.NET常用方法——邮件发送

邮件发送类文件，可直接使用；

调用方法（实例化、静态调用）：

实例化：

string exception = "";

SendEmail.SendEmail SE = new SendEmail.SendEmail("aaa@163.com", "aaa", "smtp.163.com", "管理员");

SE.SendMails("aaa<aaa@qq.com>;aaa<aaa@hotmail.com>;", "你好", "您好！", new string[] { }, out exception);

静态使用

SendEmail.SendEmail.Sends("aaa@163.com", "aaa", "aaa", TextBox1.Text, TextBox2.Text, TextBox3.Text, "smtp.163.com", true, FilePaths, out exception);

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Mail;
using System.Net;
using System.Xml;
using System.Text.RegularExpressions;

namespace SendEmail
{
    public class SendEmail
    {
        /// <summary>
        /// 发送者邮箱地址
        /// </summary>
        private static string fromMailAddress;
        /// <summary>
        /// 发送者邮箱密码
        /// </summary>
        private static string fromMailPwd;
        /// <summary>
        /// 发送者邮箱SMTP
        /// </summary>
        private static string fromMailSMTP;
        /// <summary>
        /// 发送者邮箱显示名称
        /// </summary>
        private static string fromDisplayName;

        /// <summary>
        /// 构造基础参数
        /// </summary>
        /// <param name="frommailaddress">发送方邮箱地址</param>
        /// <param name="frommailpwd">发送方邮箱密码</param>
        /// <param name="frommailsmtp">发送方smtp地址</param>
        /// <param name="fromdisplayname">发送者邮箱显示名称</param>
        public SendEmail(string frommailaddress, string frommailpwd, string frommailsmtp, string fromdisplayname)
        {
            fromMailAddress = frommailaddress;
            fromMailPwd = frommailpwd;
            fromMailSMTP = frommailsmtp;
            fromDisplayName = fromdisplayname;
        }

        public SendEmail()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(System.Web.HttpContext.Current.Server.MapPath("~/SystemConfig.xml"));
            XmlNode ServerMail = doc.SelectSingleNode("/Condition/System/ServerMail");
            XmlNode PwdMail = doc.SelectSingleNode("/Condition/System/PwdMail");
            XmlNode SMTP = doc.SelectSingleNode("/Condition/System/SMTP");
            XmlNode DisplayName = doc.SelectSingleNode("/Condition/System/DisplayName");
            if (ServerMail != null && ServerMail.InnerText != "" && PwdMail != null && PwdMail.InnerText != "" && SMTP != null && SMTP.InnerText != "" && DisplayName != null && DisplayName.InnerText != "")
            {
                fromMailAddress = ServerMail.InnerText;
                fromMailPwd =  Encoding.Default.GetString(Convert.FromBase64String(doc.SelectSingleNode("/Condition/System/PwdMail").InnerText));
                fromMailSMTP = SMTP.InnerText;
                fromDisplayName = DisplayName.InnerText;
            }
        }

        /// <summary>
        /// 实例化后邮件发送
        /// </summary>
        /// <param name="ToEmails">接收邮件地址,lzy ＜lo_yung@163.com＞;</param>
        /// <param name="eSubject">邮件标题</param>
        /// <param name="eBody">邮件内容</param>
        /// <param name="FileNames">邮件附件,无附件为null</param>
        /// <param name="exception">未发送成功异常消息</param>
        /// <returns>是否发送成功</returns>
        public bool SendMails(string ToEmails, string eSubject, string eBody, string[] FileNames, out string exception)
        {
            bool Result = false;
            //实例化发送内容对象
            MailMessage oMail = new MailMessage();//创建一个MailMessage对象
            try
            {
                MailAddress from = new MailAddress(fromMailAddress, fromDisplayName);//设置发送者信息
                oMail.From = from;//设置发信人地址
                oMail.Subject = eSubject;//邮件标题
                oMail.Body = eBody; //邮件内容
                oMail.IsBodyHtml = true;   //指定邮件格式,支持HTML格式
                oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件采用的编码,字符集，缺省为"US-ASCII"
                oMail.Priority = MailPriority.High;//设置邮件的优先级为高
                oMail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;//发送结果通知
                if (FileNames.Length > )
                {
                    foreach (string filepath in FileNames)
                        oMail.Attachments.Add(new Attachment(filepath));//邮件添加附件
                }

