Question

我使用的是最新版本的web api。我返回IQuerable值，我收到此错误：

iisexpress.exe Error: 0 : Operation=QueryableAttribute.ActionExecuted, Status=200 (OK), Exception=System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateStructuralTypeBody(EdmStructuredType type, IStructuralTypeConfiguration config)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEntityTypeBody(EdmEntityType type, IEntityTypeConfiguration config)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEdmTypeBody(IStructuralTypeConfiguration config)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.<GetEdmTypes>d__0.MoveNext()
   at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.MoveNext()
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey](IEnumerable`1 source, Func`2 keySelector)
   at System.Web.Http.OData.Builder.EdmModelHelperMethods.BuildEdmModel(String containerNamespace, String containerName, IEnumerable`1 entityTypeConfigurations, IEnumerable`1 entitySetConfigurations)
   at System.Web.Http.OData.Builder.ODataModelBuilder.GetEdmModel()
   at System.Web.Http.OData.Builder.ODataConventionModelBuilder.GetEdmModel()
   at System.Web.Http.HttpActionDescriptorExtensions.<>c__DisplayClass1.<GetEdmModel>b__0(Object _)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at System.Web.Http.HttpActionDescriptorExtensions.GetEdmModel(HttpActionDescriptor actionDescriptor, Type entityClrType)
   at System.Web.Http.QueryableAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
   at System.Web.Http.Tracing.Tracers.ActionFilterAttributeTracer.<>c__DisplayClass4.<OnActionExecuted>b__1()
   at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEnd(ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action`1 beginTrace, Action execute, Action`1 endTrace, Action`1 errorTrace)
iisexpress.exe Error: 0 : Operation=InteractionDataController.ExecuteAsync, Exception=System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateStructuralTypeBody(EdmStructuredType type, IStructuralTypeConfiguration config)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEntityTypeBody(EdmEntityType type, IEntityTypeConfiguration config)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEdmTypeBody(IStructuralTypeConfiguration config)
   at System.Web.Http.OData.Builder.EdmTypeBuilder.<GetEdmTypes>d__0.MoveNext()
   at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.MoveNext()
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey](IEnumerable`1 source, Func`2 keySelector)
   at System.Web.Http.OData.Builder.EdmModelHelperMethods.BuildEdmModel(String containerNamespace, String containerName, IEnumerable`1 entityTypeConfigurations, IEnumerable`1 entitySetConfigurations)
   at System.Web.Http.OData.Builder.ODataModelBuilder.GetEdmModel()
   at System.Web.Http.OData.Builder.ODataConventionModelBuilder.GetEdmModel()
   at System.Web.Http.HttpActionDescriptorExtensions.<>c__DisplayClass1.<GetEdmModel>b__0(Object _)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at System.Web.Http.HttpActionDescriptorExtensions.GetEdmModel(HttpActionDescriptor actionDescriptor, Type entityClrType)
   at System.Web.Http.QueryableAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
   at System.Web.Http.Tracing.Tracers.ActionFilterAttributeTracer.<>c__DisplayClass4.<OnActionExecuted>b__1()
   at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEnd(ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action`1 beginTrace, Action execute, Action`1 endTrace, Action`1 errorTrace)
   at System.Web.Http.Tracing.Tracers.ActionFilterAttributeTracer.OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
   at System.Web.Http.Filters.ActionFilterAttribute.CallOnActionExecuted(HttpActionContext actionContext, HttpResponseMessage response, Exception exception)
   at System.Web.Http.Filters.ActionFilterAttribute.<>c__DisplayClass2.<System.Web.Http.Filters.IActionFilter.ExecuteActionFilterAsync>b__0(HttpResponseMessage response)
   at System.Threading.Tasks.TaskHelpersExtensions.<>c__DisplayClass41`2.<Then>b__40(Task`1 t)
   at System.Threading.Tasks.TaskHelpersExtensions.ThenImpl[TTask,TOuterResult](TTask task, Func`2 continuation, CancellationToken cancellationToken, Boolean runSynchronously)

有人可以解释我的问题是什么吗？

Answer 1

我得到同样的错误。我追溯到ODataModelBuilder调用GetEdmModel（）时。我正在使用ODataConventionModelBuilder，我正在声明EntitySets来创建我的模型。在我的例子中，我有一个带有子集合的父类。我尝试了不同类型的集合，IList，List，ICollection，IEnumerable，我继续得到这个错误。我知道这不是最好的解决方案，但我将子集合声明为对象。我使用Linq将集合指定为IEnumerable。我会继续研究这个，但至少我可以继续我的项目。我将不得不继续研究ODataConventionModelBuilder。我希望这至少能指出你正确的方向。

-Jason

Answer 2

这似乎是WebApi.OData包中的已知问题（0.1.0-alpha-120815）。见http://aspnetwebstack.codeplex.com/discussions/394626

web api内部错误500

2 个答案: