MessageQueue的使用方法(二)

在对远程的MSMQ访问的时候，发现一个奇怪的现象

static string path = @"FormatName:DIRECT=TCP:sha-db\private$\mt1";

//check is existed and create
           if (MessageQueue.Exists(path) == false)
           {
               MessageQueue.Create(path,false);
           }

就如下代码，会报错，队列路径非法类似的错误，google了很多，都没有个解决方法。后来查到篇个回帖

http://stackoverflow.com/questions/1914885/cannot-determine-whether-a-queue-with-the-specified-format-name-exists

说 MessageQueue.Exists 文档中说：Exists方法不支持FormatName 前缀。Exists 方法不能验证远程队列。参考：http://msdn.microsoft.com/zh-cn/library/system.messaging.messagequeue.exists.aspx

文中还提供了其他可以实现的方法。 

虽然Exists方法会失败，但是不影响它发送消息，只要路径写对，照样可以发送出去。

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还有一个奇怪的现象。

使用for语句插入2000条消息，在消息队列的窗口最多只能看到1000条，当你取出一条后，才能看到后一条。

估计是设计使然。

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下面的方法是一些示例代码，主要是多线程发消息和去消息

////////////////多线程

//watch.Restart();
           //Thread t1 = new Thread(send);
           //Thread t2 = new Thread(send);
           //Thread t3 = new Thread(send);
           //Thread t4 = new Thread(send);
           //t1.Start();
           //t2.Start();
           //t3.Start();
           //t4.Start();

           //t4.Join();
           //t1.Join();
           //t2.Join();
           //t3.Join();
           //t4.Join();
           //watch.Stop();
           //SaveFile(@"c:\msmqlog.txt", "多线程发送" + j + "条消息,每条大小约40k，时间：" + watch.Elapsed.ToString());

 

////////委托异步执行

           // Action a = new Action(() =>
           // {
           //     for (int i = 0; i < 5000; i++)
           //     {
           //         Console.WriteLine(i);
           //         queue.Send(s, transactionType);
           //     }
           //     queue.Close();
           // });

           //watch.Restart();
           //IAsyncResult ia= a.BeginInvoke((ar) => {
           //     SaveFile(@"c:\msmqlog.txt", "异步发送" + j + "条消息,每条大小约40k，时间：" + watch.Elapsed.ToString());
           // }, null);
           // a.EndInvoke(ia);

   ////////同步的读取消息

           //int index = 0;
           //MessageEnumerator me = queue.GetMessageEnumerator2();
           //watch.Restart();
           //while (me.MoveNext())
           //{
           //    Console.Write(me.Current.Id + "-");
           //    Console.WriteLine(++index);
           //    me.RemoveCurrent();
           //    me.Reset();
           //}
           //watch.Stop();
           //SaveFile(@"c:\msmqlog.txt", "删除" + index + "条消息,每条大小约40k，时间：" + watch.Elapsed.ToString());

 

////////多线程读取消息

           Thread t1 = new Thread(() =&gt; receive("1"));//使用拉姆达表达式往线程中传参数
           Thread t2 = new Thread(() =&gt; receive("2"));
           Thread t3 = new Thread(() =&gt; receive("3"));
           Thread t4 = new Thread(() =&gt; receive("4"));

           t1.Start();
           t2.Start();
           t3.Start();
           t4.Start();

           t1.Join();
           t2.Join();
           t3.Join();
           t4.Join();

           Console.WriteLine();
       }

 

//GetMessageEnumerator2()方式取消息，

//在并发情况下，可能游标所指定的消息被其他线程删除，抛异常。

       static public void GetMessage(string i)
       {
           MessageQueue queue = new System.Messaging.MessageQueue(path);
           MessageEnumerator me = queue.GetMessageEnumerator2();
           int index = 0;
           while (me.MoveNext())
           {
               try
               {
                   Console.Write(me.Current.Id + "-");
                   Console.WriteLine(++index);
                   string s = me.Current.Id + "-";
                   SaveFile(@"c:\" + i + ".txt", s + index);
                   me.RemoveCurrent();
                   me.Reset();
               }
               catch (Exception ex)
               {
                   SaveFile(@"c:\" + i + ".txt", ex.Message);
               }
           }
       }

//Receive方式取消息

       static public void receive(string i)
       {
           MessageQueue queue = new System.Messaging.MessageQueue(path);

           while (true)
           {
               try
               {
                   Message me= queue.Receive(new TimeSpan(0,0,1));
                   me.Formatter = new System.Messaging.XmlMessageFormatter((new Type[] { typeof(string) }));
                   Console.WriteLine(me.Id + "-");
                   SaveFile(@"c:\" + i + ".txt", me.Id);
               }
               catch (MessageQueueException ex1)
               {
                   if (ex1.MessageQueueErrorCode == MessageQueueErrorCode.IOTimeout)
                   {
                       Console.WriteLine("MessageQueueErrorCode.IOTimeout");
                       SaveFile(@"c:\" + i + ".txt", "MessageQueueErrorCode.IOTimeout");
                       Thread.Sleep(5000);
                   }
               }
               catch (Exception ex)
               {
                   Console.WriteLine(ex.Message);
                   SaveFile(@"c:\" + i + ".txt", ex.Message);
               }
           }
       }

       static public void send()
       {
           string s = ReadFile(@"c:\pp.txt");
           MessageQueueTransactionType transactionType = MessageQueueTransactionType.None;
           MessageQueue queue = new System.Messaging.MessageQueue(path);
           //int j = 10000;
           for (int i = 0; i &lt; 1250; i++)
           {
               Console.WriteLine(i);
               queue.Send(s, transactionType);
           }
           queue.Close();
       }