.NET 1.1 下不使用 System.Web.Mail.SmtpMail 发送邮件的其它选择

    最近工作原因需要维护 ASP.NET 1.1 的程序，本来用着 C# 2.0 System.Net.Mail namespace 发送邮件用得好好得，但 ASP.NET 1.1 里面的 System.Web.Mail 死活问题就是多，于是选择其它策略，封装了邮件发送的接口，再以其它方式来实现邮件发送，于是就有了下面这些文字。

定义抽象接口以封装所有实现：

using System;
using System.Web.Mail;

namespace YywMail
{
    public abstract class MySmtpMail
    {
        Fields#region Fields

        private string _defaultCharset = "GB2312";
        private int _defaultSmtpPort = 25;

        #endregion
       
        Properties#region Properties

        protected string DefaultCharset
        {
            get { return this._defaultCharset; }
        }

        protected int DefaultSmtpPort
        {
            get { return this._defaultSmtpPort;}
        }

        #endregion

        Methods#region Methods

        /**//// <summary>
        /// 获取默认实例
        /// </summary>
        /// <returns></returns>
        public static MySmtpMail GetDefaultInstance()
        {
            // 此处可通过外部配置文件定义具体实现类型,再
            // 通过 Activator.CreateInstance() 获取类型实例           
        }

        /**//// <summary>
        /// 做一些初始化的工作
        /// </summary>
        public abstract void Open();

        /**//// <summary>
        /// 销毁对象
        /// </summary>
        public abstract void Close();

        /**//// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="message"></param>
        /// <param name="smtpServer"></param>
        /// <param name="serverUsername"></param>
        /// <param name="serverPassword"></param>
        /// <returns></returns>
        public bool Send(MailMessage message, string smtpServer, string serverUsername, string serverPassword)
        {
            return Send(message, smtpServer, serverUsername, serverPassword, this._defaultSmtpPort);
        }

        public abstract bool Send(MailMessage message, string smtpServer, string serverUsername, string serverPassword, int smtpPort);

        public static string[] GetTo(MailMessage message)
        {
            if (message == null)
                throw new ArgumentNullException("message");

            if (Globals.IsNullorEmpty(message.To))
                return null;

            return message.To.Split(';');
        }

        public static string[] GetCc(MailMessage message)
        {
            if (message == null)
                throw new ArgumentNullException("message");

            if (Globals.IsNullorEmpty(message.Cc))
                return null;

            return message.Cc.Split(';');
        }

        public static string[] GetBcc(MailMessage message)
        {
            if (message == null)
                throw new ArgumentNullException("message");

            if (Globals.IsNullorEmpty(message.Bcc))
                return null;

            return message.Bcc.Split(';');
        }

        #endregion
    }
}

注: 按照常理，使用前先 Open() 一下，使用后也别忘了 Close()

实现方案一（Jmail 组件）：

在 .NET 中使用 Jmail  需要如下设置：
1、安装jmail；
2、找到jmail.dll；
3、注册该组件Jmail.dll，作法是将jmail.dll文件拷贝到system32目录下，再运行命令“regsvr32 jmail.dll”（不包括引号），卸载可运行“regsvr32 /u jmail.dll”；
4、执行Program Files\Microsoft Visual Studio .NET\FrameworkSDK\Bin\ildasm.exe（可使用Visual Studio .Net 2003 命令提示),
格式如下：tlbimp c:\Program Files\Dimac\w3JMail4\jmail.dll /out:MyJmail.dll /namespace:MyJmail
生成MyJmail.dll后，将它引用至项目中。

下载组件

接下来就是实现类的编写了：

using System;
using System.Web.Mail;

namespace YywMail
{
    public class JMailSmtpMail : MySmtpMail
    {
        Fields#region Fields

        MyJmail.Message jmail = null;

        #endregion

        Methods#region Methods

        public override void Open()
        {
            jmail = new MyJmail.Message();
        }

        public override bool Send(MailMessage message, string smtpServer, string serverUsername, string serverPassword, int smtpPort)
        {
            if (jmail == null)
                throw new Exception("smtp is Closed!");
           
            if (message == null)
                throw new ArgumentNullException("message");

            DateTime t = DateTime.Now;

            //Silent属性：如果设置为true,JMail不会抛出例外错误. JMail. Send( () 会根据操作结果返回true或false
            jmail.Silent = false;

            //jmail创建的日志，前提loging属性设置为true
            jmail.Logging = true;

            //字符集，缺省为"US-ASCII"
            jmail.Charset = base.DefaultCharset;

            //信件的contentype. 缺省是"text/plain"） : 字符串如果你以HTML格式发送邮件, 改为"text/html"即可。
            if (message.BodyFormat == MailFormat.Html)
                jmail.ContentType = "text/html";

           
            jmail.Priority = GetJmailPriority(message.Priority);

            //添加收件人
            string[] toArray = MySmtpMail.GetTo(message);
            if (toArray != null && toArray.Length > 0)
            {
                bool isAddedRecipient = false;

                for (int i = 0; i < toArray.Length; i++)
                {
                    if (Globals.IsNullorEmpty(toArray[i]))
                        continue;

                    if (!isAddedRecipient)
                    {
                        jmail.AddRecipient(toArray[i], String.Empty, String.Empty);
                        isAddedRecipient = true;
                    }
                    else
                    {
                        jmail.AddRecipientCC(toArray[i], String.Empty, String.Empty);
                    }
                }
            }

            string[] ccArray = MySmtpMail.GetCc(message);
            if (ccArray != null)
            {
                foreach (string cc in ccArray)
                {
                    if (!Globals.IsNullorEmpty(cc))
                        jmail.AddRecipientCC(cc, String.Empty, String.Empty);
                }
            }

            string[] bccArray = MySmtpMail.GetBcc(message);
            if (ccArray != null)
            {
                foreach (string bcc in bccArray)
                {
                    if (!Globals.IsNullorEmpty(bcc))
                        jmail.AddRecipientBCC(bcc, String.Empty);
                }
            }

            jmail.From = message.From;           

