c# 邮件发送通用类

此类的功能包括发送邮件，邮箱格式是否正确，和在不发送邮件的情况下判断邮箱用户名和密码是否正确，鉴于POP检查邮箱用户名和密码出现错误情况返回结果的延迟，用异步线程解决此问题，见代码
[csharp]
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Net.Mail; 
using System.Web; 
using System.Net; 
using System.Text.RegularExpressions; 
using System.Net.Sockets; 
using System.IO; 
using System.Collections; 
using System.Threading; 
 
namespace Com.Web 
{ 
    /// <summary> 
    /// 邮箱类 
    /// </summary> 
    public class CheckEmailInfo 
    { 
        public string server { get; set; }//服务器 
        public string user { get; set; }//用户名 
        public string pwd { get; set; }//密码 
    } 
 
    /// <summary> 
    /// SendEmail通用类，通过smtp服务器发送邮件 
    /// </summary> 
    public class SendEmail 
    { 
        public Dictionary<string, string> smtpServer; 
        public Dictionary<string, string> popServer; 
 
        public  SendEmail() 
        {           
            IniSmtpServer(); 
            IniPopServer(); 
        } 
 
        /// <summary> 
        /// 初始化常用smtpServer，用于绑定下拉选择菜单 
        /// </summary> 
        private void IniSmtpServer() 
        { 
            smtpServer = new Dictionary<string, string>(); 
            smtpServer.Add("网易163邮箱", "smtp.163.com"); 
            smtpServer.Add("网易vip.163邮箱", "smtp.vip.163.com"); 
            smtpServer.Add("网易126邮箱", "smtp.126.com"); 
            smtpServer.Add("网易188邮箱", "smtp.188.com"); 
            smtpServer.Add("新浪邮箱", "smtp.sina.com"); 
            smtpServer.Add("雅虎邮箱", "smtp.mail.yahoo.com"); 
            smtpServer.Add("搜狐邮箱", "smtp.sohu.com"); 
            smtpServer.Add("TOM邮箱", "smtp.tom.com"); 
            smtpServer.Add("Gmail邮箱", "smtp.gmail.com"); 
            smtpServer.Add("QQ邮箱", "smtp.qq.com"); 
            smtpServer.Add("QQ企业邮箱", "smtp.biz.mail.qq.com"); 
            smtpServer.Add("139邮箱", "smtp.139.com"); 
            smtpServer.Add("263邮箱", "smtp.263.com");             
        } 
 
        /// <summary> 
        /// 初始化常用popServer，用于绑定下拉选择菜单 
        /// </summary> 
        private void IniPopServer() 
        { 
            popServer = new Dictionary<string, string>(); 
            popServer.Add("网易163邮箱", "pop3.163.com"); 
            popServer.Add("网易vip.163邮箱", "pop3.vip.163.com"); 
            popServer.Add("网易126邮箱", "pop3.126.com"); 
            popServer.Add("网易188邮箱", "pop3.188.com"); 
            popServer.Add("新浪邮箱", "pop3.sina.com"); 
            popServer.Add("雅虎邮箱", "pop3.mail.yahoo.com"); 
            popServer.Add("搜狐邮箱", "pop3.sohu.com"); 
            popServer.Add("TOM邮箱", "pop.tom.com"); 
            popServer.Add("Gmail邮箱", "pop.gmail.com"); 
            popServer.Add("QQ邮箱", "pop.qq.com"); 
            popServer.Add("QQ企业邮箱", "pop.biz.mail.qq.com"); 
            popServer.Add("139邮箱", "pop.139.com"); 
            popServer.Add("263邮箱", "pop.263.com"); 
        } 
 
