C# - MailSender 邮件发送组件源代码 (支持ESMTP, 附件) (转)[@more@]

//============================================================
// File: MailSender.cs
// 邮件发送组件
// 支持ESMTP, 多附件
//============================================================

namespace JcPersonal.Utility
{
 using System;
 using System.Collections;
 using System.NET.Sockets;
 using System.IO;
 using System.Text;

 ///

 /// Mail 发送器
 ///

 public class MailSender
 {
 ///

 /// SMTP服务器域名
 ///

 public string Server {
 get { return server; }
 set { if (value != server) server = value; }
 } private string server = "";

 ///

 /// SMTP服务器端口 [默认为25]
 ///

 public int Port {
 get { return port; }
 set { if (value != port) port = value; }
 } private int port = 25;

 ///

 /// 用户名 [如果需要身份验证的话]
 ///

 public string UserName {
 get { return userName; }
 set { if (value != userName) userName = value; }
 } private string userName = "";

 ///

 /// 密码 [如果需要身份验证的话]
 ///

 public string Password {
 get { return password; }
 set { if (value != password) password = value; }
 } private string password = "";

 ///

 /// 发件人地址
 ///

 public string From {
 get { return from; }
 set { if (value != from) from = value;}
 } private string from = "";

 ///

 /// 收件人地址
 ///

 public string To {
 get { return to; }
 set { if (value != to) to = value;}
 } private string to = "";

 ///

 /// 发件人姓名
 ///

 public string FromName {
 get { return fromName; }
 set { if (value != fromName) fromName = value; }
 } private string fromName = "";

 ///

 /// 收件人姓名
 ///

 public string ToName {
 get { return toName; }
 set { if (value != toName) toName = value; }
 } private string toName = "";

 ///

 /// 邮件的主题
 ///

 public string Subject {
 get { return subject; }
 set { if (value != subject) subject = value; }
 } private string subject = "";

 ///

 /// 邮件正文
 ///

 public string Body {
 get { return body; }
 set { if (value != body) body = value; }
 } private string body = "";

 ///

 /// 超文本格式的邮件正文
 ///

 public string HtmlBody {
 get { return htmlBody; }
 set { if (value != htmlBody) htmlBody = value; }
 } private string htmlBody = "";

 ///

 /// 是否是html格式的邮件
 ///

 public bool IsHtml {
 get { return isHtml; }
 set { if (value != isHtml) isHtml = value; }
 } private bool isHtml = false;

 ///

 /// 语言编码 [默认为GB2312]
 ///

 public string LanguageEncoding {
 get { return languageEncoding; }
 set { if (value != languageEncoding) languageEncoding = value; }
 } private string languageEncoding = "GB2312";

 ///

 /// 邮件编码 [默认为8bit]
 ///

 public string MailEncoding {
 get { return encoding; }
 set { if (value != encoding) encoding = value; }
 } private string encoding = "8bit";

 ///

 /// 邮件优先级 [默认为3]
 ///

 public int Priority {
 get { return priority; }
 set { if (value != priority) priority = value; }
 } private int priority = 3;

 ///

 /// 附件 [AttachmentInfo]
 ///

 public IList Attachments {
 get { return attachments; }
// set { if (value != attachments) attachments = value; }
 } private ArrayList attachments = new ArrayList ();

 ///

 /// 发送邮件
 ///

 public void sendmail ()
 {
 // 创建TcpClient对象， 并建立连接
 TcpClient tcp = null;
 try
 {
 tcp = new TcpClient (server, port);
 }
 catch (Exception)
 {
 throw new Exception ("无法连接服务器");
 }

 ReadString (tcp.GetStream());//获取连接信息

 // 开始进行服务器认证
 // 如果状态码是250则表示操作成功
 if (!Command (tcp.GetStream(), "EHLO Localhost", "250"))
 throw new Exception ("登陆阶段失败");

 if (userName != "")
 {
 // 需要身份验证
 if (!Command (tcp.GetStream(), "AUTH LOGIN", "334"))
 throw new Exception ("身份验证阶段失败");
 string nameB64 = ToBase64 (userName); // 此处将username转换为Base64码
 if (!Command (tcp.GetStream(), nameB64, "334"))
 throw new Exception ("身份验证阶段失败");
 string passB64 = ToBase64 (password); // 此处将password转换为Base64码
 if (!Command (tcp.GetStream(), passB64, "235"))
 throw new Exception ("身份验证阶段失败");
 }

