Question

UnityContainer.Resolve() will instantiate classes that have not been explicitly registered by means of reflection, allowing this sort of thing:

using System;
using Microsoft.Practices.Unity;

namespace ConsoleApplication2
{
    public class Foo
    {
        public void SayHello()
        {
            Console.WriteLine("Hello");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var container = new UnityContainer();
            var foo = container.Resolve<Foo>();
            foo.SayHello();
        }
    }
}

My question is, it is possible to disable this behaviour if I want to, so that the class is not automatically resolved (with either an exception being raised, or a null being returned?)

Answer 1

It’s not built in, but you could write a container extension which would change this behavior. It would require two things – first off, a handler for the registering event that recording when a type was registered in the policy list, and second, a strategy that would check the “is registered” policy and throw if it’s not there.

Its fairly small & easy to do if you’re familiar with writing extensions. Unfortunately I don’t have the time to put one together right now, sorry.