对“[原创]EMAIL发送系统(C#+基于SMTP认证)”的改写

这个是对于

[原创]EMAIL发送系统(C#+基于SMTP认证)
http://www.lionsky.net/MyWebsite/article/list.aspx?id=430

的改版
在为公司写通知服务时，从网上找到了以上地址，非常感谢原作者创造性的劳动。改写的目的是为了适应作为服务运行的要求：
1、适应多线程的要求，发送邮件服务可在后台运行，将与SMTP服务器的连接视为独占资源。
2、适应稳定性的要求，不再以简单地抛出异常来处理错误，在出现异常后等待一定时间间隔后重试，重试一段时间间隔后若还时发不出去，则认为是SMTP出错，返回发送邮件不成功的标识。
3、精简属性、方法，与邮件相关的信息不再作为属性，而是作为send的参数传入；只公布了一个无重载的send方法。以此类为基类，另写通知服务要求的接口方法。
以下是改写后的代码：
using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.Threading;

namespace Deep.SendEmail
{
#region AspNetPager Server Control

///

1<summary>   
2/// 邮件可以通过 Microsoft Windows 2000 中内置的 SMTP 邮件服务或任意 SMTP 服务器来传送   
3/// </summary>

public class SmtpMail
{

private const string ENTER="\r\n";

///

1<summary>   
2/// 设定语言代码，默认设定为GB2312，如不需要可设置为""   
3/// </summary>

private string m_charset="GB2312";

///

1<summary>   
2/// 服务器交互记录   
3/// </summary>

private StringBuilder m_logs = new StringBuilder();

private string m_ErrCode;

///

1<summary>   
2/// SMTP错误代码哈希表   
3/// </summary>

private Hashtable m_ErrCodeHT = new Hashtable();

///

1<summary>   
2/// SMTP正确代码哈希表   
3/// </summary>

private Hashtable m_RightCodeHT = new Hashtable();

///

1<summary>   
2/// 最多收件人数量   
3/// </summary>

private int m_recipientMaxnum = 2;

///

1<summary>   
2/// 重复时间，以秒为单位   
3/// </summary>

private int m_RepeatTime = 120;

///

1<summary>   
2/// 服务器出错或拒绝后的等待时间,以毫秒为单位   
3/// </summary>

private int m_WaitTime = 20000;

///

1<summary>   
2/// 初始化 <see cref="Lion.Web.Mail.SmtpMail"></see> 类的新实例   
3/// </summary>

public SmtpMail()
{
SMTPCodeAdd();
}

#region Properties 定义属性
///

1<summary>   
2/// 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（ [email protected] ），我将尽快查明原因。   
3/// </summary>

public string Logs
{
get
{
return m_logs.ToString();
}
}

///

1<summary>   
2/// 最多收件人数量   
3/// </summary>

public int RecipientMaxNum
{
set
{
m_recipientMaxnum = value;
}
get
{
return m_recipientMaxnum;
}
}

///

1<summary>   
2/// 设定语言代码，默认设定为GB2312，如不需要可设置为""   
3/// </summary>

public string Charset
{
get
{
return this.m_charset;
}
set
{
this.m_charset = value;
}
}

///

1<summary>   
2/// 重复时间，以秒为单位   
3/// </summary>

public int RepeatTime
{
get {return m_RepeatTime;}
set {m_RepeatTime = value;}

}

///

1<summary>   
2/// 服务器出错或拒绝后的等待时间,以毫秒为单位   
3/// </summary>

public int WaitTime
{
get {return m_WaitTime;}
set {m_WaitTime = value > 10000?value:10000;}
}

#endregion

#region Methods 定义方法

///

1<summary>   
2/// 邮件服务器域名和验证信息   
3/// 形如："user:[email protected]:25"，也可省略次要信息。如"user:[email protected]"或" www.server.com "   
4/// </summary>

