Collection was modified; enumeration operation may not execute.

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davethieben

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Nov 11, 2010, 3:54:28 PM11/11/10

to ninject

I have an ASP.NET MVC app using Ninject and for the most part it is
working very well. However I'm noticing in ELMAH every now and then
I'm getting these exceptions, mostly when the load is higher. They
are originating from different places, sometimes from within the .NET
libraries, so I'll post a couple examples. I would appreciate any
thoughts, even if it's just an idea as to how I can start to diagnose
this problem.

most typical, when trying to resolve a Controller:

System.InvalidOperationException: Collection was modified; enumeration
operation may not execute.
at
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource
resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at Ninject.Activation.Caching.Cache.TryGet(IContext context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext
context, ITarget target)
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.Activation.Providers.StandardProvider.Create(IContext
context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext
context, ITarget target)
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.Activation.Providers.StandardProvider.Create(IContext
context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1
source)
at Ninject.ResolutionExtensions.TryGet(IResolutionRoot root, Type
service, IParameter[] parameters)
at
Ninject.Web.Mvc.NinjectControllerFactory.GetControllerInstance(RequestContext
requestContext, Type controllerType)
at
System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext
requestContext, String controllerName)
at System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase
httpContext, IController& controller, IControllerFactory& factory)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase
httpContext, AsyncCallback callback, Object state)
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

----------------------------------------------------------------------------------------

some others:

System.InvalidOperationException: Collection was modified; enumeration
operation may not execute.
at
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource
resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at Ninject.Activation.Caching.Cache.TryGet(IContext context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext
context, ITarget target)
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.Activation.Providers.StandardProvider.Create(IContext
context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext
context, ITarget target)
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.Activation.Providers.StandardProvider.Create(IContext
context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at
Ninject.Activation.Strategies.PropertyInjectionStrategy.Activate(IContext
context, InstanceReference reference)
at
Ninject.Activation.Pipeline.<>c__DisplayClass1.<Activate>b__0(IActivationStrategy
s)
at
Ninject.Infrastructure.Language.ExtensionsForIEnumerableOfT.Map[T]
(IEnumerable`1 series, Action`1 action)
at Ninject.KernelBase.Inject(Object instance, IParameter[]
parameters)
at
Ninject.Web.Mvc.NinjectActionInvoker.GetFilters(ControllerContext
controllerContext, ActionDescriptor actionDescriptor)
at
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext
controllerContext, String actionName)
at System.Web.Mvc.Controller.ExecuteCore()
at
System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__4()
at
System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()
at
System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult
_)
at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()
at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult
asyncResult)
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

----------------------------------------------------------------------------------------

System.InvalidOperationException: Collection was modified; enumeration
operation may not execute.
at
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource
resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at Ninject.Activation.Caching.Cache.TryGet(IContext context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext
context, ITarget target)
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.Activation.Providers.StandardProvider.Create(IContext
context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at Ninject.Activation.Providers.StandardProvider.GetValue(IContext
context, ITarget target)
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.Activation.Providers.StandardProvider.Create(IContext
context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
at
System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource
x)
at
System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1
source)
at Ninject.Planning.Targets.Target`1.ResolveWithin(IContext parent)
at
Ninject.Activation.Strategies.PropertyInjectionStrategy.Activate(IContext
context, InstanceReference reference)
at
Ninject.Activation.Pipeline.<>c__DisplayClass1.<Activate>b__0(IActivationStrategy
s)
at
Ninject.Infrastructure.Language.ExtensionsForIEnumerableOfT.Map[T]
(IEnumerable`1 series, Action`1 action)
at Ninject.KernelBase.Inject(Object instance, IParameter[]
parameters)
at
Ninject.Web.Mvc.NinjectActionInvoker.GetFilters(ControllerContext
controllerContext, ActionDescriptor actionDescriptor)
at
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext
controllerContext, String actionName)
at System.Web.Mvc.Controller.ExecuteCore()
at
System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__4()
at
System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()
at
System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult
_)
at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()
at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult
asyncResult)
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

----------------------------------------------------------------------------------------

System.Reflection.TargetInvocationException: Exception has been thrown
by the target of an invocation. ---> System.InvalidOperationException:
Collection was modified; enumeration operation may not execute.
at
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource
resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at Ninject.Activation.Caching.Cache.TryGet(IContext context)
at Ninject.Activation.Context.Resolve()
at Ninject.KernelBase.<Resolve>b__7(IContext context)
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 EdgeProSheets.Web.MvcApplication.Application_BeginRequest()
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(Object target,
Object[] arguments, SignatureStruct& sig, MethodAttributes
methodAttributes, RuntimeTypeHandle typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj,
BindingFlags invokeAttr, Binder binder, Object[] parameters,
CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj,
BindingFlags invokeAttr, Binder binder, Object[] parameters,
CultureInfo culture)
at System.Web.Util.ArglessEventHandlerProxy.Callback(Object sender,
EventArgs e)
at
System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

Remo Gloor

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Nov 12, 2010, 8:37:57 PM11/12/10

to ninject

Hi Dave

It seems that there is a mutlithreading issue.

Are you manually releasing objects? (kernel.Release(obj))
Which Ninject version do you use?

Remo

Ian Davis

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Nov 12, 2010, 8:48:25 PM11/12/10

to nin...@googlegroups.com

There was a bug like this in an older version, but it was fixed.

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