C＃Ninject-绑定工厂方法和泛型

Question

I have a factory method called MessageHandlerFactory

public class MessageHandlerFactory : IMessageHandlerFactory<IMessage>
{
    public IMessageHandler<IMessage> GetMessageHandler()
    {
        return new MessageHandler_1();
    }
}    

... and the following message Handler

public class MessageHandler_1 : IMessageHandler<Message>
{
    //Do Something…
}

public class Message : IMessage
{
    public String Name {get; set;}
}

MessageHandlerFactory needs to be assigned to all occurrences of IMessageHandlerFactory in my project so that calls to IMessageHandlerFactory.GetMessageHandler() will return an instance of MessageHandler_1 . (In my actual code, I have multiple implementations of IMessageHandler and IMessageHandlerFactory.GetMessageHandler would return an appropriate implementation based on some conditions...). Here is how I do my Ninject binding

Bind<IMessageHandlerFactory<IMessage>>().To<MessageHandlerFactory>();
Bind<IMessageHandler<Message>>().To<MessageHandler_1>();

But when I try accessing the MessageHandlerFactory.GetMessageHandler, I get the following exception

Ninject.ActivationException: Error activating IMessageHandler{IMessage} No matching bindings are available, and the type is not self-bindable. Activation path: 1) Request for IMessageHandler{IMessage}

Wondering how I could fix it? I have been playing with this for quite sometime without any success. Any help would be greatly appreciated!!

Answer 1

Your exception message implies that you are attempting to resolve an "IMessageHandler< IMessage >", and there is no matching binding. The closest you have is a binding for "IMessageHandler< Message >" (note the missing "I"). I'm guessing that's where you're running into a problem.