Unity IoC does not inject dependency into Web API Controller

Question

I\'m very new to using Unity, but my problem is that whenever I call my web service, I get an exception stating that

\"Make sure that the controller has a parameterl

Answer 1

So, after hours of banging my head against a wall, I've found that this wasn't working because I had an OWIN/Katana Startup.cs class in my project. Now I don't know exactly what's going on here, so any more information would be great.

Basically, since I was using OWIN/Katana, I had a Startup.cs file that created a new HttpConfiguration object and configured it, similar to how it's done in the WebApiConfig.cs class.

private void ConfigureWebApi(HttpConfiguration config)
{
    config.MapHttpAttributeRoutes();
    var container = new UnityContainer();
    container.RegisterType();
    config.DependencyResolver = new UnityDependencyResolver(container);

    var jsonFormatter = config.Formatters.OfType

It looks like the code first runs through the WebApiConfig's Register function, and THEN overrides that HttpConfiguration object with the one generated in the Startup.cs file. I had to move my container setup stuff here in order for it to work.

Sorry that I didn't bring up the OWIN stuff before. This is fairly new to me and I didn't realize it was relevant. Hopefully this saves someone else the pain that I've just been through.