C#发送邮件并将图片插入邮件内容

邮件内容的字符串

StringBuilder Mbody = new StringBuilder();            Mbody.AppendLine("尊敬的领导：");            Mbody.AppendLine("</br>");            Mbody.AppendLine("<p>    您好！</p>");            Mbody.AppendLine("<p>" + mail.MailBoby + "</p>");            int id = 0;            foreach (Models.ChartInfoModel item in mail.ChartList)            {                Mbody.AppendLine("" + "<a href=" + "'http://10.18.100.77'><img alt='图片' src=cid:" + id + "></a>");                Mbody.AppendLine(" <hr />");                id++;            }
///////////////////////////////////
    int j = 0;            foreach (Models.ChartInfoModel item in mail.ChartList)            {
                string filePath = Path.Combine(item.ChartPath, item.ChartTitle + ".png");                message.Attachments.Add(new Attachment(filePath));                //设置附件类型                message.Attachments[j].ContentType.Name = "p_w_picpath/png";                //设置附件 Id                message.Attachments[j].ContentId = j.ToString();                //设置附件为 inline-内联                message.Attachments[j].ContentDisposition.Inline = true;                //设置附件的编码格式                message.Attachments[j].TransferEncoding = System.Net.Mime.TransferEncoding.Base64;                j++;            }