Is it possible to prevent Delegate Factory creation in Autofac? - dependency-injection

Question

I am updating a library that uses Autofac so that, in addition to the original configuration file (registered via Autofac), it can optionally take a function to accomplish that same goal (again, registered via Autofac). The original is something like this:
public MyClass(ConfigFile config = null)
{
this._activatorLoader = a => {
// old config code here...
}
}
The updated version I'd like is:
public MyClass(
Func<Input, IList<Activator>> activatorLoader = null,
ConfigFile config = null)
{
if (activatorLoader != null)
{
this._activatorLoader = activatorLoader;
}
else
{
this._activatorLoader = a => {
// old config code here...
}
}
}
The problem is that Autofac is seeing my request for a list of something and always providing the function. I tried switching to a delegate and get the same problem:
public delegate IList<Activator> ActivatorLoader(Input input);
public MyClass(
ActivatorLoader activatorLoader = null,
ConfigFile config = null)
{
if (activatorLoader != null)
{
this._activatorLoader = activatorLoader;
}
else
{
this._activatorLoader = a => {
// old config code here...
}
}
}
The loading of the activators must still be delayed, I'd like the flexibility of registering any function based on the situation, and old code (without an activator loader registered) should still work. Is there any way to prevent Autofac from autogenerating the Func?
The class will be instantiated through dependency injection in another class. At a later time, the activator loading code will be triggered (if needed).
var myObject = conatiner.Resolve<MyClass>();
// time passes...
myObject.DoActivatorLoading();
The primary goal is to prevent Autofac from creating the Func<Input, IList<Activator>> if it is not explicitly set. Is this possible?

Answer 1

Perhaps, it will be easier to create a separate class for activator loading ?
public class ActivatorsLoader
{
public IList<Activator> Load(Input input)
{
///
}
}
///
public Class(
ActivatorsLoader activatorsLoader = null,
ConfigFile config = null)
{
///
}
But it would be good to see the use cases of your Class.