要发送HTML格式邮件，需要设置MailMessage对象的IsBodyHtml属性，设置为true。
类MailMessage在命名空间System.Net.Mail下。
using System.Net.Mail;
发送HTML格式的邮件在HoverTreeTop项目中已经实现，并发送成功。
需依赖于HoverTreeFrame项目的HoverTreeEmail类。
方法为：
页面截图：
EmailSend.aspx页面：
<h2>发送邮件</h2> <br />收信人邮箱：<asp:TextBox runat="server" ID="textBox_mail" TextMode="Email" Columns="53" /> <br />标题：<asp:TextBox runat="server" ID="textBox_title" Columns="60" /> <br /><asp:CheckBox runat="server" ID="checkBox_isHtml" Text="是否HTML格式" /> <br />内容： <br /><asp:TextBox runat="server" ID="textBox_content" TextMode="MultiLine" Rows="10" Columns="70" /> <br /> <asp:Button runat="server" ID="button_send" Text="发送邮件" OnClick="button_send_Click" /> <br /> <asp:Literal runat="server" ID="literal_tips" />
EmailSend.aspx.cs代码：
using System;using System.Net.Mail;using HoverTree.HoverTreeFrame.HtNet;using HoverTreeTop.HtConfig.MyConfig;namespace HoverTreeTop.HoverTree.HoverTreePanel.HTPanel.HEmail{ public partial class EmailSend : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void button_send_Click(object sender, EventArgs e) { //使用smtp来发送邮件 //literal_tips.Text = HoverTreeEmail.HoverTreeSendEmail("smtp.hovertree.com", "hello@.mail.hovertree.com", "hewenqi", "hello@mail.hovertree.com", "ht@mail.hovertree.com", "祝你生日快乐！", "生日快乐！天天开心！ -- 何问起"); // literal_tips.Text = HoverTreeEmail.HoverTreeSendEmail(HtSmtpConfig.HtSmtpHost, HtSmtpConfig.HtSmtpUserName, HtSmtpConfig.HtSmtpPassword, HtSmtpConfig.HtSmtpFromEmail, textBox_mail.Text.Trim(), textBox_title.Text, textBox_content.Text); SmtpClient h_smtpClient = new SmtpClient(); h_smtpClient.Host = HtSmtpConfig.HtSmtpHost; MailMessage h_mailMessage = new MailMessage(); h_mailMessage.From = new MailAddress(HtSmtpConfig.HtSmtpFromEmail); h_mailMessage.To.Add(textBox_mail.Text.Trim()); h_mailMessage.Subject = textBox_title.Text.Trim(); h_mailMessage.Body = textBox_content.Text; h_mailMessage.IsBodyHtml = checkBox_isHtml.Checked; literal_tips.Text = HoverTreeEmail.HoverTreeSendEmail(HtSmtpConfig.HtSmtpUserName, HtSmtpConfig.HtSmtpPassword, h_smtpClient, h_mailMessage); if (literal_tips.Text == "") { literal_tips.Text = "发送成功！"; textBox_content.Text = ""; textBox_title.Text = ""; textBox_mail.Text = ""; } } }}用于发送的示例内容：
<html><body> <h2>C#发送html格式的邮件 </h2> <div style="background-color:green;width:200px;height:100px;color:white">HoverTreeTop</div></body></html>
代码下载：http://xiazai.VeVB.COm/201702/yuanma/hovertreetop_jb51.rar
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