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 FilesMicrosoft Visual Studio .NETFrameworkSDKBinildasm.exe（可使用Visual Studio .Net 2003 命令提示),
格式如下：tlbimp c:Program FilesDimacw3JMail4jmail.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 += "rnrn";
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 + "rnrn" + 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）