///

1<param name="mailDomain"/>

输入用户名、密码、邮件服务器域名、端口号
///

1<param name="mailServer"/>

返回邮件服务器域名
///

1<param name="mailServerUserName"/>

返回用户名
///

1<param name="password"/>

返回密码
///

1<param name="mailserverport"/>

返回端口号
///

1<param name="needSmtp"/>

返回是否需要SMTP验证
///

1<returns></returns>

private bool SetMailDomain(string mailDomain,out string mailServer,out string mailServerUserName,out string password,
out int mailserverport,out bool needSmtp)
{
bool isRight = false;
//为输出变量赋初值
mailServer = string.Empty;
mailServerUserName = String.Empty;
password = String.Empty;
mailserverport = 25;
needSmtp = false;

mailServer = mailDomain.Trim();
int tempint;
if( mailServer != "" )
{
tempint = mailServer.IndexOf("@");
isRight = true;
if(tempint!=-1)
{
string str = mailServer.Substring(0,tempint);
mailServerUserName = str.Substring(0,str.IndexOf(":"));
password = str.Substring(str.IndexOf(":")+1,str.Length-str.IndexOf(":")-1);
needSmtp = !(password==string.Empty);
mailServer = mailDomain.Substring(tempint+1,mailDomain.Length-tempint-1);
}

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

return isRight;
}

///

1<summary>   
2/// 添加邮件附件   
3/// </summary>

///

1<param name="filePath"/>

附件绝对路径
private IList AddAttachment(params string[] filePath)
{
if(filePath == null || filePath.Length == 0)
{
return null;
}
IList m_Attachments = new System.Collections.ArrayList();// 邮件附件列表
for(int i=0;i

