CDATA format string convert with MimeKit

Question

I have string data as CDATA Format. How can I convert this to Html or normal view text at C#? Should I use mimeKit or something else?

 Received: from 172.19.76.148 (proxying for 85.105.234.193) (InterKepWebMail authenticated user parkentegrasyon) by kep.local with HTTP; Mon, 29 Jan 2018 18:51:40 +0300 Content-Type: multipart/mixed; boundary="------_=_NextPart_001_01F869E9.0A514C28" Message-ID: <8ec68378-eca0-428d-a350-94427435a521.webmail@testkep.inter-kep.com.tr> MIME-Version: 1.0 Date: Mon, 29 Jan 2018 18:51:40 +0300 From: "parkentegrasyon" <parkentegrasyon@testkep.inter-kep.com.tr> To: <parkentegrasyon@testkep.inter-kep.com.tr> Cc: <parkentegrasyon@testkep.inter-kep.com.tr> Subject: =?utf-8?Q?=C3=96rnek_KEP_2018-01-29_18=3A51=3A41?= User-Agent: InterKepWebMail/1.0.0 X-TR-REM-iletiTip: standart X-TR-REM-iletiID: --------_=_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

It's base64 encoded text. You can decode it like this

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

That prints 'Test ek'.

Answer 2

If you use MimeKit to parse the message, it will automatically decode the content (whether it be in base64 or quoted-printable).

In your example message, the text/html message body can be gotten like this:

var html = message.HtmlBody;

To get the decoded attachment content, you can do this:

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);
    }
}