There are several reasons you might see the error “No parameterless constructor defined for this object” but I often see it in conjunction with Dependency Injection. My setup is .NET MVC with Ninject, but I imagine this is applicable to many other combinations. I use constructor injection to pass services and repositories to my controllers.
The error is triggered when you request an instance of a service you have not wired up properly in your DI config. It’s a classic case of the error message not actually telling you what the real problem is. For example, I just added the new dependency on IDirectDebitProvider to my BillingController:
public BillingController(IOrganisationRepository org, IDirectDebitProvider dd)
{
// implementation
}
However, I had not added the following line to my Ninject configuration:
kernel.Bind<IDirectDebitProvider>().To<SmartDebit>();
For more, read our getting started guide for DI with ASP.NET MVC.
