/// <summary>
/// Glue method to create a bodypart from a MIMEPart instance.
/// </summary>
/// <param name="mimePart">The MIMEPart instance to create the
/// bodypart instance from.</param>
/// <returns>An initialized instance of the Bodypart class.</returns>
private static Bodypart BodypartFromMIME(MIMEPart mimePart) {
NameValueCollection contentType = ParseMIMEField(
mimePart.header["Content-Type"]);
Bodypart p = new Bodypart(null);
Match m = Regex.Match(contentType["value"], "(.+)/(.+)");
if (m.Success) {
p.Type = ContentTypeMap.fromString(m.Groups[1].Value);
p.Subtype = m.Groups[2].Value;
}
p.Encoding = ContentTransferEncodingMap.fromString(
mimePart.header["Content-Transfer-Encoding"]);
p.Id = mimePart.header["Content-Id"];
foreach (string k in contentType.AllKeys)
p.Parameters.Add(k, contentType[k]);
p.Size = mimePart.body.Length;
if (mimePart.header["Content-Disposition"] != null) {
NameValueCollection disposition = ParseMIMEField(
mimePart.header["Content-Disposition"]);
p.Disposition.Type = ContentDispositionTypeMap.fromString(
disposition["value"]);
p.Disposition.Filename = disposition["Filename"];
foreach (string k in disposition.AllKeys)
p.Disposition.Attributes.Add(k, disposition[k]);
}
return p;
}
/// <summary>
/// Parses the body of a multipart MIME mail message.
/// </summary>
/// <param name="reader">An instance of the StringReader class initialized
/// with a string containing the body of the mail message.</param>
/// <param name="boundary">The boundary value as is present as part of
/// the Content-Type header field in multipart mail messages.</param>
/// <returns>An array of initialized MIMEPart instances representing
/// the various parts of the MIME mail message.</returns>
private static MIMEPart[] ParseMIMEParts(StringReader reader, string boundary) {
List<MIMEPart> list = new List<MIMEPart>();
string start = "--" + boundary, end = "--" + boundary + "--", line;
// Skip everything up to the first boundary
while ((line = reader.ReadLine()) != null) {
if (line.StartsWith(start))
break;
}
// Read MIME parts delimited by boundary strings
while (line != null && line.StartsWith(start)) {
MIMEPart p = new MIMEPart();
// Read the part header
StringBuilder header = new StringBuilder();
while (!String.IsNullOrEmpty(line = reader.ReadLine()))
header.AppendLine(line);
p.header = ParseMailHeader(header.ToString());
// Account for nested multipart content
NameValueCollection contentType = ParseMIMEField(p.header["Content-Type"]);
if (contentType["Boundary"] != null)
list.AddRange(ParseMIMEParts(reader, contentType["boundary"]));
// Read the part body
StringBuilder body = new StringBuilder();
while ((line = reader.ReadLine()) != null) {
if (line.StartsWith(start))
break;
body.AppendLine(line);
}
p.body = body.ToString();
// Add the MIME part to the list unless body is null which means the
// body contained nested multipart content
if (!String.IsNullOrEmpty(p.body))
list.Add(p);
// If the boundary is actually the end boundary, we're done
if (line == null || line.StartsWith(end))
break;
}
return list.ToArray();
}