 // 准备发送
 WriteString (tcp.GetStream(), "mail From: " + from);
 WriteString (tcp.GetStream(), "rcpt to: " + to);
 WriteString (tcp.GetStream(), "data");

 // 发送邮件头
 WriteString (tcp.GetStream(), "Date: " + DateTime.Now); // 时间
 WriteString (tcp.GetStream(), "From: " + fromName + "<" + from + ">"); // 发件人
 WriteString (tcp.GetStream(), "Subject: " + subject); // 主题
 WriteString (tcp.GetStream(), "To:" + toName + "<" + to + ">"); // 收件人

 //邮件格式
 WriteString (tcp.GetStream(), "Content-Type: multipart/mixed; boundary="unique-boundary-1"");
 WriteString (tcp.GetStream(), "Reply-To:" + from); // 回复地址
 WriteString (tcp.GetStream(), "X-Priority:" + priority); // 优先级
 WriteString (tcp.GetStream(), "MIME-Version:1.0"); // MIME版本

 // 数据ID,随意
// WriteString (tcp.GetStream(), "Message-Id: " + DateTime.Now.ToFileTime() + "@security.com");
 WriteString (tcp.GetStream(), "Content-Transfer-Encoding:" + encoding); // 内容编码
 WriteString (tcp.GetStream(), "X-Mailer:JcPersonal.Utility.MailSender"); // 邮件发送者
 WriteString (tcp.GetStream(), "");

 WriteString (tcp.GetStream(), ToBase64 ("This is a multi-part message in MIME format."));
 WriteString (tcp.GetStream(), "");

 // 从此处开始进行分隔输入
 WriteString (tcp.GetStream(), "--unique-boundary-1");

 // 在此处定义第二个分隔符
 WriteString (tcp.GetStream(), "Content-Type: multipart/alternative;Boundary="unique-boundary-2"");
 WriteString (tcp.GetStream(), "");

 if(!isHtml)
 {
 // 文本信息
 WriteString (tcp.GetStream(), "--unique-boundary-2");
 WriteString (tcp.GetStream(), "Content-Type: text/plain;charset=" + languageEncoding);
 WriteString (tcp.GetStream(), "Content-Transfer-Encoding:" + encoding);
 WriteString (tcp.GetStream(), "");
 WriteString (tcp.GetStream(), body);
 WriteString (tcp.GetStream(), "");//一个部分写完之后就写如空信息，分段
 WriteString (tcp.GetStream(), "--unique-boundary-2--");//分隔符的结束符号，尾巴后面多了--
 WriteString (tcp.GetStream(), "");
 }
 else
 {
 //html信息
 WriteString (tcp.GetStream(), "--unique-boundary-2");
 WriteString (tcp.GetStream(), "Content-Type: text/html;charset=" + languageEncoding);
 WriteString (tcp.GetStream(), "Content-Transfer-Encoding:" + encoding);
 WriteString (tcp.GetStream(), "");
 WriteString (tcp.GetStream(), htmlBody);
 WriteString (tcp.GetStream(), "");
 WriteString (tcp.GetStream(), "--unique-boundary-2--");//分隔符的结束符号，尾巴后面多了--
 WriteString (tcp.GetStream(), "");
 }

 // 发送附件
 // 对文件列表做循环
 for (int i = 0; i < attachments.Count; i++)
 {
 WriteString (tcp.GetStream(), "--unique-boundary-1"); // 邮件内容分隔符
 WriteString (tcp.GetStream(), "Content-Type: application/octet-stream;name="" + ((AttachmentInfo)attachments[i]).FileName + """); // 文件格式
 WriteString (tcp.GetStream(), "Content-Transfer-Encoding: base64"); // 内容的编码
 WriteString (tcp.GetStream(), "Content-Disposition:attachment;filename="" + ((AttachmentInfo)attachments[i]).FileName + """); // 文件名
 WriteString (tcp.GetStream(), "");
 WriteString (tcp.GetStream(), ((AttachmentInfo)attachments[i]).Bytes); // 写入文件的内容
 WriteString (tcp.GetStream(), "");
 }

 Command (tcp.GetStream(), ".", "250"); // 最后写完了，输入"."

