c# - HTML 表格在邮件中不起作用

Question

我正在创建一个运行时 HTML 表并通过邮件发送。表格被添加到邮件正文中。但是当邮件被触发时，它显示的是 System.Web.UI.HtmlControls.HtmlTable 而不是表格的内容。

//.csPage:

HtmlTable tbl = new HtmlTable();
        tbl.Border = 1;
        tbl.CellSpacing = 0;
        HtmlTableRow trHeader = new HtmlTableRow();
        HtmlTableCell tcHeader = new HtmlTableCell();
        tcHeader.InnerText = "Mobile Number";
        HtmlTableCell tc1Header = new HtmlTableCell();
        tc1Header.InnerText = "Carrier";
        trHeader.Cells.Add(tcHeader);
        trHeader.Cells.Add(tc1Header);
        tbl.Rows.Add(trHeader);
 for (int i = 0; i < dvNumbers.Rows.Count; i++)
            {
                HtmlTableRow tr = new HtmlTableRow();
                HtmlTableCell tc = new HtmlTableCell();
                tc.InnerText = dvNumbers.Rows[i].Cells[0].Text;
                tr.Cells.Add(tc);
                HtmlTableCell tc1 = new HtmlTableCell();
                tc1.InnerText = dvNumbers.Rows[i].Cells[1].Text;
                tr.Cells.Add(tc1);
                tbl.Rows.Add(tr);

            }

            objMail.MobileDeactivationMail(txtMailTo.Text, txtMailCC.Text, txtMailBCC.Text, tbl);

//邮件代码:

public bool MobileDeactivationMail(string strReceiverMailId, string CC, string BCC, HtmlTable tbl)
    {
        bool blnIsMailSent = false;
        MailMessage objMailMsg;
        try
        {
            objMailMsg = new MailMessage();
            MailAddress FromAdd = new MailAddress("x@x.com");
            objMailMsg.From = FromAdd;
            objMailMsg.To.Add(new MailAddress(strReceiverMailId));
            if (CC != "")
                objMailMsg.CC.Add(new MailAddress(CC));
            if (BCC != "")
                objMailMsg.Bcc.Add(new MailAddress(BCC));
            objMailMsg.Subject = "Deactivation of Mobile Numbers";
            objMailMsg.Priority = MailPriority.High;
            objMailMsg.IsBodyHtml = true;
            objMailMsg.Body = "<table style='font-family:Tahoma; font-size:small';><tr><td> Dear Sir/Mam</td<</tr>," + "<tr><td></td></tr><tr><td></td><td><td><td>         Kindly Deactivate the following mobile numbers.</br></br>" + tbl + " </td></td></td></tr></table><table style='font-family:Tahoma; font-size:small';><tr><td>Regards,</td></tr><tr><td>HR</td></tr></table>";
            SmtpClient SmtpMail = new SmtpClient();
            SmtpMail.Port = 25;
            SmtpMail.Host = "xxxxx";
            System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential("xxxxxxx", "xxxxx");
            SmtpMail.UseDefaultCredentials = false;
            SmtpMail.Credentials = SMTPUserInfo;
            SmtpMail.Send(objMailMsg);
            objMailMsg.Dispose();
            blnIsMailSent = true;
        }
        catch (Exception Ex)
        {
            blnIsMailSent = false;
        }

        return blnIsMailSent;
    }

我哪里错了？

Answer 1

你的问题出在这一行:

objMailMsg.Body = "<table style='font-family:Tahoma; font-size:small';>
   <tr><td> Dear Sir/Mam</td<</tr>," + "<tr><td></td></tr>
   <tr><td></td><td><td><td>Kindly Deactivate the following mobile numbers.</br></br>" + tbl + " </td></td></td></tr></table>
   <table style='font-family:Tahoma; font-size:small';><tr><td>Regards,</td></tr><tr><td>HR</td>  </tr></table>";

具体来说:

" + tbl + "

当您将对象连接到字符串中时，它将调用 tbl.ToString()

默认情况下，这将返回类名 - 而不是您想要的表格的 HTML。

使用 HTML 表格解决这个问题的方法是直接写出 HTML。不幸的是，尽管存在 InnerText 和 InnerHTML，但此控件 (MSDN HTMLTable Properties) 不支持该控件，因此您必须使用 RenderControl (MSDN RenderControl documentation) 方法:

        StringWriter writer = new StringWriter(); 
        Html32TextWriter htmlWriter = new Html32TextWriter(writer); 
        tbl.RenderControl(htmlWriter); 
        string html = writer.ToString(); 

然后您可以连接此 HTML 字符串而不是 tbl。