Check if a MIME Part is an Attachment

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Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). It takes no arguments.

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

Background: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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bool success = false;

//  Demonstrates the Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

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

int n = mime.NumParts;
Chilkat.Mime part = new Chilkat.Mime();
int i;
for (i = 0; i <= n - 1; i++) {
    success = mime.PartAt(i,part);
    if (success == false) {
        Debug.WriteLine(mime.LastErrorText);
        return;
    }

    if (part.IsAttachment()) {
        Debug.WriteLine("Part " + Convert.ToString(i) + " (" + part.ContentType + ") is an attachment.");
    }

}