C# MAIL CLASS

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Collections;

namespace lion_office.Data.Library.MailClass
{
/* 
Create By lion 
2002-11-20 01:44 
Copyright (C) 2001,2002 www.LionSky.Net. All rights reserved.
Web: http://www.Lionsky.net
Email: lion-a@sohu.com
Support .Net Framework Beta 2 
*/ 
   public class ESmtpMail
   {
      private string enter="\r\n";
      /// <summary>
      /// 设定语言代码，默认设定为GB2312，如不需要可设置为""
      /// </summary>
      public string Charset="GB2312";
      /// <summary>
      /// 发件人地址
      /// </summary>
      public string From="";
      /// <summary>
      /// 发件人姓名
      /// </summary>
      public string FromName="";
      /// <summary>
      /// 回复邮件地址
      /// </summary>
      //public string ReplyTo="";
      /// <summary>
      /// 收件人姓名
      /// </summary>   
      public string RecipientName="";
      /// <summary>
      /// 收件人列表
      /// </summary>
      private Hashtable Recipient=new Hashtable();
      /// <summary>
      /// 邮件服务器域名
      /// </summary>   
      private string mailserver="";
      /// <summary>
      /// 邮件服务器端口号
      /// </summary>   
      private int mailserverport=25;
      /// <summary>
      /// SMTP认证时使用的用户名
      /// </summary>
      private string username="";
      /// <summary>
      /// SMTP认证时使用的密码
      /// </summary>
      private string password="";
      /// <summary>
      /// 是否需要SMTP验证
      /// </summary>      
      private bool ESmtp=false;
      /// <summary>
      /// 是否Html邮件
      /// </summary>      
      public bool Html=false;
      /// <summary>
      /// 邮件附件列表
      /// </summary>
      private System.Collections.ArrayList Attachments;
      /// <summary>
      /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"
      /// </summary>
      private string priority="Normal";
      /// <summary>
      /// 邮件主题
      /// </summary>      
      public string Subject="";
      /// <summary>
      /// 邮件正文
      /// </summary>      
      public string Body="";
      /// <summary>
      /// 收件人数量
      /// </summary>
      private int RecipientNum=0;
      /// <summary>
      /// 最多收件人数量
      /// </summary>
      private int recipientmaxnum=1;
      /// <summary>
      /// 密件收件人数量
      /// </summary>
      //private int RecipientBCCNum=0;
      /// <summary>
      /// 错误消息反馈
      /// </summary>
      private string errmsg;
      /// <summary>
      /// TcpClient对象，用于连接服务器
      /// </summary>   
      private TcpClient tc;
      /// <summary>
      /// NetworkStream对象
      /// </summary>   
      private NetworkStream ns;
      /// <summary>
      /// SMTP错误代码哈希表
      /// </summary>
      private Hashtable ErrCodeHT = new Hashtable();
      /// <summary>
      /// SMTP正确代码哈希表
      /// </summary>
      private Hashtable RightCodeHT = new Hashtable();
      public ESmtpMail()
      {
         Attachments = new System.Collections.ArrayList();
      }      
      /// <summary>
      /// 邮件服务器域名和验证信息
      /// 形如："user:pass@www.server.com:25"，也可省略次要信息。如"user:pass@www.server.com"或"www.server.com"
      /// </summary>   
      public string MailDomain
      {
         set
         {
            string maidomain=value.Trim();
            int tempint;

            if(maidomain!="")
            {
               tempint=maidomain.IndexOf("@");
               if(tempint!=-1)
               {
                  string str=maidomain.Substring(0,tempint);
                  MailServerUserName=str.Substring(0,str.IndexOf(":"));
                  MailServerPassWord=str.Substring(str.IndexOf(":")+1,str.Length-str.IndexOf(":")-1);
                  maidomain=maidomain.Substring(tempint+1,maidomain.Length-tempint-1);
               }

               tempint=maidomain.IndexOf(":");
               if(tempint!=-1)
               {
                  mailserver=maidomain.Substring(0,tempint);
                  mailserverport=System.Convert.ToInt32(maidomain.Substring(tempint+1,maidomain.Length-tempint-1));
               }
               else
               {
                  mailserver=maidomain;

               }

               
            }

         }
      }

 

      /// <summary>
      /// 邮件服务器端口号
      /// </summary>   
      public int MailDomainPort
      {
         set
         {
            mailserverport=value;
         }
      }

 

      /// <summary>
      /// SMTP认证时使用的用户名
      /// </summary>
      public string MailServerUserName
      {
         set
         {
            if(value.Trim()!="")
            {
               username=value.Trim();
               ESmtp=true;
            }
            else
            {
               username="";
               ESmtp=false;
            }
         }
      }

