Question

I have an interface named IListener. Now I want to create a class that receives to instances of that interface.

public Controller(IListener listener1, IListener listener2)
{ ... }

The implementation of IListener needs a port. How can I determine the parameter name in the binding of IListener so I can choose my appropriate port? I think the callback could look like:

    public Kernel()
    {
        Bind<IListener>()
            .To<SyncUdpListener>()
            .WithConstructorArgument("port", GetListenerPort);
    }

    private object GetListenerPort(IContext context, ITarget target)
    {
        var command = this.Get<Command>();

        switch (...)
        {
            case "videoListener":
                return command.VideoPort;
            case "audioListener":
                return command.AudioPort;
        }

        throw new Exception();
    }

Where I need to fill in the parameter name in the switch statement.

Thanks in advance!

Answer 1

I`m not 100% percent sure what you want to achieve here. But if your controller looks like:

public Controller(IListener videoListener, IListener audioListener)
{ ... }

And with the following code:

private object GetListenerPort(IContext context, ITarget target)
{
    var command = this.Get<Command>();

    switch (context.Request.Target.Name)
    {
        case "videoListener":
            return command.VideoPort;
        case "audioListener":
            return command.AudioPort;
    }

    throw new Exception();
}

You will get a controller with two IListener instance with the VideoPort, and AudioPort parameters. And maybe you have to make sure that the Request.Target.Type is the right controller type.