C# 使用 Windows 消息队列机制

 

保存消息队列数据的本地磁盘地址：C:\WINDOWS\system32\msmq\storage

注意：

   1，要使用 windows 消息队列机制，必须在该 windows 操作系统中先安装“ windows 消息队列” 组件（从操作系统光盘中） ；

   2，要使用启用消息队列，必须先启动“Messenger”服务（传输客户端和服务器之间的 NET SEND 和 Alerter 服务消息。此服务与 Windows Messenger 无关。如果服务停止，Alerter 消息不会被传输。如果服务被禁用，任何直接依赖于此服务的服务将无法启动。）；

 

控件：

        private System.Windows.Forms.Button btnSendMessage;

        private System.Windows.Forms.Button btnEnumerateMessages;

        private System.Windows.Forms.TextBox txtMessages;

        private System.Windows.Forms.Button btnRemoveMessages;

        private System.Windows.Forms.Button btnSendHighestPriorityMessage;

代码：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Messaging;

using System.Xml.Serialization;



namespace MessageQueuingExample

{

    public partial class Form1 : Form

    {

        //The . in the queueName represents localhost

        private const string queueName = ".\\Private$\\Liuq";

        //private const string queueName = "A405\\Private$\\Liuq";



        //We need this class-wide to access it in the methods.

        MessageQueue queue = null;



        public Form1()

        {

            InitializeComponent();

        }



        private void Form1_Load(object sender, EventArgs e)

        {

            //Create the queue if it doesn't exist.

            CreateQueue();

        }



        private void CreateQueue()

        {

            //Does the queue already exist??

            if (MessageQueue.Exists(queueName))

                //Yes, it's already there.

                queue = new MessageQueue(queueName);

            else

                //No, we need to create it.

                queue = MessageQueue.Create(queueName, false);

        }



        private void btnSendMessage_Click(object sender, EventArgs e)

        {

            //Instantiate our MessageContent object.

            MessageContent message = new MessageContent("Hello world!");



            //Send it to the queue.

            queue.Send(message, "Sample Message");



            MessageBox.Show("Message sent.", "MSMQ");

        }



        private void btnEnumerateMessages_Click(object sender, EventArgs e)

        {

            //Clear the textbox.

            this.txtMessages.Clear();



            //Get all messages on the queue.

            System.Messaging.Message[] messages = queue.GetAllMessages();



            //Loop through the messages.

            foreach (System.Messaging.Message message in messages)

            {

                //Set the formatter for the message.

                message.Formatter = new System.Messaging.XmlMessageFormatter(new Type[1] { typeof(MessageContent) });



                //Get the MessageContent object out of the message.

                MessageContent content = (MessageContent)message.Body;



                //Update the textbox.

                this.txtMessages.Text += content.MessageText + " - " + content.CreationDate.ToString() + "\r\n";

            }

        }



        private void btnRemoveMessages_Click(object sender, EventArgs e)

        {

            //Purge all messages from the queue.

            queue.Purge();



            MessageBox.Show("Messages purged", "MSMQ");

        }



        private void btnSendHighestPriorityMessage_Click(object sender, EventArgs e)

        {

            //Create a XmlSerializer for the object type we're sending.

            XmlSerializer serializer = new XmlSerializer(typeof(MessageContent));



            //Instantiate a new message.

            System.Messaging.Message queueMessage = new System.Messaging.Message();



            //Set the priority to Highest.

            queueMessage.Priority = MessagePriority.Highest;



            //Create our MessageContent object.

            MessageContent messageContent = new MessageContent("Hello world - IMPORTANT!");



            //Serialize the MessageContent object into the queueMessage.

            serializer.Serialize(queueMessage.BodyStream, messageContent);



            //Send the message.

            queue.Send(queueMessage, "HIGH PRIORITY");



            MessageBox.Show("Important message sent.", "MSMQ");

        }

    }

}