Azure Service Bus,其中包含具有抽象主体的消息

时间:2014-08-20 12:25:49

标签: c# azureservicebus azure-sdk-.net

我使用Azure主题和订阅作为消息总线。但当我做 message.GetBody()时,我收到了一个SerializationException。我想要实现的是让一个订阅者读取BaseEvent类型的所有事件,并且每个事件都有自己的订阅者。但是,当我尝试序列化主体(BaseEvent)时,它失败了。那么如何序列化主体以获取UserEvent和TeamEvent?我的代码如下所示:

public abstract class BaseEvent
{
    public long ActivityId { get; set; }
}

public class UserEvent
{
    public string Name { get; set; }
}

public class TeamEvent
{
    public string Name { get; set; }
}

我将它们添加到消息总线中,如下所示:

public async Task HandleAsync(BaseEvent request)
{
     var message = new BrokeredMessage(request)
     {
         CorrelationId = request.Id.ToString()
     };

     await topicClient.SendAsync(message);
     await topicClient.CloseAsync();
}

当我要从公交车上阅读时,我确实喜欢这样:

BrokeredMessage message;
while ((message = client.Receive(new TimeSpan(0, 0, 5))) != null)
{
    models.Add(message.GetBody<BaseEvent>()); // THIS FAILS SerlizationException
    message.Complete();
}

1 个答案:

答案 0 :(得分:0)

作为BrokeredMessage Constructor声明:

public BrokeredMessage(
    Object serializableObject
)

它通过使用带有二进制XmlDictionaryWriter的DataContractSerializer从给定对象初始化BrokeredMessage类的新实例。因此BaseEvent类必须支持DataContractSerializer。如何操作,请参阅Serialization and Deserialization