POP3 клиент quoted-printable декодирование - C#

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Формулировка задачи:

Никто не знает? Ну ладно. А как перекодировать из Quoted Printable в нормальный вид? Я использовал следующую конструкцию:
Листинг программы 
  1. public static string GetDecodeString(string mimeString)
  2.         {
  3.             var regex = new Regex(@"=\?(?<charset>.*?)\?(?<encoding>[qQbB])\?(?<value>.*?)\?=");
  4.             var encodedString = mimeString;
  5.             var decodedString = string.Empty;
  6.  
  7.             while (encodedString.Length > 0)
  8.             {
  9.                 var match = regex.Match(encodedString);
  10.                 if (match.Success)
  11.                 {
  12.                     // If the match isn't at the start of the string, copy the initial few chars to the output
  13.                     decodedString += encodedString.Substring(0, match.Index);
  14.  
  15.                     var charset = match.Groups["charset"].Value;
  16.                     var encoding = match.Groups["encoding"].Value.ToUpper();
  17.                     var value = match.Groups["value"].Value;
  18.  
  19.                     if (encoding.Equals("B"))
  20.                     {
  21.                         // Encoded value is Base-64
  22.                         var bytes = Convert.FromBase64String(value);
  23.                         decodedString += Encoding.GetEncoding(charset).GetString(bytes);
  24.                     }
  25.                     else if (encoding.Equals("Q"))
  26.                     {
  27.                         // Encoded value is Quoted-Printable
  28.                         // Parse looking for =XX where XX is hexadecimal
  29.                         var regx = new Regex("(\\=([0-9A-F][0-9A-F]))", RegexOptions.IgnoreCase);
  30.                         decodedString += regx.Replace(value, new MatchEvaluator(delegate(Match m)
  31.                         {
  32.                             byte[] bytes = new byte[m.Value.Length / 3];
  33.  
  34.                             for (int i = 0; i < bytes.Length; i++)
  35.                             {
  36.                                 string hex = m.Value.Substring(i * 3 + 1, 2);
  37.                                 int iHex = Convert.ToInt32(hex, 16);
  38.                                 bytes[i] = Convert.ToByte(iHex);
  39.                             }
  40.                             return Encoding.GetEncoding(charset).GetString(bytes);
  41.                         }));
  42.                         decodedString = decodedString.Replace('_', ' ');
  43.                     }
  44.                     else
  45.                     {
  46.                         // Encoded value not known, return original string
  47.                         // (Match should not be successful in this case, so this code may never get hit)
  48.                         decodedString += encodedString;
  49.                         break;
  50.                     }
  51.  
  52.                     // Trim off up to and including the match, then we'll loop and try matching again.
  53.                     encodedString = encodedString.Substring(match.Index + match.Length + 1);
  54.                 }
  55.                 else
  56.                 {
  57.                     // No match, not encoded, return original string
  58.                     decodedString += encodedString;
  59.                     break;
  60.                 }
  61.             }
  62.             return decodedString;
  63.         }
Вызывал и записывал в файл так:
Листинг программы 
  1. using (StreamReader reader = new StreamReader(@"C:\" + filename+".txt"))
  2.                     {
  3.                         string str = RegexDecode.DecodeEncodedWordValue(reader.ReadToEnd());
