C#实现按数据库邮件列表发送邮件的方法

using System;using System.Net;using System.Net.Mail;using System.Text;using System.Threading;delegate void sendDelegate(string from, string to, string subject, string body, string host, int port, string userName, string password);/// <summary>/// 发送电子邮件/// </summary>/// <param name="from">发件人</param>/// <param name="to">收件人</param>/// <param name="subject">邮件主题</param>/// <param name="body">邮件内容</param>/// <param name="host">发送服务地址(smtp.qq.com)</param>/// <param name="port">发送邮件服务器端口(25) int型</param>/// <param name="userName">用户名</param>/// <param name="password">密码</param>public void sendmail(string from, string to, string subject, string body, string host, int port, string userName, string password){ MailMessage message = new MailMessage(from, to, subject, body); message.IsBodyHtml = true; message.BodyEncoding = Text.Encoding.UTF8; message.Attachments.Add(new Attachment("c://log.log")); SmtpClient client = new SmtpClient(host, port); client.Credentials = new NetworkCredential(userName, password); client.DeliveryMethod = SmtpDeliveryMethod.Network; client.Send(message);}SqlConnection conn = new SqlConnection();conn.ConnectionString = "Data Source=(local);Integrated Security=SSPI;Initial Catalog=db_showHouse"; 　　//打开连接conn.Open();SqlCommandcmd = new SqlCommand("select Email from Employee", conn);SqlDataReader drNew = cmd.ExecuteReader();if (drNew.HasRows){ while (drNew.Read())  new sendDelegate(sendmail).BeginInvoke("someone@somecompany.com",drNew[0].ToString(),"subject","body","smtp.somescompany.com",25,"userName","password");}drNew.Close();