如何在工作组安装上以编程方式清除MSMQ系统队列日志？

Question

I try this: MessageQueue mq = new MessageQueue(".\\Journal$"); mq.Purge();

It work good on XP. But, on windows 2003 server, I always have this error : "A workgroup installation computer does not support the operation."

Answer 1

The correct format for system queues:

FormatName:Direct=os:.\\System$;JOURNAL

I've tested this format on Windows 7 and Windows 2003.

(the dot after os: means the localhost/local computer)

var systemJournalQueue = new MessageQueue("FormatName:Direct=os:.\\System$;JOURNAL");
var systemDeadLetterQueue = new MessageQueue("FormatName:Direct=os:.\\System$;DEADLETTER");
var systemDeadXLetterQueue =new MessageQueue("FormatName:Direct=os:.\\System$;DEADXACT"));

systemJournalQueue.Purge();

or if you want to keep N days of messages you can do this:

private static void PurgeQueues(int archiveAfterHowManyDays, MessageQueue queue)
{
    queue.Formatter = new XmlMessageFormatter(new Type[] { typeof(System.String) });
    queue.MessageReadPropertyFilter.ArrivedTime = true;

    using (MessageEnumerator messageReader = queue.GetMessageEnumerator2())
    {
        while (messageReader.MoveNext())
        {
            Message m = messageReader.Current;
            if (m.ArrivedTime.AddDays(archiveAfterHowManyDays) < DateTime.Now)
            {
                queue.ReceiveById(m.Id);
            }
        }
    }
}

Answer 2

Try using format name like so:

MessageQueue mq = new MessageQueue("DIRECT=OS:computername\SYSTEM$;JOURNAL");
mq.Purge();

I think that system queue can't be access by path. You have to use format name.

look at Yoel Arnon's comment at the bottom of the page.