DI with Unity when multiple instances of the same type is needed

Question

I need help with this. I\'m using Unity as my container and I want to inject two different instances of the same type into my constructor.

class Example
{
           


        

Answer 1

You could register the two instances with names:

myContainer.RegisterInstance("ReceiveQueue", myReceiveMessageQueue);
myContainer.RegisterInstance("SendQueue", mySendMessageQueue);

and then you should be able to resolve by name, but it requires using the Dependency attribute:

class Example
{
    Example([Dependency("ReceiveQueue")] IQueue receiveQueue, 
            [Dependency("SendQueue")] IQueue sendQueue) {
   }
}

or inject the unity container and then resolve the instances within the constructor:

class Example
{
    Example(IUnityContainter container) 
    {
        _receiveQueue = container.Resolve("ReceiveQueue");
        _sendQueue = container.Resolve("SendQueue");
    }
}