private MefHostServices CreateMefHostServices(IEnumerable <Assembly> assemblies)
{
ExportProvider exportProvider;
if (assemblies is ImmutableArray <Assembly> array &&
array == MefHostServices.DefaultAssemblies &&
ExportProviderCache.LocalExportProviderForCleanup != null)
{
if (_hostServices != null)
{
return(_hostServices);
}
exportProvider = ExportProviderCache.LocalExportProviderForCleanup;
}
else
{
exportProvider = ExportProviderCache.GetOrCreateExportProviderFactory(assemblies).CreateExportProvider();
}
Interlocked.CompareExchange(
ref _hostServices,
new ExportProviderMefHostServices(exportProvider),
null);
return(_hostServices);
}
private MefHostServices CreateMefHostServices(IEnumerable <Assembly> assemblies, bool requestingDefaultAssemblies)
{
if (requestingDefaultAssemblies && ExportProviderCache.ExportProviderForCleanup != null)
{
if (_hostServices == null)
{
var hostServices = new ExportProviderMefHostServices(ExportProviderCache.ExportProviderForCleanup);
Interlocked.CompareExchange(ref _hostServices, hostServices, null);
}
return(_hostServices);
}
var catalog = ExportProviderCache.GetOrCreateAssemblyCatalog(assemblies);
Interlocked.CompareExchange(
ref _hostServices,
new ExportProviderMefHostServices(ExportProviderCache.GetOrCreateExportProviderFactory(catalog).CreateExportProvider()),
null);
return(_hostServices);
}