Check if a MIME Part is HTML

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Demonstrates the Chilkat Mime.IsHtml method, which returns whether the Content-Type is exactly text/html. It takes no arguments and applies to the current part.

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: Finding the HTML part is the common goal when rendering a message richly — it is the formatted version a mail client prefers. In a multipart/alternative you would locate it with this predicate and fall back to the plain-text part when it is absent.

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bool success = false;

//  Demonstrates the Mime.IsHtml method, which returns whether the Content-Type is text/html.  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.IsHtml()) {
        Debug.WriteLine("Part " + Convert.ToString(i) + " (" + part.ContentType + ") is HTML.");
    }

}