            //发件人邮件用户名
            jmail.MailServerUserName = serverUsername;
            //发件人邮件密码
            jmail.MailServerPassWord = serverPassword;           
            //设置邮件标题
            jmail.Subject = message.Subject;
            //邮件添加附件,(多附件的话，可以再加一条jmail.AddAttachment( "c:\\test.jpg",true,null);)就可以搞定了。［注］：加了附件，讲把上面的jmail.ContentType="text/html";删掉。否则会在邮件里出现乱码。
            //jmail.AddAttachment("c:\\test.jpg", true, null);
            //邮件内容
            jmail.Body = message.Body;

            if (message.BodyFormat == MailFormat.Html)
                jmail.Body += "<br><br>";
            else
                jmail.Body += "\r\n\r\n";

            jmail.Body += DateTime.Now.ToString();

            smtpServer = String.Format("{0}:{1}", smtpServer, smtpPort);

            //jmail发送的方法
            bool result = jmail.Send(smtpServer, false);

            return result;
        }

        public override void Close()
        {
            jmail.Close();
        }

        private static byte GetJmailPriority( System.Web.Mail.MailPriority priority)
        {
            // 邮件等级，1为加急，3为普通，5为低级

            if (priority == System.Web.Mail.MailPriority.High)
                return 1;

            if (priority == System.Web.Mail.MailPriority.Low)
                return 5;

            return 3;
        }

        #endregion
    }
}

实现方案二（OpenSmtp.Net 组件）：

对于还没有接触过 OpenSmtp.Net 的朋友可以先 Google 下，这里不再做概念介绍，同时它还有一个孪生兄弟 OpenPop.Net，至于 OpenSmtp.Net 我们可以在 http://sourceforge.net/projects/opensmtp-net/ 下载到，目前最新版本是 1.11。

接下来开始进入主题：

using System;
using System.Web.Mail;
using OpenSmtp.Mail;

namespace YywMail
{
    public class OpenSmtpMail : MySmtpMail
    {
        Files#region Files

        OpenSmtp.Mail.MailMessage msg = null;
        Smtp smtp = null;

        #endregion

        Methods#region Methods

        public override void Open()
        {
            msg = new OpenSmtp.Mail.MailMessage();
            smtp = new Smtp();
        }

        public override bool Send(System.Web.Mail.MailMessage message, string smtpServer, string serverUsername, string serverPassword, int smtpPort)
        {
            if (msg == null || smtp == null)
                throw new Exception("smtp is Closed!");

            if (message == null)
                throw new ArgumentNullException("message");

            SmtpConfig.VerifyAddresses = false;
            EmailAddress from = new EmailAddress(message.From, message.From);
           
            msg.Charset = base.DefaultCharset;

            msg.From = from;
            msg.Priority = GetOpenSmtpPriority(message.Priority);

            //添加收件人
            string[] toArray = MySmtpMail.GetTo(message);
            if (toArray != null)
            {
                foreach (string to in toArray)
                {
                    if (!Globals.IsNullorEmpty(to))
                        msg.AddRecipient(to, AddressType.To);
                }
            }

            string[] ccArray = MySmtpMail.GetCc(message);
            if (ccArray != null)
            {
                foreach (string cc in ccArray)
                {
                    if (!Globals.IsNullorEmpty(cc))
                        msg.AddRecipient(cc, AddressType.Cc);
                }
            }

            string[] bccArray = MySmtpMail.GetBcc(message);
            if (ccArray != null)
            {
                foreach (string bcc in bccArray)
                {
                    if (!Globals.IsNullorEmpty(bcc))
                        msg.AddRecipient(bcc, AddressType.Bcc);
                }
            }

            msg.Subject = message.Subject;

            if (message.BodyFormat == System.Web.Mail.MailFormat.Html)
            {
                msg.HtmlBody = message.Body + "<br><br>" + DateTime.Now.ToString();
            }
            else
            {
                msg.Body = message.Body + "\r\n\r\n" + DateTime.Now.ToString();;
            }

            string str1 = msg.HtmlBody;
            string str2 = msg.Body;
           
            smtp.Host = smtpServer;
            smtp.Username = serverUsername;
            smtp.Password = serverPassword;
            smtp.Port = smtpPort;

            smtp.SendMail(msg);

            return true;
        }   
   
        public override void Close()
        {
            msg = null;
            smtp = null;
        }

        private static string GetOpenSmtpPriority( System.Web.Mail.MailPriority priority)
        {
            // 邮件等级，1为加急，3为普通，5为低级

            if (priority == System.Web.Mail.MailPriority.High)
                return OpenSmtp.Mail.MailPriority.High;

            if (priority == System.Web.Mail.MailPriority.Low)
                return OpenSmtp.Mail.MailPriority.Low;

            return OpenSmtp.Mail.MailPriority.Normal;
        }

        #endregion
    }
}

实现方案三：

（上面两种实现方案已经足够满足目前的需求，有必要的话再继续扩展）