      /// <summary>
      /// SMTP认证时使用的密码
      /// </summary>
      public string MailServerPassWord
      {
         set
         {
            password=value;
         }
      }   

      /// <summary>
      /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"
      /// </summary>
      public string Priority
      {
         set
         {
            switch(value.ToLower())
            {
               case "high":
                  priority="High";
                  break;

               case "1":
                  priority="High";
                  break;

               case "normal":
                  priority="Normal";
                  break;

               case "3":
                  priority="Normal";
                  break;

               case "low":
                  priority="Low";
                  break;

               case "5":
                  priority="Low";
                  break;

               default:
                  priority="Normal";
                  break;
            }
         }
      }

      /// <summary>
      /// 错误消息反馈
      /// </summary>      
      public string ErrorMessage
      {
         get
         {
            return errmsg;
         }
      }

 

      /// <summary>
      /// 服务器交互记录
      /// </summary>
      private string logs="";

      /// <summary>
      /// 服务器交互记录，如发现本组件不能使用的SMTP服务器，请将出错时的Logs发给我（lion-a@sohu.com），我将尽快查明原因。
      /// </summary>
      public string Logs
      {
         get
         {
            return logs;
         }
      }
      

 

      /// <summary>
      /// SMTP回应代码哈希表
      /// </summary>
      private void SMTPCodeAdd()
      {
         ErrCodeHT.Add("500","邮箱地址错误");
         ErrCodeHT.Add("501","参数格式错误");
         ErrCodeHT.Add("502","命令不可实现");
         ErrCodeHT.Add("503","服务器需要SMTP验证");
         ErrCodeHT.Add("504","命令参数不可实现");
         ErrCodeHT.Add("421","服务未就绪，关闭传输信道");
         ErrCodeHT.Add("450","要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）");
         ErrCodeHT.Add("550","要求的邮件操作未完成，邮箱不可用（例如，邮箱未找到，或不可访问）");
         ErrCodeHT.Add("451","放弃要求的操作；处理过程中出错");
         ErrCodeHT.Add("551","用户非本地，请尝试<forward-path>");
         ErrCodeHT.Add("452","系统存储不足，要求的操作未执行");
         ErrCodeHT.Add("552","过量的存储分配，要求的操作未执行");
         ErrCodeHT.Add("553","邮箱名不可用，要求的操作未执行（例如邮箱格式错误）");
         ErrCodeHT.Add("432","需要一个密码转换");
         ErrCodeHT.Add("534","认证机制过于简单");
         ErrCodeHT.Add("538","当前请求的认证机制需要加密");
         ErrCodeHT.Add("454","临时认证失败");
         ErrCodeHT.Add("530","需要认证");

         RightCodeHT.Add("220","服务就绪");
         RightCodeHT.Add("250","要求的邮件操作完成");
         RightCodeHT.Add("251","用户非本地，将转发向<forward-path>");
         RightCodeHT.Add("354","开始邮件输入，以<enter>.<enter>结束");
         RightCodeHT.Add("221","服务关闭传输信道");
         RightCodeHT.Add("334","服务器响应验证Base64字符串");
         RightCodeHT.Add("235","验证成功");
      }

      /// <summary>
      /// 将字符串编码为Base64字符串
      /// </summary>
      /// <param name="estr">要编码的字符串</param>
      private string Base64Encode(string str)
      {
         byte[] barray;
         barray=Encoding.Default.GetBytes(str);
         return Convert.ToBase64String(barray);
      }

      /// <summary>
      /// 将Base64字符串解码为普通字符串
      /// </summary>
      /// <param name="dstr">要解码的字符串</param>
      private string Base64Decode(string str)
      {
         byte[] barray;
         barray=Convert.FromBase64String(str);
         return Encoding.Default.GetString(barray);
      }

      
      /// <summary>
      /// 得到上传附件的文件流
      /// </summary>
      /// <param name="FilePath">附件的绝对路径</param>
      private string GetStream(string FilePath)
      {
         //建立文件流对象
         System.IO.FileStream FileStr=new System.IO.FileStream(FilePath,System.IO.FileMode.Open);
         byte[] by=new byte[System.Convert.ToInt32(FileStr.Length)];
         FileStr.Read(by,0,by.Length);
         FileStr.Close();
         return(System.Convert.ToBase64String(by));
      }

      /// <summary>
      /// 添加邮件附件
      /// </summary>
      /// <param name="path">附件绝对路径</param>
      public void AddAttachment(string path)
      {
         Attachments.Add(path);
      }
      
      

      /// <summary>
      /// 添加一个收件人
      /// </summary>   
      /// <param name="str">收件人地址</param>
      public bool AddRecipient(string str)
      {
         str=str.Trim();
         if(str==null||str==""||str.IndexOf("@")==-1)
            return true;
         if(RecipientNum<recipientmaxnum)
         {
            Recipient.Add(RecipientNum,str);
            RecipientNum++;            
            return true;
         }
         else
         {
            errmsg+="收件人过多";
            return false;
         }
      }