  4.                         string filenameDecode = @"TempMessageFileDecode" + i.ToString();
  5.                         pop3.SaveToFile(str, @"C:\", filenameDecode);
  6.                     }
А в файле с вложением отобразилось вот так:
Листинг программы 
  1. Return-Path: <test@domain.local>
  2. Received: from st41nb ([192.168.191.248])
  3. by [192.168.191.248] (Courier Mail Server 2.10) with ESMTP id 00500001
  4. for <csti@domain.local>; Mon, 15 Aug 2011 13:10:47 +0400
  5. From: "Ilyasov" <test@domain.local>
  6. To: <csti@domain.local>
  7. Subject: FW: Калуга_газ_без расхода
  8. Date: Mon, 15 Aug 2011 13:10:47 +0400
  9. Message-ID: <000001cc5b2b$3867a660$a936f320$@local>
  10. MIME-Version: 1.0
  11. Content-Type: multipart/mixed;
  12. boundary="----=_NextPart_000_0001_01CC5B4C.BF794660"
  13. X-Mailer: Microsoft Office Outlook 12.0
  14. Thread-Index: AcxbEHnrAGcNB+GZTWKq+UW7nFwCZAAGreLw
  15. Content-Language: ru
  16.  
  17. This is a multi-part message in MIME format.
  18.  
  19. ------=_NextPart_000_0001_01CC5B4C.BF794660
  20. Content-Type: multipart/alternative;
  21. boundary="----=_NextPart_001_0002_01CC5B4C.BF794660"
  22.  
  23. ------=_NextPart_001_0002_01CC5B4C.BF794660
  24. Content-Type: text/plain;
  25. charset="koi8-r"
  26. Content-Transfer-Encoding: quoted-printable
  27.  
  28. =20
  29.  
  30. =20
  31.  
  32. From: removed@mail.ru [mailto:removed@mail.ru]=20
  33. Sent: Monday, August 15, 2011 9:59 AM
  34. To: removed@mail.ru
  35. Subject: =EB=C1=CC=D5=C7=C1_=C7=C1=DA_=C2=C5=DA =D2=C1=D3=C8=CF=C4=C1
  36.  
  37. =20
  38.  
  39. =20
  40.  
  41. ------=_NextPart_001_0002_01CC5B4C.BF794660
  42. Content-Type: text/html;
  43. charset="koi8-r"
  44. Content-Transfer-Encoding: quoted-printable
  45.  
  46. <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
  47. charset=3Dkoi8-r">
  48. <html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
  49. xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
  50. xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
  51. xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
  52. xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta name=3DGenerator =
  53. content=3D"Microsoft Word 12 (filtered medium)"><style><!--
  54. /* Font Definitions */
  55. @font-face
  56. {font-family:Calibri;
  57. panose-1:2 15 5 2 2 2 4 3 2 4;}
  58. @font-face
  59. {font-family:Tahoma;
  60. panose-1:2 11 6 4 3 5 4 4 2 4;}
  61. /* Style Definitions */
  62. p.MsoNormal, li.MsoNormal, div.MsoNormal
  63. {margin:0cm;
  64. margin-bottom:.0001pt;
  65. font-size:11.0pt;
  66. font-family:"Calibri","sans-serif";}
  67. a:link, span.MsoHyperlink
  68. {mso-style-priority:99;
  69. color:blue;
  70. text-decoration:underline;}
  71. a:visited, span.MsoHyperlinkFollowed
  72. {mso-style-priority:99;
  73. color:purple;
  74. text-decoration:underline;}
  75. span.EmailStyle17
  76. {mso-style-type:personal-reply;
  77. font-family:"Calibri","sans-serif";
  78. color:#1F497D;}
  79. ..MsoChpDefault
  80. {mso-style-type:export-only;}
  81. @page WordSection1
  82. {size:612.0pt 792.0pt;
  83. margin:2.0cm 42.5pt 2.0cm 3.0cm;}
  84. div.WordSection1
  85. {page:WordSection1;}
  86. --></style><!--[if gte mso 9]><xml>
  87. <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
  88. </xml><![endif]--><!--[if gte mso 9]><xml>
  89. <o:shapelayout v:ext=3D"edit">
  90. <o:idmap v:ext=3D"edit" data=3D"1" />
  91. </o:shapelayout></xml><![endif]--></head><body lang=3DRU link=3Dblue =
  92. vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
  93. style=3D'color:#1F497D'><o:p> </o:p></span></p><p =
  94. class=3DMsoNormal><span =
  95. style=3D'color:#1F497D'><o:p> </o:p></span></p><div =
  96. style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
