pop读取邮件头乱码

有的邮件内容是base64编码的。 需要手动解码。 

 

string patten = @"\=\?(?<Encoding>.*?)\?(?<Base>\D+?)\?(?<Content>.*?)\?\=";
                        var m = Regex.Match(line, patten);
                        if (m.Success)
                        {
                            string codeName = m.Groups["Encoding"].Value;
                            string baseCode = m.Groups["Base"].Value;
                            string content = m.Groups["Content"].Value;
                            if (baseCode.ToUpperInvariant() == "B")
                            {
                                //support base64 only, other do nothing
                                string tmp = Encoding.GetEncoding(codeName).GetString(Convert.FromBase64String(content));
                                line = Regex.Replace(line, patten, tmp);
                            }
                        }