请问如何实现异步发送邮件？
在Web下开发，我想实现异步发送邮件的功能，比如说，在客户成功提交了一个订单时，程序首先保存订单，然后把这些数据发送邮件给管理员和客户，并向数据库插入发送邮件的记录，客户的数量可能是一个也可能很多，然后报告说订单提交成功。如果不用异步方式，那么当给很多客户发送邮件的时候就很耗时，用户就要等很久才能看到成功提示，因此我想，在保存了订单数据后，就用另一个线程来发送邮件，从而当前线程立即就可以向用户反馈订单提交成功的提示信息。
发邮件和插入发送记录的过程是否可以用异步实现？BackgroundWorker 是否可以用于web开发？
不知应怎样实现？希望有点示例代码，谢谢！
[解决办法]
用委托事件试试..
[解决办法]
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Net;
using System.Net.Mail;
using System.ComponentModel;
namespace SendLiWu
{
public class GmailSmtpEmail
{
/// <summary>
/// 返回为值表示发送成功
/// </summary>
private bool mailSent = false;
/// <summary>
/// Gmail的用户名:如: user@gmail.com
/// </summary>
private string username = "useemailsend@gmail.com";
/// <summary>
/// Gmail的密码
/// </summary>
private string password = "!123456789";
/// <summary>
/// Gmail的发送邮件服务器
/// </summary>
private string Host = "smtp.gmail.com";
/// <summary>
/// 端口号
/// </summary>
private int Port = 587;
/// <summary>
/// 发送Email要使用的编码
/// </summary>
private Encoding encoding=Encoding.GetEncoding("utf-8");
/// <summary>
/// 设置正文内容是否是包含Html的格式
/// </summary>
private bool bodyhtml=false;
/// <summary>
/// 设置电子邮件的优先级
/// </summary>
private MailPriority Priority = MailPriority.High;
/// <summary>
/// 是否使用套接字层安全加密连接
/// </summary>
private bool Ssl = true;
/// <summary>
/// 发送Email要使用的编码
/// </summary>
private string errormessage = "";
public string ErrorMessage
{
get { return errormessage; }
}
public Encoding Encoding
{
get { return encoding; }
set { encoding = value; }
}
/// <summary>
/// 设置正文内容是否是包含Html的格式
/// </summary>
public bool BodyHtml
{
get { return bodyhtml; }
set { bodyhtml = value; }
}
/// <summary>
/// 设置电子邮件的优先级
/// </summary>
public MailPriority priority
{
get { return Priority; }
set { Priority = value; }
}
/// <summary>
/// 发送单个Email
/// </summary>
/// <param name="Subject">主题</param>
/// <param name="Body">内容</param>
/// <param name="displayname">显示名</param>
/// <param name="addressee">收件人的Email地址</param>
public void SendMail(string Subject, string Body,string displayname, string addressee)
{
System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
msg.To.Add(addressee);
msg.From = new MailAddress(username, displayname,encoding);
msg.Subject =Subject;
msg.SubjectEncoding = encoding;
msg.Body =Body;
msg.BodyEncoding =encoding;
msg.IsBodyHtml =bodyhtml;
msg.Priority = Priority;
//Add the Creddentials
SmtpClient client = new SmtpClient();
client.Credentials = new System.Net.NetworkCredential(username,password);
client.Port =Port;//or use 587
client.Host =Host;
client.EnableSsl = Ssl;
client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);
object userState = msg;
try
{
//you can also call client.Send(msg)
client.SendAsync(msg, userState);
}
catch (System.Net.Mail.SmtpException ex)
{
mailSent = false;
this.errormessage = ex.Message;
throw new Exception(ex.Message, ex);
}
}
/// <summary>
/// 发送一个或者多个的Email
/// </summary>
/// <param name="Subject">主题</param>
/// <param name="Body">内容</param>
/// <param name="displayname">显示名</param>
/// <param name="emaillist">收件人Email的列表</param>
public void SendMail(string Subject, string Body, string displayname, string[] emaillist)
{
System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
for (int i = 0; i <= emaillist.Length - 1; i++)
{
msg.To.Add(emaillist[i].ToString());
}
msg.From = new MailAddress(username, displayname, encoding);
msg.Subject = Subject;
msg.SubjectEncoding = encoding;
msg.Body = Body;
msg.BodyEncoding = encoding;
msg.IsBodyHtml = bodyhtml;
msg.Priority = Priority;
//Add the Creddentials
SmtpClient client = new SmtpClient();
client.Credentials = new System.Net.NetworkCredential(username, password);
client.Port = Port;//or use 587
client.Host = Host;
client.EnableSsl = Ssl;
client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);
object userState = msg;
try
{
//you can also call client.Send(msg)
client.SendAsync(msg, userState);
}
catch (System.Net.Mail.SmtpException ex)
{
this.errormessage = ex.Message;
}
}
void client_SendCompleted(object sender, AsyncCompletedEventArgs e)
{
MailMessage mail = (MailMessage)e.UserState;
string subject = mail.Subject;
if (e.Cancelled)
{
mailSent = false;
}
if (e.Error != null)
{
mailSent = false;
}
mailSent = true;
}
}
}
注:
1,以上是对于WindForm发送Email的类
2,如果要变成对于Web发送Email的类
把 client.SendAsync(msg, userState);
改写成
client.Send(msg, userState);
[解决办法]
这个Email程序是采用异步来发送Email
采用Gmail的邮件发送系统
[解决办法]
Gmail的邮件发送服务器在国外,可以会比较慢,建议用雅虎的邮件发送服务器来发送,相对会快一些,不过月租要10元
引用来源:http://awfer1.blog.163.com/blog/
