Ninject - Injecting a dependency into a namespace

Question

I'm attempting to conditionally bind a dependency when it's injected into a certain namespace. I found a Ninject article on conditional binding where it says the following:

We can also provide conditional logic by providing a delegate. In this case are asking the class its name and namespace.

Bind().To().When(request => request.Target.Member.Name.StartsWith("ClassName")); Bind().To().When(request => request.Target.Type.Namespace.StartsWith("NameSpace.ClassName"));

So I've tried to implement this as follows:

Bind<ILogger>().ToMethod(x => new Logger("commissionServiceLogger")).When(x => x.Target.Type.Namespace.StartsWith("My.App.CommissionService"));

I'm getting a null reference exception, though:

Object reference not set to an instance of an object.

Any idea what I'm doing wrong?

Answer 1

x.Target.Type will give you the dependency that you are trying to resolve. In your case, this is ILogger.

I am guessing that you mean to base the logic on the type of object in which ILogger is to be injected. In this case, you need to use x.ParentContext.Plan.Type like this:

Bind<ILogger>().ToMethod(x => new Logger("commissionServiceLogger")).When(x =>
{
    return x.ParentContext != null &&
         x.ParentContext.Plan
         .Type.Namespace
         .StartsWith("My.App.CommissionService");
});

ParentContext would be null in the case where you try to resolve ILogger directly.