  1<filepath.length;i++) <summary="" else="" if(file.exists(filepath[i]))="" m_attachments.add(filepath[i]);="" m_attachments;="" m_logs.append("错误：没找到文件名为"+filepath[i]+"的附件文件！"+enter);="" return="" {="" }="">   
  2/// 添加一组收件人（不超过m_recipientMaxnum个），参数为字符串数组   
  3///    
  4/// <param name="recipients"/>保存有收件人地址的字符串数组（不超过m_recipientMaxnum个）   
  5private Hashtable AddRecipient(params string[] recipients)   
  6{   
  7if(recipients==null || recipients.Length == 0)   
  8{   
  9return null;   
 10}   
 11Hashtable recipientList=new Hashtable();// 收件人列表 
 12
 13for(int i=0;i<recipients.length;i++) !="-1)" &&="" <summary="" if(recipient="" recipient="recipients[i].Trim();" recipient.indexof("@")="" recipientlist.add(recipientlist.count,recipients[i]);="" recipientlist;="" return="" string="" {="" }="">   
 14/// 发送邮件方法   
 15///    
 16/// <param name="smtpServer"/>smtp服务器信息，如"username:[email protected]:25"，也可去掉部分次要信息，如" www.smtpServer.com"   
 17/// <param name="from"/>发件人mail地址   
 18/// <param name="fromname"/>发件人姓名   
 19/// <param name="to"/>收件人地址列表   
 20/// <param name="toname"/>收件人姓名   
 21/// <param name="html"/>是否HTML邮件   
 22/// <param name="subject"/>邮件主题   
 23/// <param name="body"/>邮件正文   
 24/// <param name="filePath"/>邮件附件列表   
 25public bool Send(string smtpServer,string from,string fromName,string[] recipientADD,string recipientName,bool isHtml,string subject,Priority priority, string body,string[] filePath)   
 26{   
 27//如果收件人多于服务器可同时发送的最大值，则分多次发送   
 28if(recipientADD.Length &gt; RecipientMaxNum)   
 29{   
 30string[] recipientADD1 = new string[RecipientMaxNum];   
 31string[] recipientADD2 = new string[recipientADD.Length - RecipientMaxNum];   
 32for(int i = 0;i &lt; recipientADD.Length; i++)   
 33{   
 34if(i &lt; RecipientMaxNum)   
 35{   
 36recipientADD1[i] = recipientADD[i];   
 37}   
 38else   
 39{   
 40recipientADD2[i - RecipientMaxNum] = recipientADD[i];   
 41}   
 42}   
 43return Send(smtpServer,from,fromName,recipientADD1,recipientName,isHtml,subject,priority, body,filePath)   
 44&amp;&amp;   
 45Send(smtpServer,from,fromName,recipientADD2,recipientName,isHtml,subject,priority, body,filePath);   
 46} 
 47
 48if(m_logs.Length &gt; 2048)   
 49{   
 50m_logs.Remove(0,m_logs.Length);   
 51} 
 52
 53string mailServer="";// 邮件服务器域名   
 54int mailserverport=25;// 邮件服务器端口号   
 55string userName="";// SMTP认证时使用的用户名   
 56string password="";// SMTP认证时使用的密码   
 57bool needSmtp=false;// 是否需要SMTP验证   
 58SetMailDomain(smtpServer,out mailServer,out userName,out password,   
 59out mailserverport,out needSmtp);   
 60if(mailServer.Trim()=="")   
 61{   
 62m_logs.Append("必须指定SMTP服务器"+ENTER);   
 63return false;   
 64}   
 65IList attachments = AddAttachment(filePath);// 邮件附件列表   
 66Hashtable recipients = AddRecipient(recipientADD);// 收件人列表   
 67if(recipients == null || recipients.Count == 0 )   
 68{   
 69m_logs.Append("必须指定收件人"+ENTER);   
 70return false;   
 71}   
 72if(recipients.Count &gt; RecipientMaxNum)   
 73{   
 74m_logs.Append("一次发送的收件人太多"+ENTER);   
 75return false;   
 76}   
 77bool isSuccessful = false;   
 78lock(this)   
 79{   
 80TcpClient tcpClientObject = null;// TcpClient对象，用于连接服务器   
 81NetworkStream networkStreamObject = null;// NetworkStream对象   
 82DateTime dateTimeBegin = DateTime.Now;   
 83int useTime = 0;   
 84while(! ( useTime &gt; RepeatTime || isSuccessful))   
 85{   
 86try   
 87{   
 88tcpClientObject=new TcpClient(mailServer,mailserverport);   
 89networkStreamObject = tcpClientObject.GetStream();   
 90isSuccessful =SendEmail(networkStreamObject,needSmtp,mailServer,userName,password,recipients,from,   
 91fromName,recipientName,subject,priority.ToString(),attachments, isHtml, body);   
 92}   
 93catch(Exception e)   
 94{   
 95m_logs.Append("错误："+e.Message+ENTER);   
 96}   
 97finally   
 98{   
 99if(networkStreamObject!=null)networkStreamObject.Close();   
100if(tcpClientObject!=null)tcpClientObject.Close();   
101if(!isSuccessful)   
102{   
103string n = Thread.CurrentThread.Name;   
104Thread.Sleep(WaitTime);   
105}   
106useTime = ((TimeSpan)(DateTime.Now - dateTimeBegin)).Seconds;   
107}   
108}   
109}   
110return isSuccessful;   