      /// <summary>
      /// 最多收件人数量
      /// </summary>
      public int RecipientMaxNum
      {
         set
         {
            recipientmaxnum = value;
         }
      }

      /// <summary>
      /// 添加一组收件人（不超过recipientmaxnum个），参数为字符串数组
      /// </summary>
      /// <param name="str">保存有收件人地址的字符串数组（不超过recipientmaxnum个）</param>   
      public bool AddRecipient(string[] str)
      {
         for(int i=0;i<str.Length;i++)
         {
            if(!AddRecipient(str[i]))
            {
               return false;
            }
         }
         return true;
      }

      /// <summary>
      /// 发送SMTP命令
      /// </summary>   
      private bool SendCommand(string str)
      {
         byte[]  WriteBuffer;
         if(str==null||str.Trim()=="")
         {
            return true;
         }
         logs+=str;
         WriteBuffer = Encoding.Default.GetBytes(str);
         try
         {
            ns.Write(WriteBuffer,0,WriteBuffer.Length);
         }
         catch
         {
            errmsg="网络连接错误";
            return false;
         }
         return true;
      }

      /// <summary>
      /// 接收SMTP服务器回应
      /// </summary>
      private string RecvResponse()
      {
         int StreamSize;
         string ReturnValue = "";
         byte[]  ReadBuffer = new byte[1024] ;
         try
         {
            StreamSize=ns.Read(ReadBuffer,0,ReadBuffer.Length);
         }
         catch
         {
            errmsg="网络连接错误";
            return "false";
         }

         if (StreamSize==0)
         {
            return ReturnValue ;
         }
         else
         {
            ReturnValue = Encoding.Default.GetString(ReadBuffer).Substring(0,StreamSize);
            logs+=ReturnValue;
            return  ReturnValue;
         }
      }

      /// <summary>
      /// 与服务器交互，发送一条命令并接收回应。
      /// </summary>
      /// <param name="Command">一个要发送的命令</param>
      /// <param name="errstr">如果错误，要反馈的信息</param>
      private bool Dialog(string str,string errstr)
      {
         if(str==null||str.Trim()=="")
         {
            return true;
         }
         if(SendCommand(str))
         {
            string RR=RecvResponse();
            if(RR=="false")
            {
               return false;
            }
            string RRCode=RR.Substring(0,3);
            if(RightCodeHT[RRCode]!=null)
            {
               return true;
            }
            else
            {
               if(ErrCodeHT[RRCode]!=null)
               {
                  errmsg+=(RRCode+ErrCodeHT[RRCode].ToString());
                  errmsg+=enter;
               }
               else
               {
                  errmsg+=RR;
               }
               errmsg+=errstr;
               return false;
            }
         }
         else
         {
            return false;
         }

      }

      /// <summary>
      /// 与服务器交互，发送一组命令并接收回应。
      /// </summary>

      private bool Dialog(string[] str,string errstr)
      {
         for(int i=0;i<str.Length;i++)
         {
            if(!Dialog(str[i],""))
            {
               errmsg+=enter;
               errmsg+=errstr;
               return false;
            }
         }

         return true;
      }

 

      private bool SendEmail()
      {
         //连接网络
         try
         {
            tc=new TcpClient(mailserver,mailserverport);
         }
         catch(Exception e)
         {
            errmsg=e.ToString();
            return false;
         }

         ns = tc.GetStream();
         SMTPCodeAdd();

         //验证网络连接是否正确
         if(RightCodeHT[RecvResponse().Substring(0,3)]==null)
         {
            errmsg="网络连接失败";
            return false;
         }

         string[] SendBuffer;
         string SendBufferstr;

         //进行SMTP验证
         if(ESmtp)
         {
            SendBuffer=new String[4];
            SendBuffer[0]="EHLO " + mailserver + enter;
            SendBuffer[1]="AUTH LOGIN" + enter;
            SendBuffer[2]=Base64Encode(username) + enter;
            SendBuffer[3]=Base64Encode(password) + enter;
            if(!Dialog(SendBuffer,"SMTP服务器验证失败，请核对用户名和密码。"))
               return false;
         }
         else
         {
            SendBufferstr="HELO " + mailserver + enter;
            if(!Dialog(SendBufferstr,""))
               return false;
         }

         //
         SendBufferstr="MAIL FROM:<" + From + ">" + enter;
         if(!Dialog(SendBufferstr,"发件人地址错误，或不能为空"))
            return false;

         //
         SendBuffer=new string[recipientmaxnum];
         for(int i=0;i<Recipient.Count;i++)
         {

            SendBuffer[i]="RCPT TO:<" + Recipient[i].ToString() +">" + enter;

