using System; using System.Collections.Generic; using System.Text; using System.Net.Mail; using System.Net; namespace MyQuery.Utils {     /// <summary>     /// 封装邮件处理     /// by 贾世义 2011-6-3     /// </summary>     public static class MailHelper     {         private static string smtpHost = null;         private static int smptPort = 25;         private static bool smtpIsUserCredentials = false;         private static string smtpCredentialAccount = null;         private static string smtpCredentialPassword = null;         /// <summary>         /// 设置发送邮件参数         /// </summary>         /// <param name="host">smtp服务器地址或名称</param>         /// <param name="port">smtp服务端口 一般为25</param>         /// <param name="isUserCredentials">是否需要认证</param>         /// <param name="account">需要认证时的用户</param>         /// <param name="password">需要认证时的用户的密码</param>         public static void SetParameters(string host, int port, bool isUserCredentials, string account, string password)         {             smtpHost = host;             smptPort = port;             smtpIsUserCredentials = isUserCredentials;             smtpCredentialAccount = account;             smtpCredentialPassword = password;         }         /// <summary>         /// 设置发送邮件参数 取配置         /// </summary>         private static void setParameters()         {             if (String.IsNullOrEmpty(smtpHost))             {                 smtpHost = WebHelper.GetAppConfig("SmtpHost");                 smptPort = DataHelper.GetIntValue(WebHelper.GetAppConfig("SmptPort"), 25);                 smtpIsUserCredentials = Constants.TRUE_ID.Equals(WebHelper.GetAppConfig("SmtpIsUserCredentials"));                 smtpCredentialAccount = WebHelper.GetAppConfig("SmtpCredentialAccount");                 smtpCredentialPassword = WebHelper.GetAppConfig("SmtpCredentialPassword");             }         }         /// <summary>         /// 发送邮件 发送邮件错误不会抛出异常         /// </summary>         /// <param name="receivers">收件人</param>         /// <param name="title">标题/主题</param>         /// <param name="content">信件内容</param>         /// <param name="sender">发件人 空则取系统配置</param>         public static void SendMail(string receivers, string title, string content, string sender)         {             if (!String.IsNullOrEmpty(receivers))             {                 //初始化参数                 setParameters();                 if (!String.IsNullOrEmpty(smtpHost))                 {                     try                     {                         SmtpClient smtp = new SmtpClient(smtpHost, smptPort);                         if (smtpIsUserCredentials)                         {                             smtp.UseDefaultCredentials = true;                             smtp.Credentials = new NetworkCredential(smtpCredentialAccount, smtpCredentialPassword); ;                         }                         smtp.DeliveryMethod = SmtpDeliveryMethod.Network;                         if (String.IsNullOrEmpty(sender))                         {                             sender = smtpCredentialAccount;                         }                         foreach (string receiver in DataHelper.GetStrings(receivers))                         {                             MailMessage msg = new MailMessage(sender, receiver, title, content);                             msg.BodyEncoding = Encoding.UTF8;                             msg.SubjectEncoding = Encoding.UTF8;                             msg.IsBodyHtml = true;                             smtp.Send(msg);                             msg.Dispose();                         }                     }                     catch { }                 }             }         }     } }