A C# Implementation of Mime De/encode

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Introduction

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.:) Here's the example:

Encode a Message

   MimeMessage mail = new MimeMessage();
   mail.SetDate();
   mail.Setversion();
   mail.SetFrom("sender@local.com",null);
   mail.SetTo("recipient1@server1.com, 
      Nick Name <recipient2@server1.com>, 
      \"Nick Name\" <recipient3@server2.com>");
   mail.SetCC("recipient4@server4.com",null);
   mail.SetSubject("test mail",null);
   mail.SetFieldValue("X-Priority", "3 (Normal)", null);

   // Initialize header
   mail.SetContentType("multipart/mixed");
   // generate a boundary string automatically
   // if the parameter is NULL
   mail.SetBoundary(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);
   mBody.SetTransferEncoding("base64");
   // if Content-Type is not specified, it'll be
   // set to "image/jpeg" by ReadFromFile()
   mBody.ReadFromFile(".\\00.jpg"); 

   // Generate a simple message
   MimeMessage mail2 = new MimeMessage();
   mail2.SetFrom("abc@abc.com",null);
   mail2.SetTo("abc@abc.com",null);
   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);
   mBody.SetTransferEncoding("7bit");
   // if Content-Type is not specified, it'll be
   // set to "message/rfc822" by SetMessage()
   mBody.SetMessage(mail2); 

   // Add an embedded multipart
   mBody = mail.CreatePart();
   mBody.SetContentType("multipart/alternative");
   mBody.SetBoundary("embeded_multipart_boundary");
   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();
   mail.StoreBody(sb);

Decode a Message

   StreamReader sr = new StreamReader(".\\aaa.txt");
   string message = sr.ReadToEnd();
   MimeMessage aMimeMessage = new MimeMessage();
   aMimeMessage.LoadBody(message);
   ArrayList bodylist = new ArrayList();
   aMimeMessage.GetBodyPartList(bodylist);
   for(int i=0;i<bodylist.Count;i++)
   {
    MimeBody ab = (MimeBody) bodylist[i];
    if(ab.IsText())
    {
     string m = ab.GetText();
     System.Windows.Forms.MessageBox.Show(m);
    }
    else if(ab.IsAttachment())
    {
     ab.WriteToFile("new"+ab.GetName());
    }
   }