Missing Method Exception related to IoC( Unity Container )

question
1

I’m using hangfire for bulk data deletion job. Here is my code below:

public class JobScheduler: IScheduler
    {
        private BackgroundJobClient client;
        private MyDao dao;        

        public JobScheduler(MyDao daoObj)
        {
            this.dao= daoObj;
            this.client = new BackgroundJobClient();
        }

        public string EnqueueJob(IRequestMessage message)
        {           
            return client.Enqueue(() => dao.BulkDelete(requestMsg));            
        }
    }
}

 public class MyDao: IDao
    {
        private readonly string connectionString;        

        public MyDao(string connectionString)
        {
            this.connectionString = connectionString;
        }  

        public void BulkDelete(IRequestMessage  message)
       {
           // My delete operation here..
       }
}

http://docs.hangfire.io/en/latest/background-methods/using-ioc-containers.html

Followed as mention in the documentation to inject the dependency. I m using Unity Container for IoC.

I m still getting this error:

System.MissingMethodException

No parameterless constructor defined for this object.

2

How do you configure Unity? How do you configure Hangfire to use Unity?

3

To move ahead. I have created a default constructor. Now it is not giving error. Coming back to configuration. Below is what i have done:

public class ContainerJobActivator : JobActivator
{
private IContainer _container;

public ContainerJobActivator(IContainer container)
{
    _container = container;
}

public override object ActivateJob(Type type)
{
    return _container.Resolve(type);
}

}

//In HangfireBootstrapper.cs add a static method as below:
public void InjectContainer(UnityContainer container)
{
ContainerJobActivator activator = new ContainerJobActivator(container);
Hangfire.JobActivator.Current = activator;
}

In global.ascx

//In Global.asax.cs file
UnityContainer container = new UnityContainer();

ContainerRegistry.AddDaoTo(container);
ContainerRegistry.RegisterHandlers(container);

HangfireBootstrapper.Instance.InjectContainer(container);

4

Continue … But when there is no default constructor. Above code, don’t work as expected and gives me error(No parameter-less constructor defined for this object.).