C#利用System.Net发送邮件（带 抄送、密送、附件、html格式的邮件）

　　net2.0后，C#可以利用System.Net发送邮件了。

　　代码整理如下：

/**************************************
 * <copyright file="SendEail.cs">
 * Copyright(c)2014 LeeStudio All rights reserved.
 * CLR版本：4.0.30319.17929
 * 开发团队：欺心伴月个人工作室
 * 技术博客：http://www.cnblogs.com/lichunyang/
 * 所属工程：LeeStudio.Basic
 * 创 建 者：Frank Lee
 * 修改时间：2014-02-20 11:20
 * </copyright>
**************************************/

using System;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;

namespace LeeStudio.Basic
{
    /// <summary>
    /// 邮件发送类
    /// </summary>
    public class SendEmail
    {
        private MailMessage mailMessage = new MailMessage(); //实例化一个邮件类

        #region 构造函数
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="toAddresses">收件人地址（多个以,号分开）</param>
        /// <param name="fromAddress">发件人地址</param>
        /// <param name="title">主题</param>
        /// <param name="body">正文</param>
        public SendEmail(string toAddresses, string fromAddress, string title, string body)
            : this(toAddresses, fromAddress, "", "", title, body, false)
        {
        }

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="toAddress">收件人地址</param>
        /// <param name="fromAddress">发件人地址</param>
        /// <param name="toName">收件人名字</param>
        /// <param name="fromName">发件人姓名</param>
        /// <param name="title">主题</param>
        /// <param name="body">正文</param>
        /// <param name="isBodyHtml">正文是否为html格式</param>
        public SendEmail(string toAddress, string fromAddress, string toName, string fromName, string title, string body, bool isBodyHtml)
        {
            mailMessage.From = new MailAddress(fromAddress, fromName, Encoding.GetEncoding(936));
            if (toName.Equals(""))
                mailMessage.To.Add(toAddress);
            else
                mailMessage.To.Add(new MailAddress(toAddress, toName, Encoding.GetEncoding(936)));

            mailMessage.Subject = title;
            mailMessage.SubjectEncoding = Encoding.GetEncoding(936);

            mailMessage.Body = body;
            mailMessage.IsBodyHtml = isBodyHtml;
            mailMessage.BodyEncoding = Encoding.GetEncoding(936);
        }
        #endregion

        /// <summary>
        /// 设置SMTP，并且将邮件发送出去
        /// 所有参数都设置完成后再调用该方法
        /// </summary>
        /// <param name="password">发件人密码</param>
        /// <param name="smtpHost">SMTP服务器地址</param>
        public void SetSmtp(string password, string smtpHost)
        {
            SetSmtp(mailMessage.From.Address, password, smtpHost, 25, false, MailPriority.Normal);
        }

        /// <summary>
        /// 设置SMTP，并且将邮件发送出去
        /// 所有参数都设置完成后再调用该方法
        /// </summary>
        /// <param name="address">发件人地址（必须为真实有效的email地址）</param>
        /// <param name="password">发件人密码</param>
        /// <param name="smtpHost">SMTP服务器地址</param>
        /// <param name="smtpPort">SMTP服务器的端口</param>
        /// <param name="isEnableSsl">SMTP服务器是否启用SSL加密</param>
        /// <param name="priority">邮件的优先级</param>
        public void SetSmtp(string address, string password, string smtpHost, int smtpPort, bool isEnableSsl, MailPriority priority)
        {
            SmtpClient smtp = new SmtpClient();
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Credentials = new NetworkCredential(address, password);
            smtp.Host = smtpHost;
            smtp.Port = smtpPort;
            smtp.EnableSsl = isEnableSsl;

            mailMessage.Priority = priority;
            smtp.Send(mailMessage); //发送邮件
        }

        #region //设置邮件地址
        /// <summary>
        /// 设置更多收件人
        /// </summary>
        /// <param name="toAddresses">收件人地址</param>
        public void SetMoreToAddress(string toAddresses)
        {
            mailMessage.To.Add(toAddresses);
        }

        /// <summary>
        /// 设置更多收件人
        /// </summary>
        /// <param name="toAddresses">收件人地址</param>
        /// <param name="toName">收件人名字</param>
        public void SetMoreToAddress(string toAddress, string toName)
        {
            mailMessage.To.Add(new MailAddress(toAddress, toName, Encoding.GetEncoding(936)));
        }

