Invalid type owner for DynamicMethod

Hi!

i’m on webapi 2, .net 4.51

i’ve installed version 5.0.1 via the package manager with no modifications, when i browse to [root]/swagger/docs/v1 i get the following json

{ “message”: “An error has occurred.”, “exceptionMessage”: “Invalid type owner for DynamicMethod.”, “exceptionType”: “System.ArgumentException”, “stackTrace”: " at System.Reflection.Emit.DynamicMethod.Init(String name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] signature, Type owner, Module m, Boolean skipVisibility, Boolean transparentMethod, StackCrawlMark& stackMark)\r\n at System.Reflection.Emit.DynamicMethod…ctor(String name, Type returnType, Type[] parameterTypes, Type owner, Boolean skipVisibility)\r\n at Newtonsoft.Json.Utilities.DynamicReflectionDelegateFactory.CreateDynamicMethod(String name, Type returnType, Type[] parameterTypes, Type owner)\r\n at Newtonsoft.Json.Utilities.DynamicReflectionDelegateFactory.CreateDefaultConstructor[T](Type type)\r\n at Newtonsoft.Json.Serialization.DefaultContractResolver.InitializeContract(JsonContract contract)\r\n at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateObjectContract(Type objectType)\r\n at Newtonsoft.Json.Serialization.DefaultContractResolver.CreateContract(Type objectType)\r\n at Newtonsoft.Json.Serialization.DefaultContractResolver.ResolveContract(Type type)\r\n at Swashbuckle.Swagger.SchemaRegistry.CreateInlineSchema(Type type, String refPrefix)\r\n at Swashbuckle.Swagger.SchemaRegistry.GetOrRegister(Type type)\r\n at Swashbuckle.Swagger.SwaggerGenerator.CreateParameter(ApiParameterDescription paramDesc, Boolean inPath, SchemaRegistry schemaRegistry)\r\n at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()\r\n at System.Collections.Generic.List1…ctor(IEnumerable1 collection)\r\n at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)\r\n at Swashbuckle.Swagger.SwaggerGenerator.CreateOperation(ApiDescription apiDescription, SchemaRegistry schemaRegistry)\r\n at Swashbuckle.Swagger.SwaggerGenerator.CreatePathItem(IEnumerable1 apiDescriptions, SchemaRegistry schemaRegistry)\r\n at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer)\r\n at Swashbuckle.Swagger.SwaggerGenerator.GetSwagger(String rootUrl, String apiVersion)\r\n at Swashbuckle.Application.SwaggerDocsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpMessageInvoker.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Web.Http.Dispatcher.HttpRoutingDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Web.Http.Tracing.Tracers.RequestMessageHandlerTracer.<>c__DisplayClass4.<SendAsync>b__1()\r\n at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEndAsync[TResult](ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action1 beginTrace, Func1 execute, Action2 endTrace, Action`1 errorTrace)\r\n at System.Web.Http.Tracing.Tracers.RequestMessageHandlerTracer.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Web.Http.HttpServer.<SendAsync>d__0.MoveNext()" }

i’ve read through all the documentation, so sorry if i’ve missed something… any clues as to what i’m doing wrong? please let me know if you need any more information, ta!

[waratah]

In my case I had a base class for the rest of my controllers and the logic was finding this. [ApiExplorerSettings(IgnoreApi = true)] resolved my issue but this is something worthwhile considering while you find the problem.

Nice to have would be a way to record the API call that is generating the error.

[qwertykeith]

it’s so obvious now, thanks for that! there was some dodgy properties in my webapi base class, i just used [ApiExplorerSettings(IgnoreApi = true)] to hide them and all is good now… thanks! 😃