        /// <summary> 
        /// 发送邮件功能 
        /// </summary> 
        /// <param name="fromEmail">登录邮箱</param> 
        /// <param name="password">登录密码</param> 
        /// <param name="user">邮件昵称</param> 
        /// <param name="title">邮件标题</param> 
        /// <param name="toEmail">邮件地址</param> 
        /// <param name="email">邮件内容</param> 
        /// <param name="smtpServer">smtp服务器</param> 
        public bool SendMessage(string fromEmail,string password, string user, string title, string toEmail, string email,string smtpServer) 
        { 
            try 
            {               
                SmtpClient smtp = new SmtpClient(); //实例化一个SmtpClient 
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network; //将smtp的出站方式设为 Network 
                smtp.EnableSsl = false;//smtp服务器是否启用SSL加密 
                smtp.Host = smtpServer;//指定 smtp 服务器                    
                smtp.Credentials = new NetworkCredential(fromEmail, password); 
                MailMessage mm = new MailMessage(); //实例化一个邮件类 
                mm.Priority = MailPriority.High; //邮件的优先级，分为 Low, Normal, High，通常用 Normal即可               
                mm.From = new MailAddress(fromEmail, user, Encoding.GetEncoding(936)); 
                mm.CC.Add(new MailAddress(toEmail, "", Encoding.GetEncoding(936))); 
                mm.Subject = title; //邮件标题 
                mm.SubjectEncoding = Encoding.GetEncoding(936); 
                mm.IsBodyHtml = true; //邮件正文是否是HTML格式mm.BodyEncoding = Encoding.GetEncoding(936); 
                mm.Body = email; 
                smtp.Send(mm); 
                return true;           
            } 
            catch 
            { 
                return false; 
            } 
        } 
 
        /// <summary> 
        /// 检查邮箱是否正确的委托 
        /// </summary> 
        delegate bool MyDelegate(object checkEmailInfo); 
 
        /// <summary> 
        /// 利用异步方式检查邮箱账号和密码是否正确 
        /// </summary> 
        public bool CheckUser(string server, string user, string pwd) 
        {            
            MyDelegate myDelegate = new MyDelegate(CheckUser); 
            CheckEmailInfo checkEmailInfo = new CheckEmailInfo(); 
            checkEmailInfo.server = server; 
            checkEmailInfo.user = user; 
            checkEmailInfo.pwd = pwd; 
            IAsyncResult result = myDelegate.BeginInvoke(checkEmailInfo, null, null); 
            Thread.Sleep(1000);//主线程1秒后检查异步线程是否运行完毕 
            if (result.IsCompleted) 
            { return myDelegate.EndInvoke(result); }//如果错误的邮箱和密码，函数将会运行很慢 
            else 
            { return false; } 
        } 
       
 
        /// <summary> 
        /// 判断用户邮箱账号和密码是否正确 
        /// </summary> 
        /// <param name="server">PopServer地址</param> 
        /// <param name="user">用户名</param> 
        /// <param name="pwd">密码</param> 
        private bool CheckUser(object checkEmailInfo) 
        {           
            CheckEmailInfo checkInfo = (CheckEmailInfo)checkEmailInfo; 
            TcpClient sender = new TcpClient(checkInfo.server, 110);//pop协议使用TCP的110端口 
            Byte[] outbytes; 
            NetworkStream ns; 
            StreamReader sr; 
            string input; 
            string readuser = string.Empty; 
            string readpwd = string.Empty; 
            try 
            { 
                ns = sender.GetStream(); 
                sr = new StreamReader(ns); 
                sr.ReadLine(); 
                //检查用户名和密码 
                input = "user " + checkInfo.user+ "\r\n"; 
                outbytes = Encoding.ASCII.GetBytes(input.ToCharArray()); 
                ns.Write(outbytes, 0, outbytes.Length);              
                readuser = sr.ReadLine(); 
                input = "pass " + checkInfo.pwd + "\r\n"; 
                outbytes =Encoding.ASCII.GetBytes(input.ToCharArray()); 
                ns.Write(outbytes, 0, outbytes.Length);            
                readpwd = sr.ReadLine();                            
                if (readuser.Substring(0, 3) == "+OK" && readpwd.Substring(0, 3) == "+OK") 
                { return true; } 
                else 
                { return false; } 
            } 
            catch 
            { 
                return false; 
            } 
        } 
         
        /// <summary> 
        /// 判断邮箱格式是否正确 
        /// </summary> 
        /// <param name="email">邮箱地址</param> 
        public bool IsEmail(string email) 
        {  
            string paterner = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"; 
            if (!Regex.IsMatch(email, paterner)) 
            { return false;} 
            else 
            {return true;}          
        }   
    } 
}