111}   
112
113
114#endregion 
115
116#region Private Helper Functions 
117
118  
119/// <summary>   
120/// SMTP回应代码哈希表   
121/// </summary>   
122private void SMTPCodeAdd()   
123{   
124m_ErrCodeHT.Add("500","邮箱地址错误");   
125m_ErrCodeHT.Add("501","参数格式错误");   
126m_ErrCodeHT.Add("502","命令不可实现");   
127m_ErrCodeHT.Add("503","服务器需要SMTP验证");   
128m_ErrCodeHT.Add("504","命令参数不可实现");   
129m_ErrCodeHT.Add("421","服务未就绪，关闭传输信道");   
130m_ErrCodeHT.Add("450","要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）");   
131m_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）");   
132m_ErrCodeHT.Add("451","放弃要求的操作；处理过程中出错");   
133m_ErrCodeHT.Add("551","用户非本地，请尝试<forward-path>");   
134m_ErrCodeHT.Add("452","系统存储不足，要求的操作未执行");   
135m_ErrCodeHT.Add("552","过量的存储分配，要求的操作未执行");   
136m_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）");   
137m_ErrCodeHT.Add("432","需要一个密码转换");   
138m_ErrCodeHT.Add("534","认证机制过于简单");   
139m_ErrCodeHT.Add("538","当前请求的认证机制需要加密");   
140m_ErrCodeHT.Add("454","临时认证失败");   
141m_ErrCodeHT.Add("530","需要认证"); 
142
143m_RightCodeHT.Add("220","服务就绪");   
144m_RightCodeHT.Add("250","要求的邮件操作完成");   
145m_RightCodeHT.Add("251","用户非本地，将转发向<forward-path>");   
146m_RightCodeHT.Add("354","开始邮件输入，以<enter>.<enter>结束");   
147m_RightCodeHT.Add("221","服务关闭传输信道");   
148m_RightCodeHT.Add("334","服务器响应验证Base64字符串");   
149m_RightCodeHT.Add("235","验证成功");   
150} 
151
152  
153/// <summary>   
154/// 将字符串编码为Base64字符串   
155/// </summary>   
156/// <param name="str"/>要编码的字符串   
157private string Base64Encode(string str)   
158{   
159byte[] barray;   
160barray=Encoding.Default.GetBytes(str);   
161return Convert.ToBase64String(barray);   
162} 
163
164  
165/// <summary>   
166/// 将Base64字符串解码为普通字符串   
167/// </summary>   
168/// <param name="str"/>要解码的字符串   
169private string Base64Decode(string str)   
170{   
171byte[] barray;   
172barray=Convert.FromBase64String(str);   
173return Encoding.Default.GetString(barray);   
174} 
175
176  
177/// <summary>   
178/// 得到上传附件的文件流   
179/// </summary>   
180/// <param name="filePath"/>附件的绝对路径   
181private string GetStream(string filePath)   
182{   
183byte[] by = null;   
184System.IO.FileStream FileStr = null;   
185string streamString = "";   
186try   
187{   
188//建立文件流对象   
189FileStr=new System.IO.FileStream(filePath,System.IO.FileMode.Open);   
190by=new byte[System.Convert.ToInt32(FileStr.Length)];   
191FileStr.Read(by,0,by.Length);   
192streamString = System.Convert.ToBase64String(by);   
193}   
194catch(Exception ex)   
195{   
196//写错误日志   
197m_logs.Append("错误："+ex.Message+ENTER);   
198}   
199finally   
200{   
201if(FileStr != null)   
202{   
203FileStr.Close();   
204}   
205} 
206
207return streamString;   
208} 
209
210/// <summary>   
211/// 发送SMTP命令   
212/// </summary>   
213private bool SendCommand(string str,NetworkStream _NetworkStreamObject)   
214{   
215byte[] WriteBuffer;   
216if(str==null||str.Trim()==String.Empty)   
217{   
218return true;   
219}   
220m_logs.Append(str+ENTER);   
221WriteBuffer = Encoding.Default.GetBytes(str);   
222try   
223{   
224_NetworkStreamObject.Write(WriteBuffer,0,WriteBuffer.Length);   
225}   
226catch(Exception ex)   
227{   
228//写日志   
229m_logs.Append("错误："+ex.Message+ENTER);   
230return false;   
231}   
232return true;   
233} 
234
235/// <summary>   
236/// 接收SMTP服务器回应   
237/// </summary>   
238private string RecvResponse(NetworkStream _NetworkStreamObject)   
239{   
240int StreamSize = 0;   
241string ReturnValue = String.Empty;   
242byte[] ReadBuffer = new byte[1024] ;   
243try   
244{   
245StreamSize = _NetworkStreamObject.Read(ReadBuffer,0,ReadBuffer.Length);   
246}   
247catch(Exception ex)   
248{   
249//写日志   
250m_logs.Append("错误："+ex.Message+ENTER);   
251m_ErrCode = ex.Message;   
252return "false";   
253} 
254
255if (StreamSize==0)   
256{   
257return ReturnValue ;   
258}   
259else   
260{   
261ReturnValue = Encoding.Default.GetString(ReadBuffer).Substring(0,StreamSize);   
262m_logs.Append(ReturnValue+ENTER);   
263return ReturnValue;   
264}   
265} 
266
267/// <summary>   
268/// 与服务器交互，发送一条命令并接收回应。   
269/// </summary>   
270/// <param name="str"/>一个要发送的命令   
