Ninject inject a service interface in a web service

Question

I have a web service in my project that I use to return json data to ajax calls.

Injecting my ClientService works fine on regular pages but how do I get it to work in the Web Service?

NinjectWebCommon.cs:

 private static void RegisterServices(IKernel kernel)
        {
            kernel.Bind<IClientService>().To<ClientService>();
        }

Default.aspx.cs: works!

public partial class _Default : System.Web.UI.Page
    {
 [Inject]
        public IClientService clientService { get; set; }

MyWebservice.asmx: NullReferenceException (clientService is null)

 public class MyWebService: System.Web.Services.WebService
    {     
        [Inject]
        public IClientService clientService { get; set; } 


 [WebMethod, ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public MyObject GetClients(int id)
        {
            var list = clientService.GetClients(id);

Have you looked at any of the samples to see if there is an example of a WebService being Injected? — Ruben Bartelink, May 06 '13 at 19:59
The only examples I can find are http://stackoverflow.com/questions/10765424/how-to-manually-instantiate-objects-using-ninject-for-mvc-3. Although it seems that the DependencyResolver class doesn't exist in the latest version of ninject? — woggles, May 07 '13 at 06:06
I mean on github.com/ninject - I havent looked but I'd be surprised if there isnt an asmx somewhere. Note that the DependencyResolver stuff is in a different NuGet package (again, see an MVC sample) — Ruben Bartelink, May 07 '13 at 08:23
Have you solved this. I really need this and cant get it to work... — Patrick, May 14 '13 at 16:38
Nope I haven't - please post a solution if you manage to find one! — woggles, May 16 '13 at 05:32
@LaurenceNyein haven't looked at this in ages, but don't think I had any luck or I would have posted the answer — woggles, Feb 04 '14 at 12:05

score 7 · Accepted Answer · edited May 22 '14 at 16:32

7

I have solved this problem. I changed MyWebService class to derive from Ninject.Web.WebServiceBase:

public class MyWebService: WebServiceBase

edited May 22 '14 at 16:32

alan

6,705
9
40
70

answered Feb 04 '14 at 19:14

SnowWhite

190
1
3
9

If you using NinjectWebCommon, maybe you need Install-Package Ninject.Web and remove NinjectWeb.cs auto created – Gustavo Rossi Muller Jun 08 '18 at 15:12

score 1 · Answer 2 · answered Nov 17 '21 at 10:47

I run on the same problem. Took me a while to figure it out. My solution to this problem is adding statatic Ninject instantiation of Kernel in Global.asax :

  public class Global : NinjectHttpApplication 
    {
        private static Ninject.IKernel kernel = new Ninject.StandardKernel();

        protected override Ninject.IKernel CreateKernel()
        {

            //Business TI
            kernel.Bind<IYourService>().To<YourService>();

            return kernel;
        }
}

What enables to get it directly from singleton(public) or which solution I choosed, by accesing NinjectHttpApplication's context : //in webservice parameterless constructor

yourService = ((NinjectHttpApplication)HttpContext.Current.ApplicationInstance).Kernel.Get<IPublicationService>();

This is the solution for working with legacy asmx web service, putting aside

Ninject inject a service interface in a web service

2 Answers2

Linked