Func

The second way to add factories is to inject a Func to the class that needs to create a new object. Like the factory interface it supports arguments too. But since a Func gives you absolutely no information about the parameters you have to pass, I recommend not using Func unless it takes no arguments. Even if it takes no arguments I personally think factory interfaces is the cleaner way to add factories. You have to write more code but the readability is better than with Func.

public class Foo
{
    private Func<Bar> barFactroy;
    public Foo(Func<Bar> barFactory)
    {
        this.barFactory = barFactory;
    }
 
    public void Do()
    {
        var bar = this.barFactroy();
        ...
    }
}

That’s everything you have to do in this case. There is no need to create a special binding for the Func.