Convert a MIME Entity to multipart/mixed

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Demonstrates the Chilkat Mime.ConvertToMultipartMixed method, which wraps the current entity in a new outer multipart/mixed, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you turn an existing single-part message into one that can hold attachments — rather than rebuilding it, you wrap it, and its content becomes the first child of a new multipart/mixed. Message-level and custom headers are carried onto the new outer entity so the message identity is preserved. Afterward, AppendPartFromFile adds attachments beside the original body.

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bool success = false;

Chilkat.Mime mime = new Chilkat.Mime();
success = mime.LoadMimeFile("qa_data/message.eml");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

//  Wrap the current entity in a new outer multipart/mixed entity.  The original entity becomes the
//  first child, which is what you do to add attachments to an existing single-part message.
success = mime.ConvertToMultipartMixed();
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

//  Now attachments can be appended alongside the original content.
success = mime.AppendPartFromFile("qa_data/report.pdf");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

Debug.WriteLine("Number of parts: " + Convert.ToString(mime.NumParts));