如何在 `MailMessage` 中包含 `HTML` 标签

Question

在我的 Asp.Net 应用程序中，我试图用 html 标签格式化我的外发邮件消息，以便收件人在他们的电子邮件收件箱中打开它时看起来是正确的。以这个 post 为例，我有运行错误。首先，我有一个通用 'Utilities' 文件，其中我的 sendMail 函数配置有

Utilities.cs

 public static class Utility
{
   public static void sendEmail(string toaddress, string bodycontent, string subjectTxt, string ccAddress)
  {
      string sendEmail = string.Empty;
      try
      {
        System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage();
        mailMessage.IsBodyHtml = true;
        System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient();
       ....
       }
    }
 }

因此，我的 mailMessage.IsBodyHtml 被设置为 true。回到我的 SendEmail.cs 文件，这会被调用，当 SubmitBtn 被点击时，相应的 toaddress、bodycontent 等被插入。 bodycontent 填充了一个基于单选按钮选择的自动生成的字符串，然后插入 textarea。从 textarea 分配 bodycontent。它工作正常，直到我在消息中添加 ` 标签。

SendEmail.cs

protected void ButtonSend_Click(object sender, System.EventArgs e)
{
    ....
  Utility.sendEmail(userEmail, SpellTextBoxNotify.Text, TextBoxSubject.Text, ccClean);
...
}
protected void uxRadioButtonList_SelectedIndexChanged(object sender, EventArgs e)
{
   DataTable emailInfo = _emailDtr.GetTicketInfoByTicketNumber(Session["TicketNumber"].ToString());
   string email = emailInfo.Rows[0]["RequestorEmail"].ToString();
   string name = emailInfo.Rows[0]["RequestorName"].ToString();
   string phone = emailInfo.Rows[0]["RequestorPhone"].ToString();
             .....
   if (uxRadioButtonList.SelectedItem.Text == "Forward")
   {
     TextBoxTo.Text = userEmail;
     TextBoxSubject.Text = "BCA Helpline Request Detailed Response : " + s;
     string new_message = "Please email:steve.mcmaster@ideationinc.com**" +
       "Dear Steve,*<br />" +
       "This BC Helpline inquiry has been flagged as a Tier 4 request.**<br /><br />" +
       "Please see the inquiry below. This ticket will be closed out in our system. Please let us know if you’d like  * <br />" +
       "us to respond.   **<br />" +
       "Contact info: *<br />" +
        name + "*<br />" +
        "P: " + phone + "*<br />" +
        email + "**<br /><br />" +
        "Regards, **<br /><br />" + name + "(CTR) *" + "Dewberry Consultants LLC, Contractor<br />*Federal Emergency Management Agency*<br />FEMA HQ*<br />500 C. St., SW*Washington, D.C. 20472<br />*Email: " + userEmail;
        new_message = new_message.Replace("*", "" + System.Environment.NewLine);
        SpellTextBoxNotify.Text = new_message;
      }

      else if (uxRadioButtonList.SelectedItem.Text == "Interim Response")
      {
       ...
      }
        ....
    }
 }

在我添加 <br /> 标签之前一切正常。然后，按钮 onClick 功能永远不会触发，我在浏览器控制台中收到以下消息：“

Sys.WebForms.PageRequestManagerServerErrorException: A potentially dangerous Request.Form value was detected from the client (ctl00$ContentPlaceHolder1$SpellTextBoxNotify="...tesinc.com
Any suggestions on how to overcome this issue and get the html tags to work? ".

Answer 1

您的问题是您通过网页上控件的 Text 属性传递 HTML 字符串。 Web 服务器正在拒绝看起来像是将 HTML 注入您的页面的尝试。

一种解决方案是将 TextBoxSubject.Text 保留为纯文本，并在 ButtonSend_Click

中将换行符转换为 HTML

protected void ButtonSend_Click(object sender, System.EventArgs e)
{
....
  Utility.sendEmail(userEmail, SpellTextBoxNotify.Text, newlineToBR(TextBoxSubject.Text), ccClean);
...
}

Answer 2

您设置它的方式看起来像是用户在网络表单中输入代码，这是不行的。

所以将所有代码从 protected void uxRadioButtonList_SelectedIndexChanged(object sender, EventArgs e) 移动到 protected void ButtonSend_Click(object sender, System.EventArgs e) 并且不要设置文本框的文本到电子邮件正文。

日

如何在 `MailMessage` 中包含 `HTML` 标签

How to include `HTML` tags in `MailMessage`

html

c#

asp.net

system.net.mail

mailmessage