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通过C#发送自定义的html格式邮件

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：
public static string HoverTreeSendEmail(string userName, string password, SmtpClient smtpClient, MailMessage mailMessage)
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 by 何问起</h2>
    <a href="http://hovertree.com/h/bjag/swth6nfh.htm">http://hovertree.com/h/bjag/swth6nfh.htm </a>
    <div style="background-color:green;200px;height:100px;color:white">何问起 HoverTreeTop</div>
</body>
</html>

参考：http://hovertree.com/h/bjag/swth6nfh.htm

代码下载：http://hovertree.com/h/bjaf/hv6cqe5n.htm

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原文地址：https://www.cnblogs.com/sosoft/p/csharpemail.html