c# - WCF Service with parameterized constructor -

i using .net 4.5, c#.net, wcf repository pattern

wcf service

• customer.svc: <@ servicehost language="c#" service="customerservice" @>
• order.svc: <@ servicehost language="c#" service="orderservice" @>
• sales.svc: <@ servicehost language="c#" service="salesservice" @>
• products.svc: <@ servicehost language="c#" service="productsservice" @>

implementing classes

public class customerservice : service<customer>, icustomerservice.cs {    private readonly irepositoryasync<customer> _repository;    public customerservice(irepositoryasync<customer> repository)    {       _repository = repository;    } }  public class ordersservice : service<orders>, iordersservice.cs {    private readonly irepositoryasync<order> _repository;    public ordersservice(irepositoryasync<order> repository)    {       _repository = repository;    } }  public class salesservice : service<sales>, isalesservice.cs {    private readonly irepositoryasync<sales> _repository;    public salesservice(irepositoryasync<sales> repository)    {       _repository = repository;    } } 

when run wcf service, error there no empty constructor. how can keep these services , implementing classes unchanged , have wcf service work constructors.

wcf requires service host have default/no-argument constructor; standard wcf service creation implementation no fancy activation - , not handle dependency injection! - when creating service host object.

to bypass default requirement, use wcf service host factory (such 1 provided castle windsor wcf integration) create service , inject dependencies using appropriate constructor. other iocs provided own integration factories. in case ioc-aware service factory creates service , wires dependencies.

to use di without ioc (or otherwise dealing service factory), create no-argument constructor invokes constructor required dependencies, e.g.

public class salesservice : service<sales>, isalesservice {    private readonly irepositoryasync<sales> _repository;     // constructor wcf's default factory calls    public salesservice() : this(new ..)    {    }     protected salesservice(irepositoryasync<sales> repository)    {       _repository = repository;    } }