C#写的支持SMTP验证的发送邮件组件

这是我学C#后写的第一个比较拿得出手的东西，肯定有很多错误之处，还望各位高手指正。

写它的原因就是.net自带的SmtpMail不支持SMTP认证（说句题外话，我真很奇怪， 从ASP到ASP.NET，M$的邮件组件老是慢半拍，ASP中的CDONTS难得能有正常使用的， 到了.NET时代，SMTP服务器基本都得验证才能用，.NET的SmtpMail又不支持验证， 真是～～～），我费了好几天功夫才弄明白怎样把原来的Jmail怎么弄到.NET下用， 可用起来还是比较麻烦，正好买了本《C#网络程序设计》，作为实践项目，也是为了 让自己以后轻松一点，我写了这个东西。

程序架构可能有些乱，都是原来写ASP时留下的毛病，如果那位能帮我弄得整齐一点，小弟感激不尽。

欢迎大家提出修改建议，或者自行修改，最好能把修改稿Mail给我一份，让我也学习学习 ^_^。

完整的源代码和编译好的DLL可以从下面的URL下载。 http://huolx.t2008.com/class.asp?classlevel=3&classname=.net技术&l2classname=ESmtpmail&articleid=-486856519
下面开始贴源代码。

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

namespace Huolx.Pubclass
{
/// <summary>
/// <para>支持SMTP服务器认证的邮件发送类</para>
/// <para></para>
/// <para>ver 1.0B</para>
/// <para>属性和方法设置类似于Jmail。</para>
/// <para></para>
/// <para>Huolx(flycloud@btamail.net.cn)版权所有，转载请保留。</para>
/// </summary>
/// <remarks>
/// <para>这是我学C#后写的第一个比较拿得出手的东西，肯定有很多错误之处，还望各位高手指正。</para>
/// <para></para>
/// <para>写它的原因就是.net自带的SmtpMail不支持SMTP认证（说句题外话，我真很奇怪，
/// 从ASP到ASP.NET，M$的邮件组件老是慢半拍，ASP中的CDONTS难得能有正常使用的，
/// 到了.NET时代，SMTP服务器基本都得验证才能用，.NET的SmtpMail又不支持验证，
/// 真是～～～），我费了好几天功夫才弄明白怎样把原来的Jmail怎么弄到.NET下用，
/// 可用起来还是比较麻烦，正好买了本《C#网络程序设计》，作为实践项目，也是为了
/// 让自己以后轻松一点，我写了这个东西。</para>
/// <para></para>
/// <para>程序架构可能有些乱，都是原来写ASP时留下的毛病，如果那位能帮我弄得整齐一点，小弟感激不尽。</para>
/// <para></para>
/// <para>欢迎大家提出修改建议，或者自行修改，最好能把修改稿Mail给我一份，让我也学习学习 ^_^。</para>
/// </remarks>
public class ESmtpMail
{

/// <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>
/// 邮件服务器域名
/// </summary>
private string mailserver="";

/// <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 up=maidomain.Substring(0,tempint);
MailServerUserName=up.Substring(0,up.IndexOf(":"));
MailServerPassWord=up.Substring(up.IndexOf(":")+1,up.Length-up.IndexOf(":")-1);
string ms=maidomain.Substring(tempint+1,maidomain.Length-tempint-1);
tempint=ms.IndexOf(":");
if(tempint!=-1)
{
mailserver=ms.Substring(0,tempint);
mailserverport=System.Convert.ToInt32(ms.Substring(tempint+1,ms.Length-tempint-1));
}
}
else
{
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>
private int mailserverport=25;

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

/// <summary>
/// 是否需要SMTP验证
/// </summary>
private bool ESmtp=false;

/// <summary>
/// SMTP认证时使用的用户名
/// </summary>
private string username="";

/// <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>
private string password="";

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

/// <summary>
/// 邮件主题
/// </summary>
public string Subject="";

/// <summary>
/// 是否Html邮件
/// </summary>
public bool Html=false;

/// <summary>
/// 邮件正文
/// </summary>
public string Body="";

/// <summary>
/// 收件人列表
/// </summary>
private Hashtable Recipient=new Hashtable();