271private bool Dialog(string str,NetworkStream _NetworkStream)   
272{   
273if(str==null||str.Trim()=="")   
274{   
275return true;   
276}   
277if(SendCommand(str,_NetworkStream))   
278{   
279string RR=RecvResponse(_NetworkStream);   
280if(RR=="false")   
281{   
282return false;   
283}   
284string RRCode=RR.Substring(0,3);   
285if(m_RightCodeHT[RRCode]!=null)   
286{   
287return true;   
288}   
289else   
290{   
291m_ErrCode = RRCode;   
292return false;   
293}   
294}   
295else   
296{   
297return false;   
298} 
299
300} 
301
302  
303/// <summary>   
304/// 与服务器交互，发送一组命令并接收回应。   
305/// </summary>
306
307private bool Dialog(string[] str,NetworkStream _NetworkStream)   
308{   
309for(int i=0;i<str.length;i++) <summary="" false;="" if(!dialog(str[i],_networkstream))="" return="" true;="" {="" }="">   
310/// SendEmail   
311///    
312/// <returns></returns>   
313private bool SendEmail(NetworkStream _NetworkStream,bool needSmtp,string mailServer,string userName,string password,Hashtable recipients,string from,   
314string fromName,string recipientName,string subject,string priority,IList attachments,bool isHtml,   
315string body)   
316{   
317//验证网络连接是否正确   
318if(m_RightCodeHT[RecvResponse(_NetworkStream).Substring(0,3)]==null)   
319{   
320return false;   
321} 
322
323  
324string[] SendBuffer;   
325string SendBufferstr;   
326StringBuilder SendBufferstrBuilder = new StringBuilder(); 
327
328//进行SMTP验证   
329if(needSmtp)   
330{   
331SendBuffer=new String[4];   
332SendBuffer[0]="EHLO " + mailServer + ENTER;   
333SendBuffer[1]="AUTH LOGIN" + ENTER;   
334SendBuffer[2]=Base64Encode(userName) + ENTER;   
335SendBuffer[3]=Base64Encode(password) + ENTER;   
336if(!Dialog(SendBuffer,_NetworkStream))   
337{   
338return false;   
339}   
340}   
341else   
342{   
343SendBufferstr="HELO " + mailServer + ENTER;   
344if(!Dialog(SendBufferstr,_NetworkStream))   
345return false;   
346} 
347
348//   
349SendBufferstr="MAIL FROM:&lt;" + from + "&gt;" + ENTER;   
350if(!Dialog(SendBufferstr,_NetworkStream))   
351return false; 
352
353//   
354SendBuffer=new string[m_recipientMaxnum];   
355for(int i=0;i<recipients.count;i++) +="" +"="" recipients[i].tostring()="" sendbuffer[i]="RCPT TO:&lt;" {="">" + ENTER; 
356
357} 
358
359if(!Dialog(SendBuffer,_NetworkStream))   
360return false;   
361SendBufferstr="DATA" + ENTER;   
362if(!Dialog(SendBufferstr,_NetworkStream))   
363return false; 
364
365SendBufferstrBuilder.Append("From:" + fromName + "&lt;" + from +"&gt;" +ENTER);   
366  
367SendBufferstrBuilder.Append("To:=?"+Charset.ToUpper()+"?B?"+Base64Encode(recipientName)+"?="+"&lt;"+recipients[0]+"&gt;"+ENTER);   
368  
369SendBufferstrBuilder.Append("CC:");   
370for(int i=0;i<recipients.count;i++) "<"="" +="" +"="" recipients[i].tostring()="" sendbufferstrbuilder.append(recipients[i].tostring()="" {="">,");   
371}   
372SendBufferstrBuilder.Append(ENTER); 
373
374SendBufferstrBuilder.Append(((subject==String.Empty || subject==null)?"Subject:":((Charset=="")?("Subject:" + subject):("Subject:" + "=?" + Charset.ToUpper() + "?B?" + Base64Encode(subject) +"?="))) + ENTER);   
375SendBufferstrBuilder.Append("X-Priority:" + priority + ENTER);   
376SendBufferstrBuilder.Append("X-MSMail-Priority:" + priority + ENTER);   
377SendBufferstrBuilder.Append("Importance:" + priority + ENTER);   
378SendBufferstrBuilder.Append("X-Mailer: Lion.Web.Mail.SmtpMail Pubclass [cn]" + ENTER);   
379SendBufferstrBuilder.Append("MIME-Version: 1.0" + ENTER); 
380
381if(attachments != null &amp;&amp; attachments.Count!=0)   
382{   
383SendBufferstrBuilder.Append("Content-Type: multipart/mixed;" + ENTER);   
384SendBufferstrBuilder.Append(" boundary=\"====="+(isHtml?"001_Dragon520636771063_":"001_Dragon303406132050_")+"=====\""+ENTER+ENTER);   
385} 
386
387if(isHtml)   
388{   
389if(attachments != null &amp;&amp; attachments.Count==0)   
390{   
391SendBufferstrBuilder.Append("Content-Type: multipart/alternative;"+ENTER);//内容格式和分隔符   
392SendBufferstrBuilder.Append(" boundary=\"=====003_Dragon520636771063_=====\""+ENTER+ENTER); 
393
394SendBufferstrBuilder.Append("This is a multi-part message in MIME format."+ENTER+ENTER);   
