/// <summary>
/// 生成一个不重复分隔
/// </summary>
/// <returns>返回字符串表达形式</returns>
internal static string MakeBoundary()
{
string Rueslt = "Boundary-=_Next.";
//加入不重复时间
Random rd = new Random();
Rueslt += Coding.Base64Encode(DateTime.Now.ToString("yMMddHHmmssffff") + rd.Next(1, 30).ToString(), Encoding.ASCII);
return(Rueslt);
}
/// <summary>
/// 生成一个邮件ID
/// </summary>
/// <returns>返回邮件ID的字符串表达形式</returns>
internal static string MakeMessageID()
{
Random rd = new Random();
string Rueslt = "Message-ID: <";
Rueslt += Coding.Base64Encode(DateTime.Now.ToString("yMMddHHmmssffffff") + rd.Next(1, 30).ToString(), Encoding.ASCII); //加入邮件ID的时间表达型式，以此表示ID不重复
Rueslt += string.Format("@{0}>", System.Net.Dns.GetHostName());
return(Rueslt);
}
/// <summary>
/// 进行Html文本内容的读取
/// </summary>
/// <returns>返回所生成的Html文本内容数据</returns>
internal protected virtual string ReadHtml()
{
if (string.IsNullOrEmpty(this.Html))
{
return("");
}
StringBuilder sb = new StringBuilder();
//
sb.Append("--");
sb.Append(this.Boundary);
sb.Append(MailCommon.NewLine); //分隔完成
sb.Append("Content-Type: text/html;");
sb.Append(MailCommon.NewLine);
sb.AppendFormat(" charset=\"{0}\" ", this.SetCharset);
sb.Append(MailCommon.NewLine);
sb.AppendFormat("Content-Transfer-Encoding: ");
if (this.EncodeType == MailEncodeType.BASE64)
{
sb.Append("base64");
sb.Append(MailCommon.NewLine + MailCommon.NewLine);
sb.Append(Coding.Base64Encode(this.Html, this.Charset));
sb.Append(MailCommon.NewLine + MailCommon.NewLine);
return(sb.ToString());
}
//qp -- quoted-printable"
sb.Append("quoted-printable");
sb.Append(MailCommon.NewLine + MailCommon.NewLine);
sb.Append(Coding.EncodeQuotedPrintable(this.Html, this.Charset));
sb.Append(MailCommon.NewLine + MailCommon.NewLine);
return(sb.ToString());
}
/// <summary>
/// 进行BASE64头的编码
/// </summary>
/// <param name="Src">要进行编码的串</param>
/// <param name="enc">编码类型</param>
/// <param name="Charset">文件字符集</param>
/// <returns>返回编码后的串</returns>
internal static string EncodBase64Head(string Src, Encoding enc, string Charset)
{
return("=?" + Charset + "?B?" + Coding.Base64Encode(Src, enc) + "?=");
}