.NET接收邮件下载邮件附件——openpop.net

使用OpenPop.Net接收邮件很方便，下面是接收下载邮件附件的代码

OpenPop.Net下载地址 https://sourceforge.net/projects/hpop/

     public class EmailHelper
     {
         private string accout; //邮箱账户
         private string pass;//邮箱密码
         private string popServer; //pop服务地址(阿里云：pop3.mxhichina.com)
         private int popPort; //pop服务端口号（110）
         private bool isUseSSL;

         public EmailHelper(string _accout, string _pass, string _popServer, int _popPort, bool _isUseSSL)
         {
             this.accout = _accout;
             this.pass = _pass;
             this.popServer = _popServer;
             this.popPort = _popPort;
             this.isUseSSL = _isUseSSL;
         }

         #region 验证邮箱是否登录成功
         public bool ValidateAccount(ref string error)
         {
             Pop3Client client = new Pop3Client();
             try
             {
                 client.Connect(popServer, popPort, isUseSSL);
                 client.Authenticate(accout, pass);
             }
             catch (InvalidLoginException ex)
             {
                 error = "邮箱登录失败！";
                 return false;
             }
             catch (InvalidUseException ex)
             {
                 error = "邮箱登录失败！";
                 return false;
             }
             catch (PopServerNotFoundException ex)
             {
                 error = "服务器没有找到！";
                 return false;
             }
             catch (PopServerException ex)
             {
                 error = "请在邮箱开通POP3/SMTP！";
                 return false;
             }
             catch (Exception ex)
             {
                 error = "连接出现异常";
                 return false;
             }
             finally
             {
                 client.Disconnect();
             }
             return true;
         }
         #endregion

         # region 下载邮件附件
         /// <summary>
         /// 下载邮件附件
         /// </summary>
         public void DownAttachments(string path)
         {
             using (Pop3Client client = new Pop3Client())
             {
                 if (client.Connected)
                 {
                     client.Disconnect();
                 }
                 client.Connect(popServer, popPort, isUseSSL);
                 client.Authenticate(accout, pass, AuthenticationMethod.UsernameAndPassword);
                 int messageCount = client.GetMessageCount();
                 StringBuilder strBuilder = new StringBuilder();
                 int count = Convert.ToInt32(SqlHelper.ExecuteScalar("SELECT COUNT(1) FROM EmailList"));
                 int i = ;
                 for (i = count + ; i <= messageCount; i++)
                 {
                     Message message = client.GetMessage(i);
                     string senders = message.Headers.From.DisplayName;
                     string from = message.Headers.From.Address;
                     string subject = message.Headers.Subject;
                     DateTime Datesent = message.Headers.DateSent;

                     List<MessagePart> messageParts = message.FindAllAttachments();
                     foreach (var item in messageParts)
                     {
                         if (item.IsAttachment)
                         {
                             if (!File.Exists(path + item.FileName))
                             {
                                 if (item.FileName.Contains(".zip") || item.FileName.Contains(".rar"))
                                     File.WriteAllBytes(path + item.FileName, item.Body);
                             }
                         }
                     }

                     strBuilder.Append("INSERT INTO [dbo].[EmailList]([Title],[FromAdd],[Time],[isFlag]) VALUES (");
                     strBuilder.Append("'" + subject + "'," + "'" + from + "'," + "'" + Datesent.ToString("yyyy-MM-dd HH:mm:ss") + "'," + );
                     strBuilder.Append(")");
                     SqlHelper.ExecuteNonQuery(strBuilder.ToString());
                     strBuilder.Clear();

                 }
             }
         }
         #endregion

         #region 下载邮件附件
         /// <summary>
         /// 下载邮件附件
         /// </summary>
         public void DownAttachmentsById(string path, int messageId)
         {
             using (Pop3Client client = new Pop3Client())
             {
                 if (client.Connected)
                 {
                     client.Disconnect();
                 }
                 client.Connect(popServer, popPort, isUseSSL);
                 client.Authenticate(accout, pass, AuthenticationMethod.UsernameAndPassword);
                 Message message = client.GetMessage(messageId);
                 string senders = message.Headers.From.DisplayName;
                 string from = message.Headers.From.Address;
                 string subject = message.Headers.Subject;
                 DateTime Datesent = message.Headers.DateSent;

                 List<MessagePart> messageParts = message.FindAllAttachments();
                 foreach (var item in messageParts)
                 {
                     if (item.IsAttachment)
                     {
                         if (!File.Exists(path + item.FileName))
                         {
                             if (item.FileName.Contains(".zip") || item.FileName.Contains(".rar"))
                                 File.WriteAllBytes(path + item.FileName, item.Body);
                         }
                     }
                 }

                 MessagePart nomessageParts = message.FindFirstHtmlVersion();
                 string html = nomessageParts.GetBodyAsText();
                 Regex reg = new Regex(@"(?is)<a[^>]*?href=(['""]?)(?<url>[^'""\s>]+)\1[^>]*>(?<text>(?:(?!</?a\b).)*)</a>");
                 MatchCollection mc = reg.Matches(html);
                 string url = string.Empty;

                 url = mc[].Groups["url"].Value;
                 HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
                 req.Method = "GET";
                 using (WebResponse res = req.GetResponse())
                 {
                     string reader = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("utf-8")).ReadToEnd();
                     MatchCollection ms = reg.Matches(reader);
                     url = ms[].Groups["url"].Value;
                 }
             }
         }
         #endregion

         #region
         /// <summary>
         /// 获取邮件数量
         /// </summary>
         /// <returns></returns>
         public int GetEmailCount()
         {
             int messageCount = ;
             using (Pop3Client client = new Pop3Client())
             {
                 if (client.Connected)
                 {
                     client.Disconnect();
                 }
                 client.Connect(popServer, popPort, isUseSSL);
                 client.Authenticate(accout, pass, AuthenticationMethod.UsernameAndPassword);
                 messageCount = client.GetMessageCount();
             }

             return messageCount;
         }
         #endregion

     }