Ninject Intermittent exception thrown related to OnePerRequestModule

Question

I just upgraded an existing implementation of Ninject from 1.5 to 2.0. I'm now seeing an intermittent exception getting thrown when many requests are happening in a short period of time.

Here's the exception that is being thrown.

Type: System.ArgumentException
Message: An item with the same key has already been added.
Source: Ninject
Stack Trace: at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
at Ninject.Components.ComponentContainer.CreateNewInstance(Type component, Type implementation)
at Ninject.Components.ComponentContainer.ResolveInstance(Type component, Type implementation)
at Ninject.Components.ComponentContainer.Get(Type component)
at Ninject.Components.ComponentContainer.<CreateNewInstance>b__6(ParameterInfo parameter)
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at Ninject.Components.ComponentContainer.CreateNewInstance(Type component, Type implementation)
at Ninject.Components.ComponentContainer.ResolveInstance(Type component, Type implementation)
at Ninject.Components.ComponentContainer.Get(Type component)
at Ninject.Components.ComponentContainer.GetT
at Ninject.KernelBase.CreateContext(IRequest request, IBinding binding)
at Ninject.KernelBase.<>c__DisplayClassa.<Resolve>b__6(IBinding binding)
at System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource x)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.<CastIterator>d__aa`1.MoveNext()
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
at Ninject.ResolutionExtensions.Get[T](IResolutionRoot root, IParameter[] parameters)
at NameOfConsumingSite.Application_BeginRequest(Object sender, EventArgs e)...

The exception does not get thrown if I remove the OnePerRequestModule item from httpModules in web.config, but that is adding a ton of overhead.

I thank anyone in advance if they can help!

Answer 1

There was a multithreading problem. Try to use the 2.2 RC1 found at https://github.com/ninject . Please tell me if this problem still occurs with this version to make sure we have no further issue we have to fix before release.