c#发送邮件类(含接收邮件和发送邮件源码)

实现发送邮件的类，同时包含POP3接收邮件类

using System; using System.Net.Sockets;//用于处理网络连接 using System.IO; //用于处理附件的包 using System.Text;//用于处理文本编码 using System.Data; using System.Net;namespace Email{public class MailSend:TcpClient { /*SMTP服务器域名*/private string strServer;public string server{get{return strServer;}set{if(strServer!=value){strServer=value;}}}/*SMTP服务器端口*/private int strPort;public int port{get{return strPort;}set{if(strPort!=value){strPort=value;}}}/*用户名*/private string strUse=null;public String username{get{return strUse;}set{if(strUse!=value){strUse=value;}}}/*密码*/private string strPass=null;public String password{get{return strPass;}set{if(strPass!=value){strPass=value;}}}/*主题*/private string strSub="";public String subject{get{return strSub;}set{if(strSub!=value){strSub=value;}}}/*文本内容*/private string strBody="";public String body{get{return strBody;}set{if(strBody!=value){strBody=value;}}}/*超文本内容*/private string strHtm="";public String htmlbody{get{return strHtm;}set{if(strHtm!=value){strHtm=value;}}}/*发件人地址*/private string strFrom="";public String from{get{return strFrom;}set{if(strFrom!=value){strFrom=value;}}} /*收件人地址*/private string strTo="";public String to{get{return strTo;}set{if(strTo!=value){strTo=value;}}}/*发件人姓名*/private string strFName="";public String fromname{get{return strFName;}set{if(strFName!=value){strFName=value;}}}/*收件人姓名*/private string strTName="";public String toname{get{return strTName;}set{if(strTName!=value){strTName=value;}}}/*邮件编码*/private string strEncode="8bit";public String encode{get{return strEncode;}set{if(strEncode!=value){strEncode=value;}}}/*邮件优先级*/private int intPriority=0;public int priority{get{return intPriority;}set{if(intPriority!=value){intPriority=value;}}}/*语言编码*/private string strCharset="gb2312";public String charset{get{return strCharset;}set{if(strCharset!=value){strCharset=value;}}}/*html邮件标志*/private bool isHtml=false;public bool html{get{return isHtml;}set{if(isHtml!=value){isHtml=value;}}}private DataTable filelist;//附件列表　 public MailSend() { }/*发送邮件*/public void Send(){filelist = new DataTable();//已定义变量，初始化操作 filelist.Columns.Add(new DataColumn("filename",typeof(string)));//文件名 filelist.Columns.Add(new DataColumn("filecontent",typeof(string)));//文件内容 /*准备发送*/WriteStream("mail From: " strFrom);WriteStream("rcpt to: " strTo);WriteStream("data");/*发送邮件头*/WriteStream("Date: " DateTime.Now);//时间 WriteStream("From: " strFName "<" strFrom ">");//发件人 WriteStream("Subject: " strSub);//主题 WriteStream("To:" strTName "<" strTo ">");//收件人 //邮件格式 WriteStream("Content-Type: multipart/mixed; boundary=\"unique-boundary-1\""); WriteStream("Reply-To:" strFrom);//回复地址 WriteStream("X-Priority:" intPriority);//优先级 WriteStream("MIME-Version:1.0");//MIME版本 //数据ID,随意 WriteStream("Message-Id: " DateTime.Now.ToFileTime() "@security.com"); WriteStream("Content-Transfer-Encoding:" strEncode);//内容编码 WriteStream("X-Mailer:DS Mail Sender V1.0");//邮件发送者 WriteStream("");WriteStream(AuthStream("This is a multi-part message in MIME format.")); WriteStream(""); //从此处开始进行分隔输入 WriteStream("--unique-boundary-1"); //在此处定义第二个分隔符 WriteStream("Content-Type: multipart/alternative;Boundary=\"unique-boundary-2\""); WriteStream(""); if(!isHtml){//文本信息WriteStream("--unique-boundary-2"); WriteStream("Content-Type: text/plain;charset=" strCharset); WriteStream("Content-Transfer-Encoding:" strEncode); WriteStream(""); WriteStream(strBody); WriteStream("");//一个部分写完之后就写如空信息，分段 WriteStream("--unique-boundary-2--");//分隔符的结束符号，尾巴后面多了-- WriteStream("");}else{//html信息 