Refactoring_to_improve_maintainability_and_blendability_using_IoC_part_2_03.cs

public interface IViewModelResolver
{
    IViewModel Resolve();
}

public class FunqViewModelResolver : IViewModelResolver
{
    private readonly Container container;
    private Dictionary<type  , MethodInfo> methods = null;
    private MethodInfo method = null;

    public FunqViewModelResolver(Container container)
    {
        this.container = container;

        method = container.GetType().GetMethod(
            "Resolve", new Type[0]);

        methods = new Dictionary<Type,MethodInfo>();
    }

    public IViewModel Resolve(Type viewModelType)
    {
        MethodInfo genericMethod = null;
        if (!methods.TryGetValue(viewModelType, out genericMethod))
        {
            genericMethod = method.MakeGenericMethod(viewModelType);
            methods.Add(viewModelType, genericMethod);
        }

        var result = genericMethod.Invoke(container, null);
        return (IViewModel) result;
    }
}