要發送HTML格式郵件，需要設置MailMessage對象的IsBodyHtml屬性，設置為true。
類MailMessage在命名空間System.Net.Mail下。
using System.Net.Mail;
發送HTML格式的郵件在HoverTreeTop項目中已經實現，并發送成功。
需依賴于HoverTreeFrame項目的HoverTreeEmail類。
方法為：
頁面截圖：
EmailSend.aspx頁面：
<h2>發送郵件</h2> <br />收信人郵箱：<asp:TextBox runat="server" ID="textBox_mail" TextMode="Email" Columns="53" /> <br />標題：<asp:TextBox runat="server" ID="textBox_title" Columns="60" /> <br /><asp:CheckBox runat="server" ID="checkBox_isHtml" Text="是否HTML格式" /> <br />內容： <br /><asp:TextBox runat="server" ID="textBox_content" TextMode="MultiLine" Rows="10" Columns="70" /> <br /> <asp:Button runat="server" ID="button_send" Text="發送郵件" OnClick="button_send_Click" /> <br /> <asp:Literal runat="server" ID="literal_tips" />
EmailSend.aspx.cs代碼：
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來發送郵件 //literal_tips.Text = HoverTreeEmail.HoverTreeSendEmail("smtp.hovertree.com", "hello@.mail.hovertree.com", "hewenqi", "hello@mail.hovertree.com", "ht@mail.hovertree.com", "祝你生日快樂！", "生日快樂！天天開心！ -- 何問起"); // 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 = "發送成功！"; textBox_content.Text = ""; textBox_title.Text = ""; textBox_mail.Text = ""; } } }}用于發送的示例內容：
<html><body> <h2>C#發送html格式的郵件 </h2> <div style="background-color:green;width:200px;height:100px;color:white">HoverTreeTop</div></body></html>
代碼下載：http://xiazai.VeVB.COm/201702/yuanma/hovertreetop_jb51.rar
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