/// <summary>
    /// Message Interface
    /// Author:Garrett
    /// </summary>
    public interface IMessageManager
    {
        /// <summary>
        /// Sends a message to a channel using a content item as the recipient
        /// </summary>
        /// <param name="recipient">A content item to send the message to.</param>
        /// <param name="type">A custom string specifying what type of message is sent. Used in even handlers to define the message.</param>
        /// <param name="service">The name of the channel to use, e.g. "email"</param>
        /// <param name="properties">A set of specific properties for the channel.</param>
        void Send(string recipient, MessageType type, string subject, string body);

        /// <summary>
        /// Sends a message to a channel using a set of content items as the recipients
        /// </summary>
        /// <param name="recipients">A set of content items to send the message to. Only one message may be sent if the channel manages it.</param>
        /// <param name="type">A custom string specifying what type of message is sent. Used in even handlers to define the message.</param>
        /// <param name="service">The name of the channel to use, e.g. "email"</param>
        /// <param name="properties">A set of specific properties for the channel.</param>
        void Send(IEnumerable<string> recipients, MessageType type, string subject, string body);

        /// <summary>
        /// Async Sends a message to a channel using a set of content items as the recipients
        /// </summary>
        /// <param name="recipients">A set of content items to send the message to. Only one message may be sent if the channel manages it.</param>
        /// <param name="type">A custom string specifying what type of message is sent. Used in even handlers to define the message.</param>
        /// <param name="service">The name of the channel to use, e.g. "email"</param>
        /// <param name="properties">A set of specific properties for the channel.</param>
        /// <param name="isAsync">is Async</param>
        void Send(IEnumerable<string> recipients, MessageType type, string subject, string body, bool isAsync);


    }

/// <summary>
    /// 默認發消息服(fu)務
    /// </summary>
    public class EmailMessageManager : IMessageManager
    {

        #region Delegate & Event
        /// <summary>
        /// 加入發送(song)隊(dui)列(lie)中
        /// </summary>
        /// <param name="context"></param>
        public delegate void SendingEventHandler(MessageContext context);
        /// <summary>
        /// 發送(song)消(xiao)息
        /// </summary>
        /// <param name="context"></param>
        public delegate void SentEventHandler(MessageContext context);
        /// <summary>
        /// 加入發(fa)送隊列中
        /// </summary>
        public event SendingEventHandler Sending;
        /// <summary>
        /// 發(fa)送(song)消息
        /// </summary>
        public event SentEventHandler Sent;

        void OnSending(MessageContext context)
        {
            if (Sending != null)
                Sending(context);
        }
        void OnSent(MessageContext context)
        {
            if (Sent != null)
                Sent(context);
        }
        #endregion

        #region IMessageManager 成員

        public void Send(string recipient, MessageType type, string subject, string body)
        {
            Send(new List<string> { recipient }, type, subject, body);
        }

        public void Send(IEnumerable<string> recipients, MessageType type, string subject, string body)
        {
            Send(recipients, type, subject, body, false);
        }

        public void Send(IEnumerable<string> recipients, MessageType type, string subject, string body, bool isAsync)
        {
            if (recipients != null && recipients.Any())
            {
                using (SmtpClient client = new SmtpClient()
                {
                    Host = MessageManager.Instance.Host,
                    Port = MessageManager.Instance.Port,
                    Credentials = new NetworkCredential(MessageManager.Instance.UserName, MessageManager.Instance.Password),
                    EnableSsl = false,//設置為(wei)true會出(chu)現"服務器不(bu)支持安全連接(jie)的(de)錯誤"
                    DeliveryMethod = SmtpDeliveryMethod.Network,
                })
                {
                    #region Send Message
                    var mail = new MailMessage
                    {
                        From = new MailAddress(MessageManager.Instance.Address, MessageManager.Instance.DisplayName),
                        Subject = subject,
                        Body = body,
                        IsBodyHtml = true,
                    };
                    MailAddressCollection mailAddressCollection = new MailAddressCollection();
                    recipients.ToList().ForEach(i =>
                    {
                        mail.To.Add(i);
                    });
                    if (isAsync)
                    {
                        client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);
                        client.SendAsync(mail, recipients);
                    }
                    else
                    {
                        client.Send(mail);
                    }
                    #endregion
                }
            }
        }

        void client_SendCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
        {
            string arr = null;
            (e.UserState as List<string>).ToList().ForEach(i => { arr += i; });
            //發送完成(cheng)后要做的事件，可能(neng)是寫日志
        }