                //实例化发送载体
                SmtpClient client = new SmtpClient();  //实例化发送邮件SMTP服务器
                client.Host = fromMailSMTP;    //指定邮件服务器
                client.UseDefaultCredentials = false;//凭据是否随请求一起发送,必须放在client.Credentials前
                client.Credentials = new NetworkCredential(fromMailAddress, fromMailPwd);//指定服务器邮件,及密码
                client.DeliveryMethod = SmtpDeliveryMethod.Network;//将邮件内容发送到SMTP服务器发出
                //接收邮件格式化
                if (ToEmails.Trim().IndexOf(";") != - && ToEmails.Trim().IndexOf("<") != - && ToEmails.Trim().IndexOf(">") != -)
                {
                    string[] mailNames = ToEmails.Trim().Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
                    foreach (string name in mailNames)
                    {
                        if (!string.IsNullOrEmpty(name))
                        {
                            string displayName = ""; string address = "";
                            //邮件格式loyung <lo_yung@163.com>;
                            if (name.IndexOf('<') > )
                            {
                                displayName = name.Substring(, name.IndexOf('<'));
                                address = name.Substring(name.IndexOf('<') + ).Replace('>', ' ');
                            }
                            oMail.To.Add(new MailAddress(address, displayName));
                        }
                    }
                }
                else
                {
                    Regex reg = new Regex("^\\s*([A-Za-z0-9_-]+(\\.\\w+)*@(\\w+\\.)+\\w{2,5})\\s*$");
                    if (reg.IsMatch(ToEmails.Trim()))
                    {
                        oMail.To.Add(new MailAddress(ToEmails.Trim(), ToEmails.Trim().Substring(, ToEmails.Trim().IndexOf("@"))));
                    }
                    else
                    {
                        exception = "邮箱格式不正确";
                        Result = false;
                    }
                }
                client.Send(oMail);  //发送邮件
                exception = "发送成功！";
                Result = true;
            }
            catch (Exception ex)
            {
                exception = ex.Message;
                Result = false;
            }
            finally
            {
                oMail.Dispose();   //释放资源
            }
            return Result;
        }

        /// <summary>
        /// 静态方法，发送邮件
        /// </summary>
        /// <param name="FromEmailAddress">发送方邮箱地址</param>
        /// <param name="FromDisplayName">发送方邮箱显示名称</param>
        /// <param name="FromPWD">发送方邮箱密码</param>
        /// <param name="ToEmails">接收邮件地址,lzy ＜lo_yung@163.com＞;</param>
        /// <param name="eSubject">邮件标题</param>
        /// <param name="eBody">邮件内容</param>
        /// <param name="SMTP">发送方smtp地址</param>
        /// <param name="IsBodyHtml">邮件内容是否以html呈现</param>
        /// <param name="FileNames">邮件附件,无附件为null</param>
        /// <param name="exception">未发送成功异常消息</param>
        /// <returns>是否发送成功</returns>
        public static bool Sends(string FromEmailAddress, string FromDisplayName, string FromPWD, string ToEmails, string eSubject, string eBody, string SMTP, bool IsBodyHtml, string[] FileNames, out string exception)
        {
            bool Result = false;
            //实例化发送内容对象
            MailMessage oMail = new MailMessage();//创建一个MailMessage对象
            try
            {
                MailAddress from = new MailAddress(FromEmailAddress, FromDisplayName);//设置发送者信息
                oMail.From = from;//设置发信人地址
                oMail.Subject = eSubject;//邮件标题
                oMail.Body = eBody; //邮件内容
                oMail.IsBodyHtml = true;   //指定邮件格式,支持HTML格式
                oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件采用的编码,字符集，缺省为"US-ASCII"
                oMail.Priority = MailPriority.High;//设置邮件的优先级为高
                oMail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;//发送结果通知
                if (FileNames.Length > )
                {
                    foreach (string filepath in FileNames)
                        oMail.Attachments.Add(new Attachment(filepath));//邮件添加附件
                }

                //实例化发送载体
                SmtpClient client = new SmtpClient();  //实例化发送邮件SMTP服务器
                client.Host = SMTP;    //指定邮件服务器
                client.UseDefaultCredentials = false;//凭据是否随请求一起发送,必须放在client.Credentials前
                client.Credentials = new NetworkCredential(FromEmailAddress, FromPWD);//指定服务器邮件,及密码
                client.DeliveryMethod = SmtpDeliveryMethod.Network;//将邮件内容发送到SMTP服务器发出
                //接收邮件格式化
                if (ToEmails.Trim().IndexOf(";") != - && ToEmails.Trim().IndexOf("<") != - && ToEmails.Trim().IndexOf(">") != -)
                {
                    string[] mailNames = ToEmails.Trim().Split(new string[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
                    foreach (string name in mailNames)
                    {
                        if (!string.IsNullOrEmpty(name))
                        {
                            string displayName = ""; string address = "";
                            //邮件格式loyung <lo_yung@163.com>;
                            if (name.IndexOf('<') > )
                            {
                                displayName = name.Substring(, name.IndexOf('<'));
                                address = name.Substring(name.IndexOf('<') + ).Replace('>', ' ');
                            }
                            oMail.To.Add(new MailAddress(address, displayName));
                        }
                    }
                }
                else
                {
                    Regex reg = new Regex("^\\s*([A-Za-z0-9_-]+(\\.\\w+)*@(\\w+\\.)+\\w{2,5})\\s*$");
                    if (reg.IsMatch(ToEmails.Trim()))
                    {
                        oMail.To.Add(new MailAddress(ToEmails.Trim(), ToEmails.Trim().Substring(, ToEmails.Trim().IndexOf("@"))));
                    }
                    else
                    {
                        exception = "邮箱格式不正确";
                        Result = false;
                    }
                }
                client.Send(oMail);  //发送邮件
                exception = "发送成功！";
                Result = true;
            }
            catch (Exception ex)
            {
                exception = ex.Message;
                Result = false;
            }
            finally
            {
                oMail.Dispose();   //释放资源
            }
            return Result;
        }

    }
}