C＃Rabbitmq序列化消息并反序列化原始类型

Question

I am using Rabbitmq client to produce and consume messages. My messages is like this.

public interface IMessage{}

public class PlaceOrder: IMessage{ 
  public string id{ get; set; }
}    

I have two c# console applicaiton projects. One of them Producer and other is Consumer .

Producer console applicaiton

public class Producer{
    public void Save(IMessage message){
        ....
        var serializedObject = JsonConvert.SerializeObject(message);
        ....
        // append queue serializedObject 
    }
}

Consumer console applicaiton

public class Consumer{
    public void HandleBasicDeliver(string consumerTag, ulong deliveryTag, bool redelivered, string exchange, string routingKey, IBasicProperties properties, byte[] body){
        ....
        var message = JsonConvert.DeserializeObject(Encoding.UTF8.GetString(body));
        ....

    }
}

Here message type is Object. And consumer console applicaiton does not knows PlaceOrder type. It only knows IMessage interface type. How can I cast or convert original type.

Answer 1

Look at the options in NewtonSoft.Json's TypeNameHandling enumeration . Set this on a JsonSerializerSettings and pass it into your calls to De/SerializeObject() .

You may also want to evaluate EasyNetQ , which is specifically geared to this approach out-of-box, and adds other functionality.

Note there can be some disadvantages (architecturally) to insisting that message producers and consumers always use identically-named types with identical message structures. You can end up tightly coupling all producers and consumers, such that all must be deployed in lock-step when a message format changes (as opposed to adopting a Tolerant Reader approach, which can allow for more loosely-coupled evolution of producers and consumers). Depends on your project goals, but an aspect to consider.