private ServiceCallSite TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain, int slot)
{
if (serviceType == descriptor.ServiceType)
{
ServiceCallSite callSite;
var lifetime = new ResultCache(descriptor.Lifetime, serviceType, slot);
if (descriptor.ImplementationInstance != null)
{
callSite = new ConstantCallSite(descriptor.ServiceType, descriptor.ImplementationInstance);
}
else if (descriptor.ImplementationFactory != null)
{
callSite = new FactoryCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationFactory);
}
else if (descriptor.ImplementationType != null)
{
callSite = CreateConstructorCallSite(lifetime, descriptor.ServiceType, descriptor.ImplementationType, callSiteChain);
}
else
{
throw new InvalidOperationException("Invalid service descriptor");
}
return(callSite);
}
return(null);
}
protected override Type VisitFactory(FactoryCallSite factoryCallSite, CallSiteValidatorState state) => null;
protected override object VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
{
return(factoryCallSite.Factory(context.Scope));
}
protected abstract TResult VisitFactory(FactoryCallSite factoryCallSite, TArgument argument);
