请教C#读取POP3邮件后，怎么获取正文的内容

邮件乱码目前在用C#写一个收POP3服务器上邮件的小程序用RETR命令获取邮件的全部文本后，发现正文内容为乱码，不知如何转换成中文内容下图为邮件文本另存为.eml后用outlook打开所呈现的下面的内容是邮件的全部文本 +OK Received: from ptr-smtp-01.ptr.petrochina ([10.27.132.76]) by XN-MAIL-01.ptr.petrochina with Microsoft SMTPSVC(6.0.3790.4675); Wed, 13 Aug 2014 16:07:14 +0800 Received: from mx1.cnpc.com.cn ([10.27.132.110]) by ptr-smtp-01.ptr.petrochina with Microsoft SMTPSVC(6.0.3790.4675); Wed, 13 Aug 2014 16:07:13 +0800 X-AuditID: 0a1b846e-b7fd06d000000ecd-ff-53eb1cb1e402 Received: from smtpbg334.qq.com (smtpbg334.qq.com [14.17.43.229]) by mx1.cnpc.com.cn (cnpc mail system) with SMTP id 6B.7B.03789.1BC1BE35; Wed, 13 Aug 2014 16:07:13 +0800 (HKT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qq.com; s=s201307; t=1407917233; bh=BtSFFp/vWU1EFIKVKndgjUkj16t70OLpso48T1gkQj8=; h=X-QQ-FEAT:X-QQ-SSF:X-HAS-ATTACH:X-QQ-BUSINESS-ORIGIN: X-Originating-IP:X-QQ-STYLE:X-QQ-mid:From:To:Subject:Mime-Version:Content-Type:Content-Transfer-Encoding:Date: X-Priority:Message-ID:X-QQ-MIME:X-Mailer:X-QQ-Mailer: X-QQ-SENDSIZE; b=aheMA3y/Wof9nu8vFjagzzVxIT0arPGsJQfCVzed+RpU0SGWnbuP8aNy64Dgr136t EyHrv7+adVH+CXX9e2K71jDvt87hLe3xDfkl5hK9LoBEuGer4IC7al9OWAdNylbQfx AYwgksoVd9309S3r/UoqQyeSUIB9ZRoC1ikyQ8MM= X-QQ-FEAT: zaIfg0hwV2rILZvaZFWuYz4JaX99GOX45n7TdnPKc9w= X-QQ-SSF: 00010000000000F000000000000000Z X-HAS-ATTACH: no X-QQ-BUSINESS-ORIGIN: 2 X-Originating-IP: 218.70.88.180 X-QQ-STYLE: X-QQ-mid: webmail419t1407917232t7438895 From: “=?gb18030?B?bmV2ZXI=?=” <29995136@qq.com> To: “=?gb18030?B?Y2hlbnNoYWxpbg==?=” <chenshalin@petrochina.com.cn> Subject: =?gb18030?B?0ru12NTa0qq5pA==?= Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=”—-=_NextPart_53EB1CB0_0911E318_0BCA4BD4″ Content-Transfer-Encoding: 8Bit Date: Wed, 13 Aug 2014 16:07:12 +0800 X-Priority: 3 Message-ID: <tencent_4D1998E81D9B2717091808B2@qq.com> X-QQ-MIME: TCMime 1.0 by Tencent X-Mailer: QQMail 2.x X-QQ-Mailer: QQMail 2.x X-QQ-SENDSIZE: 520 X-Brightmail-Tracker: H4sIAAAAAAAAA11Uf1AUZRjmuz1ggft02YPj5QCDKyaUmPBH5WjjMDY4/dOMM5f9YTW4wMpd HAdze4fQNA0BKeAgJUhyCKmDEwmGwA1dI2od03BiICBTCklJQghlKqGAObXf3R4s/ffM87z7 Pu/zvt8sTbHFIVqaL7DyFjNn0gUEK9eEJk4mtUfP6pOHOxK2OuvnFSno9fKKL9FutDf41Uze ZMznLS/u2BdsaOrpUuTVUgWV926iIjSpqEBBNDBb4MynRUov1sDgeFsAwSzTgeBKWyTBSuaC Ej47keCteQWOjTX7e/F6KHFcoLyYAfdQndQzAk733kJe/Ax0NtsDvVgF3xy5L3rRIn4epoo0 hA5gkuFc0wPPCGHMa9A4uoRIiVos6XWnEYiZUHjqVBNIMW/DL12eYkrsXV11h/LOGA/Vji7J B8PxQ5OeGsy8BN/VHpPyxcLFgRoJh0HL1PnleR//1Sp9y8JIWTP6BIF9xdi+YmyXGXtxEszO /RHoxXFQc/i2hF8A99NBJOdPosCzaG2GOS8jScjgzGbekpS8sQOJRwyOKjU70fCZ7S7E0Ein wtPPzehZfy5fKMxxoWxaoQvHwwsitSY9N7PQwAmGNIvNxAu6MHxqq0jjZTrdZsrWafG1qFk9 q15mzfwBwcRbxVejW4d37p/WsxHLmmAT8owZxlybkGazmFwIaEpsm+IgbTO5wvd5S67XzIWi aKUuArc4b+pZJouz8tk8n8dbfKqCDnShEnFVzNjReTvSKs25Zl4HeAeZJdTCZ/EF+40mq+8D sVMgKyqMXPGMH4M/+FN018gFWYI4XEoSaOXy/0Mo6CAXyqJVYpJsYo+FPC5HMGZJ1mqcfEN0 UPlYj20kdoJYyvpImWUMTiCWGp+02q4PfYzo05fvHlawnszaCKwkpgwpN9jMy5G1Grxne5ee