目前,我正在使用寡妇服务,该服务正在从本地专用MSMQ接收消息。队列是事务性的。
接收是这样完成的:
public void ReceiveAndSaveData(MessageQueue queue, MsmqDbContext context)
{
var message = new Message();
try
{
using (var tx = new MessageQueueTransaction())
{
tx.Begin();
message = queue.Receive(tx);
var bodyReader = new StreamReader(message.BodyStream);
var jsonBody = bodyReader.ReadToEnd();
var messageData = JsonConvert.DeserializeObject<QueueMessage>(jsonBody);
/*THERE IS SOME DATA PROCESSING*/
tx.Commit();
}
}
catch (JsonSerializationException e)
{
Logger.WriteError(new LogDetail("Error occured during deserializing incoming data.", e, message.Id));
}
catch (Exception e)
{
Logger.WriteError(new LogDetail("Error occured during saving data to database", e, message.Id));
}
}
如果发生JsonSerializationException,我想从当前队列中删除此消息。有人知道如何解决这个问题吗?
使用Abort()
方法,还将创建tx对象移到try-catch块之外。
public void ReceiveAndSaveData(MessageQueue queue, MsmqDbContext context)
{
var message = new Message();
MessageQueueTransaction tx;
try
{
using (tx = new MessageQueueTransaction())
{
tx.Begin();
message = queue.Receive(tx);
var bodyReader = new StreamReader(message.BodyStream);
var jsonBody = bodyReader.ReadToEnd();
var messageData = JsonConvert.DeserializeObject<QueueMessage>(jsonBody);
/*THERE IS SOME DATA PROCESSING*/
}
}
catch (JsonSerializationException e)
{
Logger.WriteError(new LogDetail("Error occured during deserializing incoming data.", e, message.Id));
tx.Abort(); //Rolls back the pending internal transaction
}
catch (Exception e)
{
Logger.WriteError(new LogDetail("Error occured during saving data to database", e, message.Id));
}
finally
{
tx.Commit();
}
}
将tx.Commit()
也放入catch
的JsonSerializationException
块内