Issues with Xamarin.iOS

I’ve been working on a .NET Standard 2.0 library for a while now, an using Scrutor with FromApplicationDependencies() has been working fine in my unit tests.

However, when Scrutor is used in Xamarin.iOS both FromApplicationDependencies() and FromDependencyContext(DependencyContext.Load(Assembly.GetEntryAssembly())) throw an exception:

The type initializer for 'Microsoft.Extensions.DependencyModel.DependencyContextLoader' threw an exception.

...

System.NotImplementedException: The method or operation is not implemented.

...

  at System.AppContext.GetData (System.String name) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/10.12.0.18/src/mono/mcs/class/referencesource/mscorlib/system/AppContext/AppContext.cs:46 
  at Microsoft.Extensions.DependencyModel.DependencyContextPaths.GetCurrent () [0x00000] in <8241b70107294c1cb31f55eb9c49a4a8>:0 
  at Microsoft.Extensions.DependencyModel.DependencyContextPaths..cctor () [0x0000a] in <8241b70107294c1cb31f55eb9c49a4a8>:0 

I tried getting around this by doing the following:

var entryAssembly = Assembly.GetEntryAssembly();
var entryDependencyAssemblies = entryAssembly.GetReferencedAssemblies();
List<Assembly> scanAssemblies = new List<Assembly> { entryAssembly };
foreach (var assemblyName in entryDependencyAssemblies)
{
    var assembly = Assembly.Load(assemblyName);
    scanAssemblies.Add(assembly);
}

...

.FromAssemblies(scanAssemblies)

Unfortunately Scrutor is not finding any classes when I do this. Not sure if it matters, but I specify an array of base types that I scan for, like this:

.AddClasses(classes => classes.Where(c => scanTypes.Contains(c.BaseType)))

Note that the debugger is showing that scanAssemblies does contain the correct assemblies, and I can see the types I want under DefinedTypes.

Even a hacky workaround would be very much appreciated at this point!

[khellang]

@Dids Pushed a new version, 2.1.0 to NuGet with a new method, FromAssemblyDependencies, that does more or less what your code above does. FromApplicationDependencies will now also fall back to this method, using the entry assembly when the DependencyContext fails to load, i.e. on Xamarin/Mono.

[khellang]

I’m closing this due to lack of activity. I’m assuming everything sorted itself out with the new methods 😄