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A C# Implementation of Mime De/encode

, 21 Aug 2005 CPOL
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A C# implementation of Mime de/encode


Several days ago, when I needed a MIME lib to encode/decode some MIME type messages in C#, I did not find any suitable classes. What I only found is a C++ implementation written by nickadams. I read his code and then, I translated it into C# code. And it works well for me.

How To Use

It is as easy to use as nickadams' code.Smile | :) Here's the example:

Encode a Message

   MimeMessage mail = new MimeMessage();
      Nick Name <>, 
      \"Nick Name\" <>");
   mail.SetSubject("test mail",null);
   mail.SetFieldValue("X-Priority", "3 (Normal)", null);

   // Initialize header
   // generate a boundary string automatically
   // if the parameter is NULL
   // Add a text body part
   // default Content-Type is "text/plain"
   // default Content-Transfer-Encoding is "7bit"
   MimeBody mBody = mail.CreatePart();
   mBody.SetText("Hi, there");  // set the content of the body part

   // Add a file attachment body part
   mBody = mail.CreatePart();
   mBody.SetDescription("enclosed photo",null);
   // if Content-Type is not specified, it'll be
   // set to "image/jpeg" by ReadFromFile()

   // Generate a simple message
   MimeMessage mail2 = new MimeMessage();
   mail2.SetSubject("This is an attached message",null);
   mail2.SetText("Content of attached message.\r\n");

   // Attach the message
   mBody = mail.CreatePart();
   mBody.SetDescription("enclosed message",null);
   // if Content-Type is not specified, it'll be
   // set to "message/rfc822" by SetMessage()

   // Add an embedded multipart
   mBody = mail.CreatePart();
   MimeBody mBodyChild = mBody.CreatePart();
   mBodyChild.SetText("Content of Part 1\r\n");
   mBodyChild = mBody.CreatePart();
   mBodyChild.SetText("Content of Part 2\r\n");

   //store content to a string buffer
   StringBuilder sb = new StringBuilder();

Decode a Message

   StreamReader sr = new StreamReader(".\\aaa.txt");
   string message = sr.ReadToEnd();
   MimeMessage aMimeMessage = new MimeMessage();
   ArrayList bodylist = new ArrayList();
   for(int i=0;i<bodylist.Count;i++)
    MimeBody ab = (MimeBody) bodylist[i];
     string m = ab.GetText();
    else if(ab.IsAttachment())


Many thanks to nickadams. Your great work helps me a lot.


  • 21st August, 2005: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Web Developer
China China
I think I have to start coding my life now...Smile | :)

Comments and Discussions

GeneralHpw to download attatchment that are inside MIME file Pinmemberrishi2123-Feb-11 18:48 
GeneralError decoding image attachments please help PinmemberWajeeh7-Dec-09 21:40 

i am testing your code sample for reading MM7 message (Soap Format). Getting SMIL and TEXT attachments out of the message is working fine but when it comes to images it is saving the image with the name present iin the header but the image file cannot be opened to view what it was. windows says that the file is either corrupted or too large. please help.

Wajeeh Ullah
GeneralUnsafe code PinmemberGWBas1c6-Aug-09 10:38 
GeneralGreat! Thanks. Pinmemberbhiller24-Jul-09 4:29 
Generalgod bless you Pinmemberbookerman12-Jan-09 6:10 
GeneralLicense PinmemberMember 384073731-Aug-08 5:18 
GeneralBug: empty lines in mime header and mime body without children PinmemberdB.26-Jun-08 7:17 
GeneralBug: inifinite loop in processing PinmemberdB.26-Jun-08 5:15 
GeneralMIME digital signature Pinmemberkerberos_prozac5-Jul-06 7:53 
GeneralRe: MIME digital signature Pinmemberkerberos_prozac5-Jul-06 8:11 
QuestionHow can we use this to send emails? PinmemberBohemianDre26-Jun-06 17:51 
Generaldecode from binary Pinmemberjsli@ukr.net5-Jan-06 22:48 
GeneralA Couple Bugs Pinmembermsailing27-Oct-05 8:52 
QuestionCan someone confirm that this works outside of encoding and decoding using the same classes? PinsussAnonymous22-Sep-05 15:59 
AnswerRe: Can someone confirm that this works outside of encoding and decoding using the same classes? PinsussAnonymous23-Sep-05 11:12 
AnswerWHOOPS! Looks like I was wrong. PinsussAnonymous23-Sep-05 11:23 
GeneralMEDIA VEDIO --&gt; MEDIA VIDEO Pinmemberfeuerfrei22-Aug-05 1:05 
GeneralRe: MEDIA VEDIO --&gt; MEDIA VIDEO Pinmemberlionwind22-Aug-05 2:58 
GeneralC# conversion Pinmemberszgt21-Aug-05 23:28 
GeneralRe: C# conversion Pinmemberlionwind22-Aug-05 2:53 

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