Question

I am using Ninject together with MVC3 to inject my controller dependencies. Sometimes I get slow timings in MVC Mini profiler even before the controller actions are executed. Since I don’t do much before that time I thought it might be an issue with my usage of Ninject. Is there an existing way to get some timing information from ninject? Perhaps a config option to log how long dependency resolution took or if not what would be a good way to add this myself, is there a class I can extend or wrap?

Answer 1

You can write a decorator for the NinjectDependencyResolver by implementing the IDependencyResolver interface and replace it on the DependencyResolver.

DependencyResolver.SetResolver(new ProfilingResolver(DependencyResolver.Current));

public class ProfilingResolver : IDependencyResolver
{
    private readonly IDependencyResolver decoratedResolver;

    public ProfilingResolver(IDependencyResolver decoratedResolver)
    {
        this.decoratedResolver = decoratedResolver;
    }

    public object GetService(Type serviceType)
    {
        using (MiniProfiler.Current.Step("Get_" + serviceType.Name))
        {
            return this.decoratedResolver.GetService(serviceType);
        }
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        using (MiniProfiler.Current.Step("GetAll_" + serviceType.Name))
        {
            return this.decoratedResolver.GetServices(serviceType);
        }
    }
}