How to resolve type using ServiceStack Funq IoC

Question

I\'m trying to write a JobActivator for HangFire using ServiceStack IoC and I\'m having trouble resolving from a type. I\'m sure this will be an easy answer for someone with mo

Answer 1

I would recommend using a different IoC framework, because Funq does not support a resolve method that takes a Type argument, i.e. it does not have a method

object Container.Resolve(Type theType);

Thus the marriage with Hangfire is a difficult one, since Hangfire does not provide an overload that you could use as:

virtual T ActivateJob() where T : class

If you insist on using Funq, this can be (inefficiently) solved like this:

public class FunqJobActivator : JobActivator
{
    private const BindingFlags flags = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance;
    private static readonly _activateMethod = 
        typeof(FunqJobActivator).GetMethod("InternalActivateJob", flags);

    private Funq.Container _container;

    public FunqJobActivator(Funq.Container container)
    {
        if (container == null)
        {
            throw new ArgumentNullException("container");
        }
        _container = container;
    }

    public override object ActivateJob(Type type)
    {
        // this will allow calling InternalActivateJob with typeof(T) == type.
        var method = _activateMethod.MakeGenericMethod(new [] { type });
        return method.Invoke(this, null);
    }

    private object InternalActivateJob() where T : class
    {
        return _container.Resolve();
    }
}