Model Size Limited

I posted the below in the EF Core Repository thinking that the error was being produced by EF Core. According to them, the error is coming from Automapper itself. I am using the ProjectTo Queryable Extension.

I have a fairly large Model object with a lot of nested arrays and objects. Works fine in EF6. However attempting to project the same in EF Core throws an error. Its a fairly simple projection and I can tell its something to do with the size of the model that is throwing the error. If I comment out ANY two of the nested objects the error goes away. If I breakup the same model into two or three different objects with the same projection, it works.

Exception message: ArgumentException: Type name was too long. The fully qualified type name must be less than 1,024 characters.
 Parameter name: fullname
Stack trace:
System.Reflection.Emit.TypeBuilder.Init(string fullname, TypeAttributes attr, Type parent, Type[] interfaces, ModuleBuilder module, PackingSize iPackingSize, int iTypeSize, TypeBuilder enclosingType)
System.Reflection.Emit.ModuleBuilder.DefineType(string name, TypeAttributes attr, Type parent, Type[] interfaces)
AutoMapper.Execution.ProxyGenerator.EmitProxy(TypeDescription typeDescription) in ProxyGenerator.cs
AutoMapper.LockingConcurrentDictionary<TKey, TValue>+<>c__DisplayClass2_1.<.ctor>b__1() in LockingConcurrentDictionary.cs
System.Lazy<T>.ViaFactory(LazyThreadSafetyMode mode)
System.Lazy<T>.ExecutionAndPublication(LazyHelper executionAndPublication, bool useDefaultConstructor)
System.Lazy<T>.CreateValue()
AutoMapper.Execution.ProxyGenerator.GetSimilarType(Type sourceType, IEnumerable<PropertyDescription> additionalProperties) in ProxyGenerator.cs
AutoMapper.QueryableExtensions.ExpressionBuilder+FirstPassLetPropertyMaps.GetSubQueryExpression(ExpressionBuilder builder, Expression projection, TypeMap typeMap, ExpressionRequest request, Expression instanceParameter, IDictionary<ExpressionRequest, int> typePairCount) in ExpressionBuilder.cs
AutoMapper.QueryableExtensions.ExpressionBuilder.CreateMapExpression(ExpressionRequest request, IDictionary<ExpressionRequest, int> typePairCount, LetPropertyMaps letPropertyMaps) in ExpressionBuilder.cs
System.Lazy<T>.ViaFactory(LazyThreadSafetyMode mode)
System.Lazy<T>.ExecutionAndPublication(LazyHelper executionAndPublication, bool useDefaultConstructor)
System.Lazy<T>.CreateValue()
AutoMapper.QueryableExtensions.ExpressionBuilder.GetMapExpression(Type sourceType, Type destinationType, object parameters, MemberInfo[] membersToExpand) in ExpressionBuilder.cs
AutoMapper.QueryableExtensions.ProjectionExpression.To<TResult>(object parameters, Expression<Func<TResult, object>>[] membersToExpand) in ProjectionExpression.cs
AutoMapper.QueryableExtensions.Extensions.ProjectTo<TDestination>(IQueryable source, Expression<Func<TDestination, object>>[] membersToExpand) in Extensions.cs
FinBrook.Application.FindDealByIdQueryHandler.Handle(FindDealByIdQuery request, CancellationToken cancellationToken) in FindDealByIdQueryHandler.cs
+
            return await _context.Deals
FinBrook.Application.RequestPerformanceBehaviour<TRequest, TResponse>.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate<TResponse> next) in RequestPerformanceBehaviour.cs
+
            var response = await next();
MediatR.Pipeline.RequestPreProcessorBehavior<TRequest, TResponse>.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate<TResponse> next)
FinBrook.API.Deals.DealsController.FindDealByIdAsync(int id) in DealsController.cs
+
            return Ok(await Mediator.Send(new FindDealByIdQuery()
lambda_method(Closure , object )
Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable+Awaiter.GetResult()
Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor+AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, object controller, object[] arguments)
System.Threading.Tasks.ValueTask<TResult>.get_Result()
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextExceptionFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ExceptionContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.MigrationsEndPointMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Steps to reproduce

I cant reproduce the model here as its fairly large. However, if really necessary I’ll try and post it.

Further technical details

EF Core version: 2.1.3 Database Provider: Microsoft.EntityFrameworkCore.SqlServer Operating system: Windows 10 IDE: VS 15.8

[czb182]

fyi, I got this same error today on an EF 6.2.0 app after upgrading to automapper 7.0.1 from 6.2.2.

[lock[bot]]

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