使用MimeKit转换CDATA格式字符串

Question

我将字符串数据作为CDATA格式。如何在C＃将其转换为Html或普通视图文本？我应该使用mimeKit还是别的什么？

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  Mon, 29 Jan 2018 18:51:40 +0300
Content-Type: multipart/mixed;
  boundary="------_=_NextPart_001_01F869E9.0A514C28"
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Date: Mon, 29 Jan 2018 18:51:40 +0300
From: "parkentegrasyon" <parkentegrasyon@testkep.inter-kep.com.tr>
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Cc: <parkentegrasyon@testkep.inter-kep.com.tr>
Subject: =?utf-8?Q?=C3=96rnek_KEP_2018-01-29_18=3A51=3A41?=
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--------_=_NextPart_001_01F869E9.0A514C28
Content-Type: text/html;
  charset="utf-8"
Content-Transfer-Encoding: quoted-printable

<b>Merhaba D=C3=BCnya!</b>
--------_=_NextPart_001_01F869E9.0A514C28
Content-Type: application/octet-stream;
  name="test.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
  filename="test.txt"

dGVzdCBlaw==

--------_=_NextPart_001_01F869E9.0A514C28--

Answer 1

它是base64编码的文本。你可以像这样解码它

      byte[] data = Convert.FromBase64String("dGVzdCBlaw==");
      string decodedString = Encoding.UTF8.GetString(data);
      Console.WriteLine(decodedString);

打印＆＃39;测试ek＆＃39;。

Answer 2

如果您使用MimeKit解析邮件，它将自动解码内容（无论是在base64还是quoted-printable）。

在您的示例邮件中，text/html邮件正文可以像这样：

var html = message.HtmlBody;

要获取已解码的附件内容，您可以执行以下操作：

foreach (var attachment in message.Attachments.OfType<MimePart> ()) {
    using (var memory = new MemoryStream ()) {
        attachment.Content.DecodeTo (memory);

        var data = memory.ToArray ();
        var text = Encoding.UTF8.GetString (data);
    }
}