        #endregion
    }

/// <summary>
    /// 消息實體
    /// </summary>
    public class MessageContext
    {
        /// <summary>
        /// 消息類型
        /// </summary>
        public MessageType Type { get; set; }
        /// <summary>
        /// 消息頭(tou)
        /// </summary>
        public string Subject { get; set; }
        /// <summary>
        /// 消息正文
        /// </summary>
        public string Body { get; set; }
        /// <summary>
        /// 接受方地址(zhi)列表(biao)
        /// </summary>
        public IEnumerable<string> Addresses { get; set; }
        /// <summary>
        /// 是否處于準(zhun)備發(fa)送狀態
        /// </summary>
        public bool MessagePrepared { get; set; }

        public MessageContext()
        {
            Addresses = Enumerable.Empty<string>();
        }
    }

    /// <summary>
    /// Message塊(kuai)，在web.config中提供Message塊(kuai)定義(yi)
    /// </summary>
    internal class MessageSection : ConfigurationSection
    {
        /// <summary>
        /// 賬號
        /// </summary>
        [ConfigurationProperty("UserName", DefaultValue = "bfyxzls")]
        public string UserName
        {
            get { return (string)this["UserName"]; }
            set { this["UserName"] = value; }
        }
        /// <summary>
        /// 密碼
        /// </summary>
        [ConfigurationProperty("Password", DefaultValue = "gemini123")]
        public string Password
        {
            get { return (string)this["Password"]; }
            set { this["Password"] = value; }
        }
        /// <summary>
        /// 郵件服務器地址
        /// </summary>
        [ConfigurationProperty("Host", DefaultValue = "smtp.sina.com")]
        public string Host
        {
            get { return (string)this["Host"]; }
            set { this["Host"] = value; }
        }
        /// <summary>
        /// 端(duan)口號
        /// </summary>
        [ConfigurationProperty("Port", DefaultValue = "25")]
        public int Port
        {
            get { return (int)this["Port"]; }
            set { this["Port"] = value; }
        }
        /// <summary>
        /// 發件人的email地址
        /// </summary>
        [ConfigurationProperty("Address", DefaultValue = "bfyxzls@sina.com")]
        public string Address
        {
            get { return (string)this["Address"]; }
            set { this["Address"] = value; }
        }
        /// <summary>
        /// 發送(song)之后，在收件(jian)人(ren)端顯示的名稱
        /// </summary>
        [ConfigurationProperty("DisplayName", DefaultValue = "占(zhan)占(zhan)")]
        public string DisplayName
        {
            get { return (string)this["DisplayName"]; }
            set { this["DisplayName"] = value; }
        }

    }

<configuration>
  <configSections>
    <section name="MessageSection" type="Messaging.MessageSection"/>
  </configSections>
  <MessageSection UserName="853066980" Password="gemini123" Host="smtp.qq.com" Port="25" Address="853066980@qq.com" DisplayName="大占(zhan)"></MessageSection>
</configuration>

    /// <summary>
    /// 消(xiao)息類型(xing)
    /// </summary>
    public enum MessageType
    {
        /// <summary>
        /// 電子郵件(jian)
        /// </summary>
        Email,
        /// <summary>
        /// 短(duan)信(xin)息(xi)
        /// </summary>
        ShortMessage,

    }

    /// <summary>
    /// 消息生產者
    /// </summary>
    public class MessageFactory
    {
        /// <summary>
        /// 消息對象(xiang)
        /// </summary>
        public static IMessageManager Instance
        {
            get
            {
                MessageType messageType = MessageType.Email;//通過配置產生
                switch (messageType)
                {
                    case MessageType.Email:
                        return new EmailMessageManager();
                    case MessageType.ShortMessage:
                        throw new NotImplementedException("沒實現(xian)呢，呵呵");
                    default:
                        throw new ArgumentException("您(nin)輸入的參數有(you)誤");
                }
            }
        }
    }