395}   
396else   
397{   
398SendBufferstrBuilder.Append("This is a multi-part message in MIME format."+ENTER+ENTER);   
399SendBufferstrBuilder.Append("--=====001_Dragon520636771063_====="+ENTER);   
400SendBufferstrBuilder.Append("Content-Type: multipart/alternative;"+ENTER);//内容格式和分隔符   
401SendBufferstrBuilder.Append(" boundary=\"=====003_Dragon520636771063_=====\""+ENTER+ENTER);   
402}   
403SendBufferstrBuilder.Append("--=====003_Dragon520636771063_====="+ENTER);   
404SendBufferstrBuilder.Append("Content-Type: text/plain;"+ ENTER);   
405SendBufferstrBuilder.Append(((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" + Charset.ToLower() + "\"")) + ENTER);   
406SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64" + ENTER + ENTER);   
407SendBufferstrBuilder.Append(Base64Encode("邮件内容为HTML格式，请选择HTML方式查看") + ENTER + ENTER); 
408
409SendBufferstrBuilder.Append("--=====003_Dragon520636771063_====="+ENTER); 
410
411SendBufferstrBuilder.Append("Content-Type: text/html;" + ENTER);   
412SendBufferstrBuilder.Append(((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" + Charset.ToLower() + "\"")) + ENTER);   
413SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64" + ENTER + ENTER);   
414SendBufferstrBuilder.Append(Base64Encode(body) + ENTER + ENTER);   
415SendBufferstrBuilder.Append("--=====003_Dragon520636771063_=====--"+ENTER);   
416}   
417else   
418{   
419if(attachments != null &amp;&amp; attachments.Count!=0)   
420{   
421SendBufferstrBuilder.Append("--=====001_Dragon303406132050_====="+ENTER);   
422}   
423SendBufferstrBuilder.Append("Content-Type: text/plain;" + ENTER);   
424SendBufferstrBuilder.Append(((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" + Charset.ToLower() + "\"")) + ENTER);   
425SendBufferstrBuilder.Append("Content-Transfer-Encoding: base64" + ENTER + ENTER);   
426SendBufferstrBuilder.Append(Base64Encode(body) + ENTER);   
427}   
428  
429//SendBufferstr += "Content-Transfer-Encoding: base64"+ENTER;   
430if(attachments != null &amp;&amp; attachments.Count!=0)   
431{   
432for(int i=0;i<attachments.count;i++) "."="" #endregion="" #region="" );="" *="" +="" +"='--"+ENTER+ENTER);' 001_dragon520636771063_":"001_dragon303406132050_")="" <summary="" \\\")+1))+"?='\""+ENTER+ENTER' application="" attachment;"+enter);="" base64"+enter);="" content-type:="" enter);="" enter;="" false;="" filename='\"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("' filepath="(string)attachments[i];" if(!dialog(sendbufferstr,_networkstream))="" name='\"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("' octet-stream"+enter;="" plain;"+enter);="" return="" sendbufferstr="QUIT" sendbufferstrbuilder.append("="" sendbufferstrbuilder.append("--="+ (isHtml?" sendbufferstrbuilder.append("content-disposition:="" sendbufferstrbuilder.append("content-transfer-encoding:="" sendbufferstrbuilder.append("content-type:="" sendbufferstrbuilder.append(enter="" sendbufferstrbuilder.append(getstream(filepath)+enter+enter);="" string="" text="" true;="" {="" }="">   
433/// 添加一个密件收件人   
434///    
435/// <param name="str"/>收件人地址   
436public bool AddRecipientBCC(string str)   
437{   
438if(str==null||str.Trim()=="")   
439return true;   
440if(RecipientBCCNum&lt;10)   
441{   
442RecipientBCC.Add(RecipientBCCNum,str);   
443RecipientBCCNum++;   
444return true;   
445}   
446else   
447{   
448m_logs.Append("错误：收件人过多");   
449return false;   
450}   
451} 
452
453  
454/// <summary>   
455/// 添加一组密件收件人（不超过10个），参数为字符串数组   
456/// </summary>   
457/// <param name="str"/>保存有收件人地址的字符串数组（不超过10个）   
458public bool AddRecipientBCC(string[] str)   
459{   
460for(int i=0;i<str.length;i++) #endregion="" *="" <summary="" false;="" if(!addrecipientbcc(str[i]))="" return="" true;="" {="" }="">   
461/// 邮件发送优先级   
462///    
463public enum Priority   
464{   
465High,   
466Normal,   
467Low   
468} 
469
470#endregion 
471
472}</str.length;i++)></attachments.count;i++)></recipients.count;i++)></recipients.count;i++)></str.length;i++)></enter></enter></forward-path></forward-path></recipients.length;i++)></filepath.length;i++)>
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