaybeNullAttribute' from assembly 'netstandard, Version=2.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.":"System.Diagnostics.CodeAnalysis.MaybeNullAttribute"}

After getting today’s release of .net core 3.0. I have upgraded to EF core 3.0 library and we have started seeing this error

System.TypeLoadException: Could not load type 'System.Diagnostics.CodeAnalysis.MaybeNullAttribute' from assembly 'netstandard, Version=2.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.NonNullableConventionBase.IsNonNullableReferenceType(IConventionModelBuilder modelBuilder, MemberInfo memberInfo)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.NonNullableReferencePropertyConvention.Process(IConventionPropertyBuilder propertyBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.NonNullableReferencePropertyConvention.ProcessPropertyAdded(IConventionPropertyBuilder propertyBuilder, IConventionContext`1 context)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnPropertyAdded(IConventionPropertyBuilder propertyBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.RunVisitor.VisitOnPropertyAdded(OnPropertyAddedNode node)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.OnPropertyAddedNode.Accept(ConventionVisitor visitor)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionVisitor.Visit(ConventionNode node)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionVisitor.VisitConventionScope(ConventionScope node)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionBatch.Run()
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionBatch.Dispose()
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnModelInitialized(IConventionModelBuilder modelBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.OnModelInitialized(IConventionModelBuilder modelBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.Model..ctor(ConventionSet conventions)
   at Microsoft.EntityFrameworkCore.ModelBuilder..ctor(ConventionSet conventions)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel(DbContext context, IConventionSetBuilder conventionSetBuilder)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.<>c__DisplayClass5_0.<GetModel>b__1()
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.get_Value()
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, IConventionSetBuilder conventionSetBuilder)
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel()
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model()
   at Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServicesBuilder.<>c.<TryAddCoreServices>b__7_3(IServiceProvider p)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite singletonCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass1_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()
   at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
   at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()
   at Microsoft.EntityFrameworkCore.DbContext.get_Model()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.get_EntityType()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.CheckState()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.get_EntityQueryable()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.System.Linq.IQueryable.get_Provider()
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable`1 source, Expression expression, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable`1 source, LambdaExpression expression, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.SingleOrDefaultAsync[TSource](IQueryable`1 source, Expression`1 predicate, CancellationToken cancellationToken)
   at Microsoft.Education.AristoServices.ConnectorApp.Connectors.StateManagement.DbWorkflowExecutionStateManager.GetExecutionDetails(String executionId) in D:\code\AristoServices\src\ConnectorApp\Connectors\StateManagement\DbWorkflowExecutionStateManager.cs:line 35
   at Microsoft.Education.AristoServices.ConnectorApp.Connectors.StateManagement.DbWorkflowExecutionStateManager.UpdateExecutionStatusAsync(String executionId, WorkflowExecutionStatus executionStatus) in D:\code\AristoServices\src\ConnectorApp\Connectors\StateManagement\DbWorkflowExecutionStateManager.cs:line 92
   at Microsoft.Education.AristoServices.ConnectorApp.Web.Services.ConnectorWorkerQueueClient.SendMessageAsync(ConnectorWorkerMessage message) in D:\code\AristoServices\src\ConnectorApp\ConnectorApp.Web\Services\ConnectorWorkerQueueClient.cs:line 65
   at Microsoft.Education.AristoServices.ConnectorApp.Web.Services.ConnectorWorkerQueueClient.QueueWorkAsync[TRequestParameters](ConnectorWorkRequest`1 workRequest, String connectorType) in D:\code\AristoServices\src\ConnectorApp\ConnectorApp.Web\Services\ConnectorWorkerQueueClient.cs:line 46
   at Microsoft.Education.AristoServices.ConnectorApp.Web.Controllers.RequestController`1.QueueWork(ConnectorWorkRequest`1 payload) in D:\code\AristoServices\src\ConnectorApp\ConnectorApp.Web\Controllers\RequestController.cs:line 50
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at NSwag.AspNetCore.Middlewares.SwaggerUiIndexMiddleware.Invoke(HttpContext context)
   at NSwag.AspNetCore.Middlewares.RedirectToIndexMiddleware.Invoke(HttpContext context)
   at NSwag.AspNetCore.Middlewares.OpenApiDocumentMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 1
Comments: 21 (6 by maintainers)

Most upvoted comments

@AndriySvyryd You are mixing Xamarin.Android SDK with the Target Android SDK. You can have Xamarin.Android 10 and still target 9 or lower. And still, the issue occurs even with Xamarin.Android 10 and targeting Android Q.

@smitpatel I will report the Android and iOS issues on the corresponding projects.

mduchev on Oct 2, 2019

Same thing with Xamarin.Android. Is the netstandard.ddl, when using Android from the net core sdk or is it supplied by Xamarin.Android? If it is the latter, I think we just need a later netstandard.dll for Xamarin.Android (to make Android work) I need some fixes of the 3.0.0 version so downgrading is not an option for me 😦

groege on Oct 1, 2019

I solved by downgrading to efcore 2.6, I think there are some issue with netstandard 2.1 https://devblogs.microsoft.com/dotnet/announcing-entity-framework-core-3-0-preview-8-and-entity-framework-6-3-preview-8/

The project is based on xamarin and it runs on net standard 2.1

@cagianx Yes, the configuration works with no issues running EFCore 2.2.6. Either there are some issues for EFCore 3.0, or there is new configuration that we need to apply.

mduchev on Sep 27, 2019

@smitpatel Here you are a sample project. TestEFC3XamarinApp.zip

Steps to reproduce:

Run the app
Click on the button.
When the button is clicked, we are creating a new entity of type Address.
After the entity is created, we are adding it to Addresses DbSet (here is where the issue occurs)
Before we are able to call SaveChangesAsync, the app crashes with the same exception:

System.TypeLoadException Message=Could not resolve type with token 01000143 from typeref (expected class ‘System.Diagnostics.CodeAnalysis.MaybeNullAttribute’ in assembly ‘netstandard, Version=2.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51’)

NOTE: This is tested on Android project only. The iOS project has other issues - it can’t be run on simulator, nor on a real device. There I am getting these errors: ios_simulator_errors.txt ios_device_errors.txt

I don’t know if I these are reported already, or should I open new issues.

mduchev on Sep 30, 2019

@mduchev same situation here. I notice that Visual Studio 16.3.1 is shipped with an “embedded” version of net core 3, which differ from a standalone installation of netcore 3 sdk.

cagianx on Sep 27, 2019

Actually, I am using the latest stable version - 3.0.100. I haven’t pre-installed any of the preview versions, and I am still getting this exception in my Xamarin projects.

Visual Studio 2019 version 16.3

Package versions: Microsoft.EntityFrameworkCore (Sqlite & Design & Tools) - 3.0.0 SQLitePCLRaw.bundle_e_sqlite3 - 2.0.1

dotnet --info output .NET Core SDK (reflecting any global.json): Version: 3.0.100 Commit: 04339c3a26

Runtime Environment: OS Name: Windows OS Version: 10.0.18362 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\3.0.100\

Host (useful for support): Version: 3.0.0 Commit: 7d57652f33

.NET Core SDKs installed: 3.0.100 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed: Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

mduchev on Sep 25, 2019