Mail.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Mail;
using System.Text;


/// <summary>
/// 发送电子邮件类
/// </summary>
public class Mail
{
    /// <summary>
    /// 发送电子邮件函数
    /// </summary>
    /// <param name="txtHost">电子邮件服务主机名称</param>
    /// <param name="txtFrom">发送人地志</param>
    /// <param name="txtPass">发信人密码</param>
    /// <param name="txtTo">收信人地址</param>
    /// <param name="txtSubject">邮件标题</param>
    /// <param name="txtBody">邮件内容</param>
    /// <param name="isBodyHtml">是否采用HTML编码</param>
    /// <param name="priority">电子邮件的优先级别</param>
    /// <param name="encoding">内容采用的编码方式</param>
    /// <param name="files">附件（可选填）</param>
    /// <returns>操作结果</returns>
    public static string SendMail(string txtHost, string txtFrom, string txtPass, string txtTo, string txtSubject, string txtBody, bool isBodyHtml, MailPriority priority, System.Text.Encoding encoding, params string[] files)
    {
        //电子邮件附件
        Attachment data = null;
        //传送的电子邮件类
        MailMessage message = new MailMessage(txtFrom, txtTo);

        //设置标题
        message.Subject = txtSubject;
        //设置内容
        message.Body = txtBody;
        //是否采用HTML编码
        message.IsBodyHtml = isBodyHtml;
        //电子邮件的优先级别
        message.Priority = priority;
        //内容采用的编码方式
        message.BodyEncoding = encoding;
        try
        {
            //添加附件
            if (files.Length > 0 && files != null)
            {
                for (int i = 0; i < files.Length; i++)
                {
                    //实例话电子邮件附件，并设置类型
                    data = new Attachment(files[i], System.Net.Mime.MediaTypeNames.Application.Octet);
                    //实例邮件内容
                    System.Net.Mime.ContentDisposition disposition = data.ContentDisposition;
                    //取得建档日期
                    disposition.CreationDate = System.IO.File.GetCreationTime(files[i]);
                    //取得附件修改日期
                    disposition.ModificationDate = System.IO.File.GetLastWriteTime(files[i]);
                    //取得读取日期
                    disposition.ReadDate = System.IO.File.GetLastAccessTime(files[i]);
                    //设定文件名称
                    System.IO.FileInfo fi = new System.IO.FileInfo(files[i]);
                    disposition.FileName = fi.Name.ToString();
                    //添加附件
                    message.Attachments.Add(data);
                }
            }
            //实例从送电子邮件类
            SmtpClient client = new SmtpClient();
            //设置电子邮件主机名称
            client.Host = txtHost;
            //取得寄信人认证
            client.Credentials = new NetworkCredential(txtFrom, txtPass);
            //发送电子邮件
            client.Send(message);
            return "OK";
        }
        catch (Exception Err)
        {
            //返回错误信息
            return Err.Message;
        }
        finally
        {
            //销毁电子邮件附件
            if (data != null)
            {
                data.Dispose();
            }
            //销毁传送的电子邮件实例
            message.Dispose();
        }
    }

    /// <summary>
    /// 群发送电子邮件函数
    /// </summary>
    /// <param name="txtHost">电子邮件服务主机名称</param>
    /// <param name="txtFrom">发送人地志</param>
    /// <param name="txtPass">发信人密码</param>
    /// <param name="txtTo">收信人地址</param>
    /// <param name="txtSubject">邮件标题</param>
    /// <param name="txtBody">邮件内容</param>
    /// <param name="isBodyHtml">是否采用HTML编码</param>
    /// <param name="priority">电子邮件的优先级别</param>
    /// <param name="encoding">内容采用的编码方式</param>
    /// <param name="files">附件（可选填）</param>
    /// <returns>操作结果</returns>
    public static string MassSendMail(string txtHost, string txtFrom, string txtPass, string txtTo, string txtSubject, string txtBody, bool isBodyHtml, MailPriority priority, System.Text.Encoding encoding, params string[] files)
    {
        //电子邮件附件
        Attachment data = null;
        //传送的电子邮件类
        MailMessage message = new MailMessage();
        message.From = new MailAddress(txtFrom);
        message.CC.Add(txtTo);

        //设置标题
        message.Subject = txtSubject;
        //设置内容
        message.Body = txtBody;
        //是否采用HTML编码
        message.IsBodyHtml = isBodyHtml;
        //电子邮件的优先级别
        message.Priority = priority;
        //内容采用的编码方式
        message.BodyEncoding = encoding;
        try
        {
            //添加附件
            if (files.Length > 0 && files != null)
            {
                for (int i = 0; i < files.Length; i++)
                {
                    //实例话电子邮件附件，并设置类型
                    data = new Attachment(files[i], System.Net.Mime.MediaTypeNames.Application.Octet);
                    //实例邮件内容
                    System.Net.Mime.ContentDisposition disposition = data.ContentDisposition;
                    //取得建档日期
                    disposition.CreationDate = System.IO.File.GetCreationTime(files[i]);
                    //取得附件修改日期
                    disposition.ModificationDate = System.IO.File.GetLastWriteTime(files[i]);
                    //取得读取日期
                    disposition.ReadDate = System.IO.File.GetLastAccessTime(files[i]);
                    //设定文件名称
                    System.IO.FileInfo fi = new System.IO.FileInfo(files[i]);
                    disposition.FileName = fi.Name.ToString();
                    //添加附件
                    message.Attachments.Add(data);
                }
            }
            //实例从送电子邮件类
            SmtpClient client = new SmtpClient();
            //设置电子邮件主机名称
            client.Host = txtHost;
            //取得寄信人认证
            client.Credentials = new NetworkCredential(txtFrom, txtPass);
            //发送电子邮件
            client.Send(message);
            return "OK";
        }
        catch (Exception Err)
        {
            //返回错误信息
            return Err.Message;
        }
        finally
        {
            //销毁电子邮件附件
            if (data != null)
            {
                data.Dispose();
            }
            //销毁传送的电子邮件实例
            message.Dispose();
        }
    }

}