I have a somewhat complex trading application that handles lots of Event messages. It is a Windows MEF application that loads assemblies automatically at runtime.
I decided to try Microsoft.StreamProcessing to convert events to IStreamable. I moved in slow steps. First, I just added the assembly through nuget to my project. Then added
using Microsoft.StreamProcessing;
to the code, but did not declare any types. Runs fine.
Next, I added a single line to the code:
IStreamable<Empty, IQuote> markeDatatStream;
That's all I did. I am not using it in any way, just added that one line. This time, while the program is loading, I get the following exception. When I look inside the recommended LoaderExceptions field, I get:
{"Could not load file or assembly 'System.Runtime.Loader, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.":"System.Runtime.Loader, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"}
If I remove the single line from the code
IStreamable<Empty, IQuote> markeDatatStream;
It works fine.
The full exception:
System.Reflection.ReflectionTypeLoadException
HResult=0x80131602
Message=Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
Source=mscorlib
StackTrace:
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.Assembly.GetTypes()
at System.ComponentModel.Composition.Hosting.AssemblyCatalog.get_InnerCatalog()
at System.ComponentModel.Composition.Hosting.AssemblyCatalog.GetExports(ImportDefinition definition)
at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
at System.ComponentModel.Composition.Hosting.CatalogExportProvider.InternalGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExports(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.AggregateExportProvider.GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.CompositionContainer.GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ExportProvider.TryGetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition, IEnumerable`1& exports)
at System.ComponentModel.Composition.Hosting.ExportProvider.GetExports(ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ImportEngine.TryGetExports(ExportProvider provider, ComposablePart part, ImportDefinition definition, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImportSubset(PartManager partManager, IEnumerable`1 imports, AtomicComposition atomicComposition)
at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImportsStateMachine(PartManager partManager, ComposablePart part)
at System.ComponentModel.Composition.Hosting.ImportEngine.TrySatisfyImports(PartManager partManager, ComposablePart part, Boolean shouldTrackImports)
at System.ComponentModel.Composition.Hosting.ImportEngine.SatisfyImports(ComposablePart part)
at System.ComponentModel.Composition.Hosting.CompositionServices.TryInvoke(Action action)
at System.ComponentModel.Composition.Hosting.ComposablePartExportProvider.Compose(CompositionBatch batch)
at Trader.MainForm.InitializeTradingEngine() in C:\Users\idf\Projects\Trader-Orig-Working\Trader\Trader\MainForm.cs:line 200
at Trader.MainForm..ctor(String logFilePath) in C:\Users\idf\Projects\Trader-Orig-Working\Trader\Trader\MainForm.cs:line 113
at Trader.Program.Main() in C:\Users\idf\Projects\Trader-Orig-Working\Trader\Trader\Program.cs:line 231
The problem here is probably strong naming.
In summary:
If you include library A, which is strong named, and uses library B with assembly-version 1.0.0.0 and you are using Library B, but with assembly-version 1.1.0.0, then you will get loads errors - with the confusing error "The system cannot find the file specified"
You need then a binding:
<dependentAssembly>
<assemblyIdentity name="B" publicKeyToken="32ab4ba45e0a69a1" culture="en-us" />
<bindingRedirect oldVersion="1.0.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
So someone builds to System.Runtime.Loader, Version=4.0.0.0, in your application, but you're probably (maybe via another library) providing another version of System.Runtime.Loader.
another option is add the System.Runtime.Loader versions to the GAC