  97. 0cm 0cm'><p class=3DMsoNormal><b><span =
  98. style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
  99. </b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
  100. removed@mail.ru [mailto:removed@mail.ru] =
  101. <br><b>Sent:</b> Monday, August 15, 2011 9:59 AM<br><b>To:</b> =
  102. removed@mail.ru<br><b>Subject:</b> =
  103. =EB=C1=CC=D5=C7=C1_=C7=C1=DA_=C2=C5=DA =
  104. =D2=C1=D3=C8=CF=C4=C1<o:p></o:p></span></p></div><p =
  105. class=3DMsoNormal><o:p> </o:p></p><p =
  106. class=3DMsoNormal><o:p> </o:p></p></div></body></html>
  107. ------=_NextPart_001_0002_01CC5B4C.BF794660--
  108.  
  109. ------=_NextPart_000_0001_01CC5B4C.BF794660
  110. Content-Type: application/octet-stream;
  111. name="310244_51401.110815"
  112. Content-Transfer-Encoding: quoted-printable
  113. Content-Disposition: attachment;
  114. filename="310244_51401.110815"
  115.  
  116. CP866_404
  117. //51401:1108:310244:15:4::++
  118. (20):::::::2479::::2479::
  119. (2000003)::02 5211:706:20:::2479::::2479::
  120. =3D=3D
  121. ##15.08.2011
  122. ##
  123. ##=C2=E5=F0=F1=E8=FF ARM_Maker - 4.4.8
  124. ##
  125. ##
  126. ##
  127.  
  128. ------=_NextPart_000_0001_01CC5B4C.BF794660
  129. Content-Type: application/octet-stream;
  130. name="310244_51401.110811"
  131. Content-Transfer-Encoding: quoted-printable
  132. Content-Disposition: attachment;
  133. filename="310244_51401.110811"
  134.  
  135. CP866_404
  136. //51401:1108:310244:11:4::++
  137. (20):::::::2479::::2479::
  138. (2000003)::02 5211:706:20:::2479::::2479::
  139. =3D=3D
  140. ##15.08.2011
  141. ##
  142. ##=C2=E5=F0=F1=E8=FF ARM_Maker - 4.4.8
  143. ##
  144. ##
  145. ##
  146.  
  147. ------=_NextPart_000_0001_01CC5B4C.BF794660
  148. Content-Type: application/octet-stream;
  149. name="310244_51401.110812"
  150. Content-Transfer-Encoding: quoted-printable
  151. Content-Disposition: attachment;
  152. filename="310244_51401.110812"
  153.  
  154. CP866_404
  155. //51401:1108:310244:12:4::++
  156. (20):::::::2479::::2479::
  157. (2000003)::02 5211:706:20:::2479::::2479::
  158. =3D=3D
  159. ##15.08.2011
  160. ##
  161. ##=C2=E5=F0=F1=E8=FF ARM_Maker - 4.4.8
  162. ##
  163. ##
  164. ##
  165.  
  166. ------=_NextPart_000_0001_01CC5B4C.BF794660
  167. Content-Type: application/octet-stream;
  168. name="310244_51401.110813"
  169. Content-Transfer-Encoding: quoted-printable
  170. Content-Disposition: attachment;
  171. filename="310244_51401.110813"
  172.  
  173. CP866_404
  174. //51401:1108:310244:13:4::++
  175. (20):::::::2479::::2479::
  176. (2000003)::02 5211:706:20:::2479::::2479::
  177. =3D=3D
  178. ##15.08.2011
  179. ##
  180. ##=C2=E5=F0=F1=E8=FF ARM_Maker - 4.4.8
  181. ##
  182. ##
  183. ##
  184.  
  185. ------=_NextPart_000_0001_01CC5B4C.BF794660
  186. Content-Type: application/octet-stream;
  187. name="310244_51401.110814"
  188. Content-Transfer-Encoding: quoted-printable
  189. Content-Disposition: attachment;
  190. filename="310244_51401.110814"
  191.  
  192. CP866_404
  193. //51401:1108:310244:14:4::++
  194. (20):::::::2479::::2479::
  195. (2000003)::02 5211:706:20:::2479::::2479::
  196. =3D=3D
  197. ##15.08.2011
  198. ##
  199. ##=C2=E5=F0=F1=E8=FF ARM_Maker - 4.4.8
  200. ##
  201. ##
  202. ##
  203.  
  204. ------=_NextPart_000_0001_01CC5B4C.BF794660--
Почему не декодировалось? Облазил все, что можно((( Подскажите, что делать - сроки поджимают.

Решение задачи: «POP3 клиент quoted-printable декодирование»

textual
Листинг программы 
  1. Attachment attachment = Attachment.CreateAttachmentFromString("", "=?utf-8?Q?=D0=9F=D0=B0=D0=BA=D0=B5=D1=82=5F=D0=BE=D1=82=D1=87=D0=B5=D1=82=D0=BD=D0=BE=D1=81=D1=82?=");
  2. Console.WriteLine(attachment.Name);

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