Attach a File to a Multipart MIME Entity

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Demonstrates the Chilkat Mime.AppendPartFromFile method, which reads a local file, creates an attachment part, and appends it. The only argument is the file path; the content headers are chosen from the filename extension.

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 the one-call way to add an attachment: Chilkat reads the file, infers its Content-Type from the extension, base64-encodes binary content, and appends it as a child part — typically inside a multipart/mixed. It is the building block behind adding attachments to an email, saving you from constructing the part and setting its headers by hand.

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bool success = false;

//  Demonstrates the Mime.AppendPartFromFile method, which reads a local file, creates an attachment
//  part, and appends it.  The only argument is the file path; the content headers are chosen from
//  the filename extension.

Chilkat.Mime mime = new Chilkat.Mime();
success = mime.NewMultipartMixed();
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

//  A message body part.
Chilkat.Mime bodyPart = new Chilkat.Mime();
success = bodyPart.SetBodyFromPlainText("Please see the attached files.");
if (success == false) {
    Debug.WriteLine(bodyPart.LastErrorText);
    return;
}

success = mime.AppendPart(bodyPart);
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

//  Attach files directly.
success = mime.AppendPartFromFile("qa_data/report.pdf");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

success = mime.AppendPartFromFile("qa_data/photo.jpg");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

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