WCF with ninject example - wcf

Question

First of all, I have never seen an example of using ninject with wcf.
This is my .svc:
<%# ServiceHost Language="C#" Debug="true" Service="MyService.Services.NotifyService" %>
My Service:
[ServiceContract]
public interface INotifyService
{
[OperationContract]
void SendEmail(string to, string from, string message);
}
class NotifyService : INotifyService
{
private IEmailRepository emailRepo;
public NotifyService(IEmailRepository emailRepo)
{
if (emailRepo== null) throw new ArgumentNullException("emailRepo");
this.emailRepo= emailRepo;
}
public void SendEmail(string to, string from, string message)
{
//do stuff here
}
}
Using this information, how do I dependency inject MyEmailRepository in NotifyService?
If I do not have a default constructor, wcf throws an error asking for one. I also have experience using ninject with asp.net mvc3 if that helps.

Answer 1

See https://github.com/ninject/ninject.extensions.wcf/tree/master/src/Examples/WcfTimeService

Answer 2

Use a custom IInstanceProvider to resolve your service instance. Here is an example:
http://orand.blogspot.com/2006/10/wcf-service-dependency-injection.html

Answer 3

This answer at SO provides a full implementation to add NInject to a WCF project.
I won't copy and paste it here, but basically, after installing the Ninject, Ninject.Extensions.Wcf and Ninject.Web.Common extensions through Nuget, you'll have to create three classes:
public class NInjectInstanceProvider : IInstanceProvider, IContractBehavior
public class NInjectServiceHostFactory : ServiceHostFactory
public class NInjectServiceHost : ServiceHost
Then point the Factory attribute in your .svc (right click the file on Solution Explorer, then choose "View Markup") to the NInjectServiceHost class:
<%# ServiceHost ... Factory="SomeNamespace.NInjectServiceHostFactory" %>