c# - Ninject field inject not work in class with constructor -

in c# mvc project, used ninject ioc pattern, when using constructor injection works fine without problem when use field injection, null reference exception occurred _ordernotification.

public class shopmanager {     [inject]     private iordernotification _ordernotification;      public shopmanager(string shopname)     {         //do somethings     }      public int getnotifycount()     {         return _ordernotification.count();     } } 

also registered services in ninjectwebcommon,

kernel.bind<iordernotification>().to<ordernotification>(); 

ninject version 3.0

try this:

  public iordernotification _ordernotification;    public iordernotification ordernotification         {                         {                 return _ordernotification ??                        (_ordernotification = dependencyresolver.current.getservice<iordernotification>());             }             set { _ordernotification = value; }         } 

also can use without constructor:

public class shopmanager {     [inject]     public iordernotification ordernotification { get; set; }      public int getnotifycount()     {         return ordernotification.count();     } }