        /// <summary>
        /// 设置抄送者（多个以,号分开）
        /// </summary>
        /// <param name="ccAddresses">抄送者地址</param>
        public void SetCarbonCopyFor(string ccAddresses)
        {
            mailMessage.CC.Add(ccAddresses);
        }

        /// <summary>
        /// 设置抄送者
        /// </summary>
        /// <param name="ccAddress">抄送者地址</param>
        /// <param name="ccName">抄送者名字</param>
        public void SetCarbonCopyFor(string ccAddress, string ccName)
        {
            mailMessage.Bcc.Add(new MailAddress(ccAddress, ccName, Encoding.GetEncoding(936)));
        }

        /// <summary>
        /// 设置密送者（多个以,号分开）
        /// </summary>
        /// <param name="bccAddresses">密送者</param>
        public void SetBlindCarbonCopyFor(string bccAddresses)
        {
            mailMessage.Bcc.Add(bccAddresses);
        }

        /// <summary>
        /// 设置密送者
        /// </summary>
        /// <param name="bccAddress">密送者</param>
        /// <param name="bccName">密送者名字</param>
        public void SetBlindCarbonCopyFor(string bccAddress, string bccName)
        {
            mailMessage.Bcc.Add(new MailAddress(bccAddress, bccName, Encoding.GetEncoding(936)));
        }
        #endregion

        #region 添加附件
        /// <summary>
        /// 添加附件（自动识别文件类型）
        /// </summary>
        /// <param name="fileName">单个文件的路径</param>
        public void Attachments(string fileName)
        {
            mailMessage.Attachments.Add(new Attachment(fileName));
        }

        /// <summary>
        /// 添加附件（默认为富文本RTF格式）
        /// </summary>
        /// <param name="fileName">单个文件的路径</param>
        public void AttachmentsForRTF(string fileName)
        {
            mailMessage.Attachments.Add(new Attachment(fileName, MediaTypeNames.Application.Rtf));
        }
        #endregion
    }
}

　　调用是按照需求，自由设置参数。

using LeeStudio.Basic;

private void SendEmail()
{
    #region 最简设置
    //SendEmail se = new SendEmail("*****@****.com", "****@163.com", "title", "body");
    //se.SetSmtp("password", "smtp.163.com"); //必须在所有参数设置完后调用此方法
    #endregion

    #region 完全设置
    //string toAddresses = "***@**.**,***@**.**";
    //string toNames = "frank,lee";

    //SendEmail se = new SendEmail("to@**.**", "from@**.**", "toname", "fromname","title", "body", false);
    //se.SetMoreToAddress("to@**.**", "toName");
    //se.SetCarbonCopyFor("cc@**.**");
    //se.SetBlindCarbonCopyFor("bcc@**.**");

    //string filePath = Request.PhysicalApplicationPath + "/file/SendEmail.txt";
    //se.Attachments(filePath);
    //filePath = Request.PhysicalApplicationPath + "/file/RTF文件.docx";
    //se.AttachmentsForRTF(filePath);
    //se.SetSmtp("email", "password", "smtp", 25, true, System.Net.Mail.MailPriority.Normal); //必须在所有参数设置完后调用此方法
    #endregion
}

　　遗留问题：

　　当有多个收件人/抄送者/密送者时，如何快速处理？之前的做法是让用户输入字符串，再将字符串一一对应匹配，代码如下：

/// <summary>
/// 将邮件地址和名称加入到锯齿数组中
/// </summary>
/// <param name="addrs">邮件地址（多个以,号分开）</param>
/// <param name="names">名称（多个以,号分开）</param>
/// <returns>地址和名称数组</returns>
private string[][] SetNameList(string addrs, string names)
{
    string[][] result = new string[2][];

    string[] addr = addrs.Split(',');
    string[] name = names.Split(',');
    result[0] = new string[addr.Length];
    result[1] = new string[name.Length];

    for (int i = 0; i < addr.Length; i++)
        result[0][i] = addr[i];
    for (int i = 0; i < name.Length; i++)
        result[1][i] = name[i];

    return result;
}

　　首先这个方法就很奇葩，其次，只要用户输入的个数不对应，又要做一堆的异常处理……

　　

　　有好的方法望不吝赐教。