/// <summary>
/// 密送收件人列表
/// </summary>
private Hashtable RecipientBCC=new Hashtable();

/// <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>
private string errmsg;

/// <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（flycloud@btamail.net.cn），我将尽快查明原因。
/// </summary>
public string Logs
{
get
{
return logs;
}
}

private string enter="\r\n";
/// <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();

/// <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<CRLF>.<CRLF>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 estr)
{
byte[] barray;
barray=Encoding.Default.GetBytes(estr);
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 dstr)
{
byte[] barray;
barray=Convert.FromBase64String(dstr);
return Encoding.Default.GetString(barray);
}

public ESmtpMail()
{
}

~ESmtpMail()
{
}

/// <summary>
/// 收件人姓名
/// </summary>
public string RecipientName="";

private int RecipientNum=0;//收件人数量
private int RecipientBCCNum=0;//密件收件人数量

/// <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<10)
{
Recipient.Add(RecipientNum,str);
RecipientNum++;
return true;
}
else
{
errmsg+="收件人过多";
return false;
}
}

/// <summary>
/// 添加一组收件人（不超过10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10个）</param>
public bool AddRecipient(string[] str)
{
for(int i=0;i<str.Length;i++)
{
if(!AddRecipient(str[i]))
{
return false;
}
}
return true;
}

/// <summary>
/// 添加一个密件收件人
/// </summary>
/// <param name="str">收件人地址</param>
public bool AddRecipientBCC(string str)
{
if(str==null||str.Trim()=="")
return true;
if(RecipientBCCNum<10)
{
RecipientBCC.Add(RecipientBCCNum,str);
RecipientBCCNum++;
return true;
}
else
{
errmsg+="收件人过多";
return false;
}
}

/// <summary>
/// 添加一组密件收件人（不超过10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10个）</param>
public bool AddRecipientBCC(string[] str)
{
for(int i=0;i<str.Length;i++)
{
if(!AddRecipientBCC(str[i]))
{
return false;
}
}
return true;
}

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

C#写的支持SMTP验证的发送邮件组件(2) 程序开发

/// <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 Command,string errstr)
{
if(Command==null||Command.Trim()=="")
{
return true;
}
if(SendCommand(Command))
{
string RR=RecvResponse();
if(RR=="false")
{
return false;
}
string RRCode=RR.Substring(0,3);
if(RightCodeHT[RRCode]!=null)
{
return true;
}
else
{
errmsg+=(RRCode+ErrCodeHT[RRCode].ToString());
errmsg+=enter;
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[] Command,string errstr)
{
for(int i=0;i<Command.Length;i++)
{
if(!Dialog(Command[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"))
return false;

//
SendBuffer=new string[10];
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;

SendBuffer=new string[10];
for(int i=0;i<RecipientBCC.Count;i++)
{

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

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

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

SendBufferstr="From:" + FromName + "<" + From +">" +enter;
SendBufferstr+="To:" + RecipientName + "<" + Recipient[0] +">" +enter;
SendBufferstr+="CC:";
for(int i=1;i<Recipient.Count;i++)
{
SendBufferstr+=Recipient[i].ToString() + "<" + Recipient[i].ToString() +">,";
}
SendBufferstr+=enter;

if(ReplyTo.Trim()!="")
{
SendBufferstr+="Reply-To: " + ReplyTo + enter;
}

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

SendBufferstr+="MIME-Version: 1.0" + 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+="X-Priority:" + priority + enter;
SendBufferstr+="X-MSMail-Priority:" + priority + enter;
SendBufferstr+="Importance:" + priority + enter;
SendBufferstr+="X-Mailer: Huolx.Pubclass" + enter;
SendBufferstr+= enter + enter;
SendBufferstr+= Base64Encode(Body) + 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(RecipientName=="")
RecipientName=Recipient[0].ToString();

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="replyto">回复邮件地址</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 replyto,string to,string toname,bool html,string subject,string body)
{
MailDomain=smtpserver;
From=from;
FromName=fromname;
ReplyTo=replyto;
AddRecipient(to);
RecipientName=toname;
Html=html;
Subject=subject;
Body=body;
return Send();

}
}
}