Commented Issue: Reflection exception when probing for WebAPI controllers [292]

I am trying to add webAPI to my existing .Net 4 RC app. When I try to access the webAPI route I get errors like:

<Exception xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/System.Web.Http.Dispatcher"><ExceptionType>System.IO.FileNotFoundException</ExceptionType><Message>Could not load file or assembly 'DevExpress.XtraEditors.v11.1, Version=11.1.8.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a' or one of its dependencies. The system cannot find the file specified.</Message><StackTrace>
Server stack trace:
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at System.Web.Http.Dispatcher.DefaultHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)
at System.Web.Http.WebHost.WebHostHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)
at System.Web.Http.Dispatcher.HttpControllerTypeCache.InitializeCache()
at System.Lazy`1.CreateValue()

Exception rethrown at [0]:
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at System.Web.Http.Dispatcher.DefaultHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)
at System.Web.Http.WebHost.WebHostHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)
at System.Web.Http.Dispatcher.HttpControllerTypeCache.InitializeCache()
at System.Lazy`1.CreateValue()
at System.Lazy`1.LazyInitValue()
at System.Lazy`1.get_Value()
at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.InitializeControllerInfoCache()
at System.Lazy`1.CreateValue()

Exception rethrown at [1]:
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at System.Web.Http.Dispatcher.DefaultHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)
at System.Web.Http.WebHost.WebHostHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)
at System.Web.Http.Dispatcher.HttpControllerTypeCache.InitializeCache()
at System.Lazy`1.CreateValue()
at System.Lazy`1.LazyInitValue()
at System.Lazy`1.get_Value()
at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.InitializeControllerInfoCache()
at System.Lazy`1.CreateValue()
at System.Lazy`1.LazyInitValue()
at System.Lazy`1.get_Value()
at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.SelectController(HttpRequestMessage request)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)</StackTrace></Exception>

BTW: Here is the code from MVC that is used by the area registration. It simply catches the error and moves on. I'm not sure why WebAPI doesn't do the same thing, or even use the same code.


private static IEnumerable<Type> FilterTypesInAssemblies(Predicate<Type> predicate) {
// Go through all assemblies referenced by the application and search for types matching a predicate
IEnumerable<Type> typesSoFar = Type.EmptyTypes;

ICollection assemblies = BuildManager.GetReferencedAssemblies();
foreach (Assembly assembly in assemblies) {
Type[] typesInAsm;
try {
typesInAsm = assembly.GetTypes();
}
catch (ReflectionTypeLoadException ex) {
typesInAsm = ex.Types;
}
typesSoFar = typesSoFar.Concat(typesInAsm);
}
return typesSoFar.Where(type => TypeIsPublicClass(type) && predicate(type));
}

Comments: Thanks for the report -- the problem was fixed in this commit [1] and is available in RTM as well as the latest nightly builds. Thanks, [1] http://aspnetwebstack.codeplex.com/SourceControl/changeset/07f8232f33af