After checking all the similar questions on SO, my issue persists so I'm opening a new question for it.
I have a unit test that references anther project that contains a MVC 4 ApiController
which has a constructor for dependency injection.
public class DataController : ApiController
{
public DataController(IRepository repository){}
}
In my test, I'm using Microsoft.Extensions.DependencyInjection
and have the following setup:
// Note: this redundant type access is necessary to load controllers from a different assembly,
// see https://stackoverflow.com/a/11758025/1468097
var type = typeof(DataController);
var services = new ServiceCollection().AddSingleton<IRepository>(new ImMemoryRepository());
var httpConfiguration = new HttpConfiguration
{
DependencyResolver = new DependencyResolver(services.BuildServiceProvider()),
IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always
};
httpConfiguration.Routes.MapHttpRoute("Default", "{controller}/{action}");
httpConfiguration.DependencyResolver = new DependencyResolver(services.BuildServiceProvider());
var httpServer = new HttpServer(httpConfiguration);
var client = new HttpClient(httpServer);
var response = await client.GetAsync("http://whatever/data/getdata?id=000");
and I have a fairly barebone implementation of the dependency resolver as nested private class inside the test class:
private class DependencyResolver : IDependencyResolver
{
private readonly ServiceProvider _serviceProvider;
public DependencyResolver(ServiceProvider serviceProvider) => _serviceProvider = serviceProvider;
public void Dispose() => _serviceProvider.Dispose();
public object GetService(Type serviceType) => _serviceProvider.GetService(serviceType);
public IEnumerable<object> GetServices(Type serviceType) => _serviceProvider.GetServices(serviceType);
public IDependencyScope BeginScope() => new Scope(_serviceProvider.CreateScope());
private class Scope : IDependencyScope
{
private readonly IServiceScope _scope;
public Scope(IServiceScope scope) => _scope = scope;
public void Dispose() => _scope.Dispose();
public object GetService(Type serviceType) => _scope.ServiceProvider.GetService(serviceType);
public IEnumerable<object> GetServices(Type serviceType) => _scope.ServiceProvider.GetServices(serviceType);
}
}
The response I get from the test is a 500 server error saying
Type 'Mvc.DataController' does not have a default constructor
It seems I'm doing what all the others are doing for dependency injection in MVC 4, even for this question that has a very similar symptom.
Am I missing something obvious here?
Update
I've tried NinjectResolver
comes down to the same problem:
var kernel = new StandardKernel();
kernel.Bind<IRepository>().ToConstant(new InMemoryRepository());
var httpConfiguration = new HttpConfiguration
{
DependencyResolver = new NinjectResolver(kernel)
};
CodePudding user response:
I figured this out.
The key is that you also need to add the controller you are hitting in your dependency configuration.
In my case, I just need to add:
var services = new ServiceCollection();
// This is what was missing.
services.AddTransient<DataController>();
Taken from here (although I'm not using OWIN at all): How to add Microsoft.Extensions.DependencyInjection to OWIN Self-Hosted WebApi
Another example using Autofac:
var builder = new ContainerBuilder();
// You need to register the assembly that contains your controller.
builder.RegisterApiControllers(typeof(DataController).Assembly);
Taken from here: Dependency injection not working with Owin self-hosted Web Api 2 and Autofac