AkaneMail.MailEditorForm.GetMailSize C# (CSharp) Method

        public string GetMailSize()
        {
            string addr = AccountInfo.FromAddress;
            string priority = mailPriority[comboPriority.Text];

            double attachSize = 0;
            // 添付ファイルがあるとき
            if (attachName != "") {
                attachSize = attachName.Split(',').Sum(f => new FileInfo(f).Length * 1.33);
            }

            // メールサイズの合計を取得する
            var formtexts = new[] { textAddress, textSubject, textBody, textCc, textBcc }
                .Select(t => t.Text).ToArray();
            var moretext = new[] { addr, priority };
            int sizes = formtexts.Concat(moretext)
                .Sum(b => System.Text.Encoding.UTF8.GetBytes(b).Length);

            return (sizes + (long)attachSize).ToString();
        }