WriteStream("--unique-boundary-2"); WriteStream("Content-Type: text/html;charset=" strCharset); WriteStream("Content-Transfer-Encoding:" strEncode); WriteStream(""); WriteStream(strHtm); WriteStream(""); WriteStream("--unique-boundary-2--");//分隔符的结束符号，尾巴后面多了-- WriteStream(""); }//增加附件 Attachment();//这个方法是我们在上面讲过的，实际上他放在这 WriteStream(""); WriteStream("--unique-boundary-1--");if (!OperaStream(".","250"))//最后写完了，输入"." { this.Close(); //关闭连接 }} /*向服务器写入命令的方法*/private void WriteStream(String strCmd) { Stream TcpStream;//定义操作对象 strCmd = strCmd "\r\n"; //加入换行符 TcpStream =this.GetStream();//获取数据流 //将命令行转化为byte[] byte[] bWrite = Encoding.GetEncoding(strCharset).GetBytes(strCmd.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<length)page=length/size 1; else page=length/size; for (int i=0;i<page;i ){ start=i*size; if (i==page-1) count=length-(i*size); TcpStream.Write(bWrite,start,count);//将数据写入到服务器上 } } else TcpStream.Write(bWrite,0,bWrite.Length); } catch(Exception) {} }/*接收服务器的返回信息*/private string ReceiveStream() { String sp=null; byte[] by=new byte[1024]; NetworkStream ns = this.GetStream();//此处即可获取服务器的返回数据流 int size=ns.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*/private bool OperaStream(string strCmd,string state) {string sp=null; bool success=false; try { WriteStream(strCmd);//写入命令 sp = ReceiveStream();//接受返回信息 if (sp.IndexOf(state)!=-1)//判断状态码是否正确 success=true; } catch(Exception ex) {Console.Write(ex.ToString());} return success; }/*取得服务器的连接*/public bool getMailServer() { try { //域名解析 System.Net.IPAddress ipaddress=(IPAddress)System.Net.Dns.Resolve(strServer).AddressList.GetValue(0); System.Net.IPEndPoint endpoint=new IPEndPoint(ipaddress,strPort); Connect(endpoint);//连接Smtp服务器 ReceiveStream();//获取连接信息 if (strUse!=null) { //开始进行服务器认证 //如果状态码是250则表示操作成功 if (!OperaStream("EHLO Localhost","250")) { this.Close(); return false; } if (!OperaStream("AUTH LOGIN","334")) { this.Close(); return false; } strUse=AuthStream(strUse);//此处将username转换为Base64码 if (!OperaStream(strUse,"334")) { this.Close(); return false; } strPass=AuthStream(strPass);//此处将password转换为Base64码 if (!OperaStream(strPass,"235")) { this.Close(); return false; } return true; } else { //如果服务器不需要认证 if (OperaStream("HELO Localhost","250")) { return true; } else { return false; } } } catch(Exception ex) { System.Console.Write(ex.Message);return false;} }/*将数据转化为Base64编码字符串*/private string AuthStream(String strCmd) { try { byte[] by=Encoding.Default.GetBytes(strCmd.ToCharArray()); strCmd=Convert.ToBase64String(by); } catch(Exception ex) {return ex.ToString();} return strCmd; } /*载入附件文件*/public void LoadAttFile(String path) { //根据路径读出文件流 FileStream fstr=new FileStream(path,FileMode.Open);//建立文件流对象 byte[] by=new byte[Convert.ToInt32(fstr.Length)]; fstr.Read(by,0,by.Length);//读取文件内容 fstr.Close();//关闭 //格式转换 String fileinfo=Convert.ToBase64String(by);//转化为base64编码 //增加到文件表中 DataRow dr=filelist.NewRow(); dr[0]=Path.GetFileName(path);//获取文件名 dr[1]=fileinfo;//文件内容 filelist.Rows.Add(dr);//增加 }/*发送附件*/private void Attachment() { //对文件列表做循环 for (int i=0;i<filelist.Rows.Count;i ){ DataRow dr=filelist.Rows[i]; WriteStream("--unique-boundary-1");//邮件内容分隔符 WriteStream("Content-Type: application/octet-stream;name=\"" dr[0].ToString() "\"");//文件格式 WriteStream("Content-Transfer-Encoding: base64");//内容的编码 WriteStream("Content-Disposition:attachment;filename=\"" dr[0].ToString() "\"");//文件名 WriteStream(""); String fileinfo=dr[1].ToString(); WriteStream(fileinfo);//写入文件的内容 WriteStream(""); } }/*退出服务器连接*/public bool quitMailServer(){if(!OperaStream("quit","250")){return false;}return true;}}}