 // 关闭连接
 tcp.Close ();
 }

 ///

 /// 向流中写入字符
 ///

 /// 来自TcpClient的流
 /// 写入的字符
 protected void WriteString .networkStream netStream, string str)
 {
 str = str + " "; // 加入换行符

 // 将命令行转化为byte[]
 byte[] bWrite = Encoding.GetEncoding(languageEncoding).GetBytes(str.ToCharArray());

 // 由于每次写入的数据大小是有限制的，那么我们将每次写入的数据长度定在７５个字节，一旦命令长度超过了７５，就分步写入。
 int start=0;
 int length=bWrite.Length;
 int page=0;
 int size=75;
 int count=size;
 try
 {
 if (length>75)
 {
 // 数据分页
 if ((length/size)*size page=length/size+1;
 else
 page=length/size;
 for (int i=0;i {
 start=i*size;
 if (i==page-1)
 count=length-(i*size);
 netStream.Write(bWrite,start,count);// 将数据写入到服务器上
 }
 }
 else
 netStream.Write(bWrite,0,bWrite.Length);
 }
 catch(Exception)
 {
 // 忽略错误
 }
 }

 ///

 /// 从流中读取字符
 ///

 /// 来自TcpClient的流
 /// 读取的字符
 protected string ReadString (NetworkStream netStream)
 {
 string sp = null;
 byte[] by = new byte[1024];
 int size = netStream.Read(by,0,by.Length);// 读取数据流
 if (size > 0)
 {
 sp = Encoding.Default.GetString(by);// 转化为String
 }
 return sp;
 }

 ///

 /// 发出命令并判断返回信息是否正确
 ///

 /// 来自TcpClient的流
 /// 命令
 /// 正确的状态码
 /// 是否正确
 protected bool Command (NetworkStream netStream, string command, string state)
 {
 string sp=null;
 bool success=false;
 try
 {
 WriteString (netStream, command);// 写入命令
 sp = ReadString (netStream);// 接受返回信息
 if (sp.IndexOf(state) != -1)// 判断状态码是否正确
 success=true;
 }
 catch(Exception)
 {
 // 忽略错误
 }
 return success;
 }

 ///

 /// 字符串编码为Base64
 ///

 /// 字符串
 /// Base64编码的字符串
 protected string ToBase64 (string str)
 {
 try
 {
 byte[] by = Encoding.Default.GetBytes (str.ToCharArray());
 str = Convert.ToBase64String (by);
 }
 catch(Exception)
 {
 // 忽略错误
 }
 return str;
 }

 ///

 /// 附件信息
 ///

 public struct AttachmentInfo
 {
 ///

 /// 附件的文件名 [如果输入路径，则自动转换为文件名]
 ///

 public string FileName {
 get { return fileName; }
 set { fileName = Path.GetFileName(value); }
 } private string fileName;

 ///

 /// 附件的内容 [由经Base64编码的字节组成]
 ///

 public string Bytes {
 get { return bytes; }
 set { if (value != bytes) bytes = value; }
 } private string bytes;

 ///

 /// 从流中读取附件内容并构造
 ///

 /// 附件的文件名
 /// 流
 public AttachmentInfo (string ifileName, Stream stream)
 {
 fileName = Path.GetFileName (ifileName);
 byte[] by = new byte [stream.Length];
 stream.Read (by,0,(int)stream.Length); // 读取文件内容
 //格式转换
 bytes = Convert.ToBase64String (by); // 转化为base64编码
 }

 ///

 /// 按照给定的字节构造附件
 ///

 /// 附件的文件名
 /// 附件的内容 [字节]
 public AttachmentInfo (string ifileName, byte[] ibytes)
 {
 fileName = Path.GetFileName (ifileName);
 bytes = Convert.ToBase64String (ibytes); // 转化为base64编码
 }

 ///

 /// 从文件载入并构造
 ///

 ///
 public AttachmentInfo (string path)
 {
 fileName = Path.GetFileName (path);
 FileStream file = new FileStream (path, FileMode.Open);
 byte[] by = new byte [file.Length];
 file.Read (by,0,(int)file.Length); // 读取文件内容
 //格式转换
 bytes = Convert.ToBase64String (by); // 转化为base64编码
 file.Close ();
 }
 }
 }
}

---

// 使用:

 MailSender ms = new MailSender ();
 ms.From = "jovenc@tom.com";
 ms.To = "jovenc@citiz.net";
 ms.Subject = "Subject";
 ms.Body = "body text";
 ms.UserName = "########";  // 怎么能告诉你呢
 ms.Password = "********"; // 怎么能告诉你呢
 ms.Server = "smtp.tom.com";

 ms.Attachments.Add (new MailSender.AttachmentInfo (@"D: est.txt"));

 Console.WriteLine ("mail sending...");
 try
 {
 ms.SendMail ();
 Console.WriteLine ("mail sended.");
 }
 catch (Exception e)
 {
 Console.WriteLine (e);
 }