         }
         if(!Dialog(SendBuffer,"收件人地址有误"))
            return false;

         SendBufferstr="DATA" + enter;
         if(!Dialog(SendBufferstr,""))
            return false;

         SendBufferstr="From:" + FromName + "<" + From +">" +enter;

         SendBufferstr += "To:=?"+Charset.ToUpper()+"?B?"+Base64Encode(RecipientName)+"?="+"<"+Recipient[0]+">"+enter;
         SendBufferstr+="CC:";
         for(int i=0;i<Recipient.Count;i++)
         {
            SendBufferstr+=Recipient[i].ToString() + "<" + Recipient[i].ToString() +">,";
         }
         SendBufferstr+=enter;

         if(Charset=="")
         {
            SendBufferstr+="Subject:" + Subject + enter;
         }
         else
         {
            SendBufferstr+="Subject:" + "=?" + Charset.ToUpper() + "?B?" + Base64Encode(Subject) +"?=" +enter;
         }

         SendBufferstr+="X-Priority:" + priority + enter;
         SendBufferstr+="X-MSMail-Priority:" + priority + enter;
         SendBufferstr+="Importance:" + priority + enter;
         SendBufferstr+="X-Mailer: Huolx.Pubclass" + enter;
         SendBufferstr+="MIME-Version: 1.0" + enter;

         SendBufferstr += "Content-Type: multipart/mixed;"+enter;//内容格式和分隔符
         SendBufferstr += "   boundary=\"----=_NextPart_000_00D6_01C29593.AAB31770\""+enter;
         SendBufferstr += "------=_NextPart_000_00D6_01C29593.AAB31770"+enter;

         if(Html)
         {
            SendBufferstr+="Content-Type: text/html;" + enter;
         }
         else
         {
            SendBufferstr+="Content-Type: text/plain;" + enter;
         }

         if(Charset=="")
         {
            SendBufferstr+="   charset=\"iso-8859-1\"" + enter;
         }
         else
         {
            SendBufferstr+="   charset=\"" + Charset.ToLower() + "\"" + enter;
         }
         //SendBufferstr += "Content-Transfer-Encoding: base64"+enter;

         SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;

         SendBufferstr+= Base64Encode(Body) + enter;
         if(Attachments.Count!=0)
         {
            foreach(string filepath in Attachments)
            {
               
               SendBufferstr += "------=_NextPart_000_00D6_01C29593.AAB31770"+enter;
               SendBufferstr += "Content-Type: application/octet-stream"+enter;
               SendBufferstr += "   name=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter;
               SendBufferstr += "Content-Transfer-Encoding: base64"+enter;
               SendBufferstr += "Content-Disposition: attachment;"+enter;
               SendBufferstr += "   filename=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter+enter;
               SendBufferstr += GetStream(filepath)+enter+enter;
            }
         }
         SendBufferstr += "------=_NextPart_000_00D6_01C29593.AAB31770--"+enter+enter;
         
         
         SendBufferstr += enter + "." + enter;

         if(!Dialog(SendBufferstr,"错误信件信息"))
            return false;

         SendBufferstr="QUIT" + enter;
         if(!Dialog(SendBufferstr,"断开连接时错误"))
            return false;

         ns.Close();
         tc.Close();
         return true;
      }

      /// <summary>
      /// 发送邮件方法，所有参数均通过属性设置。
      /// </summary>
      public bool Send()
      {
         if(Recipient.Count==0)
         {
            errmsg="收件人列表不能为空";
            return false;
         }

         if(mailserver.Trim()=="")
         {
            errmsg="必须指定SMTP服务器";
            return false;
         }

         return SendEmail();
         
      }

      /// <summary>
      /// 发送邮件方法
      /// </summary>
      /// <param name="smtpserver">smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信息，如"www.smtpserver.com"</param>
      public bool Send(string smtpserver)
      {
         
         MailDomain=smtpserver;
         return Send();
      }

      /// <summary>
      /// 发送邮件方法
      /// </summary>
      /// <param name="smtpserver">smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信息，如"www.smtpserver.com"</param>
      /// <param name="from">发件人mail地址</param>
      /// <param name="fromname">发件人姓名</param>
      /// <param name="to">收件人地址</param>
      /// <param name="toname">收件人姓名</param>
      /// <param name="html">是否HTML邮件</param>
      /// <param name="subject">邮件主题</param>
      /// <param name="body">邮件正文</param>
      public bool Send(string smtpserver,string from,string fromname,string to,string toname,bool html,string subject,string body)
      {
         MailDomain=smtpserver;
         From=from;
         FromName=fromname;
         AddRecipient(to);
         RecipientName=toname;
         Html=html;
         Subject=subject;
         Body=body;
         return Send();
      }
      
      
   }
}