XSsTiLU2Gm97z61nw2X8irs2FicTNVKmrh7A9x8YRjFaNUZ+fn6sSjxMjtEq5ZX0GTSKxOel xg4ynspotq6shMXdJH2IRHo2AvhuJLmdxMkWEo2LGVEJl5TV42yy0YhRw/SThhzoqGrvR1Az fHZAAW2XK24pYLytr46CxuKx3yhwdo+cV0J36cRP/nCtzDVDQ/uVpfog+P7GWFcQtPy41BcC tx93/h4Ch6qfPAyB/qm6ShU86ilrV4HzUmc5hokfqr7A8G3d9X48Ix5cIR68M5U8XcHKWeUH /yjVc3CJlQ5eSkjWR646+EEiaXzS6oDaIpTuXNi9beDrq7F+8c86hubu+Bkrm3Y23Dtq+PD4 kfLE+F9b331QtqtnIbFkZDR183VLbMGjl9/8p696z/2/NVPFlx5upuuDL7qHUk4ONqhKHVO9 +z43nes4cFXTuLguzp2vGv95fmTD9BzFMYtMUu/cW62j79T+u2txy4m9E28cPPXVprL1OqVg 4DZuoCwC9x814rgBFQYAAA== Return-Path: 29995136@qq.com X-OriginalArrivalTime: 13 Aug 2014 08:07:13.0418 (UTC) FILETIME=[96F456A0:01CFB6CD] This is a multi-part message in MIME format. ——=_NextPart_53EB1CB0_0911E318_0BCA4BD4 Content-Type: text/plain; charset=”gb18030″ Content-Transfer-Encoding: base64 yc/Kx9bQufrNrA== ——=_NextPart_53EB1CB0_0911E318_0BCA4BD4 Content-Type: text/html; charset=”gb18030″ Content-Transfer-Encoding: base64 PERJVj7Jz8rH1tC5+s2sPC9ESVY+ ——=_NextPart_53EB1CB0_0911E318_0BCA4BD4– 请高要指点一下怎么才能从这些乱码把邮件的正文转化为正确的中文？
	对PERJVj7Jz8rH1tC5+s2sPC9ESVY+做Base64解码，得到byte[] 然后用Encoding.GetEncode(“gb18030”).GetString(字节数组)得到字符串 <DIV>上是中国同</DIV>
	This is a multi-part message in MIME format. 邮件有多个部分正文，MIME格式第一个部分 ——=_NextPart_53EB1CB0_0911E318_0BCA4BD4 Content-Type: text/plain; charset=”gb18030″ Content-Transfer-Encoding: base64 yc/Kx9bQufrNrA== 内容为text的，字符集gb18030，编码格式base64 第二个部分 ——=_NextPart_53EB1CB0_0911E318_0BCA4BD4 Content-Type: text/html; charset=”gb18030″ Content-Transfer-Encoding: base64 PERJVj7Jz8rH1tC5+s2sPC9ESVY+ 内容为html的，字符集gb18030，编码格式base64
	非常感谢请教下版主大人，对PERJVj7Jz8rH1tC5+s2sPC9ESVY+做Base64解码，得到byte[] 能不能指点一下怎么写Base64的解码得到byte[] 我在网上搜了好多都不行。
20分	这个.NET类库就支持Base64编码和解码，为什么要搜？ using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { byte[] b = Convert.FromBase64String("PERJVj7Jz8rH1tC5+s2sPC9ESVY+"); string html = Encoding.GetEncoding("gb18030").GetString(b); Console.WriteLine(html); } } } <DIV>上是中国同</DIV> 请按任意键继续. . .
	解决了，非常感谢
	再请教版主大人一个问题，解码邮件主题时 Subject: =?gb18030?B?0ru12NTa0qq5pA==?= 用以下代码 Encoding myEncoding = Encoding.GetEncoding(“gb18030”); myByte = myEncoding.GetBytes(“0ru12NTa0qq5pA=”); button1.Text = myEncoding.GetString(myByte); 得到的结果还是：0ru12NTa0qq5pA= 请版主大人指教这种情况应该怎么解码？
	引用 6 楼 chenshalin 的回复: 再请教版主大人一个问题，解码邮件主题时 Subject: =?gb18030?B?0ru12NTa0qq5pA==?= 用以下代码 Encoding myEncoding = Encoding.GetEncoding(“gb18030”); myByte = myEncoding.GetBytes(“0ru12NTa0qq5pA=”); button1.Text = myEncoding.GetString(myByte); 得到的结果还是：0ru12NTa0qq5pA= 请版主大人指教这种情况应该怎么解码？ Subject格式是这样的 =?charset?encoding?encoded-text?= 你要先把encoded-text部分Decode, encoding方式B代表Base64， Q代表quoted-printable. 然后在按照charset取得字符
20分	你的代码可以修改成 byte[] b = Convert.FromBase64String(“0ru12NTa0qq5pA==”); string html = Encoding.GetEncoding(“gb18030”).GetString(b);
	果然是这样的，谢谢findcaiyzh，谢谢版主
	怎么解析邮件中的附件呢？

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