C#最初采用的是System.Web.Mail命名空间下的类发送邮件,后来经过改进,采用System.Net.Mail命名空间下的类发送邮件.当然前者仍然可用,只是后者功能更强大.
用System.Net.Mail发送邮件的原理如下:
核心就是调用SmtpClient类的send(newMessage)方法,其中的参数newMessage是一个MailMessage对象,所以我们在调用send(newMessage)方法前,须实例化MailMessage类,然后对newMessage的属性设值。
引用llsen http://hi.csdn.net/link.php?url=http://blog.csdn.net%2Fllsen：
using System.Net.Mail;
using System.Net.Mime;
using System.Net;
public static void CreateMessageWithAttachment(string server)
{
// Specify the file to be attached and sent.
// This example assumes that a file named Data.xls exists in the
// current working directory.
string file = @"D:\asdf.txt";
// Create a message and set up the recipients.
MailMessage message = new MailMessage(
"asdf@163.com",
"asdf@163.com",
"test",
"no du");
// Create the file attachment for this e-mail message.
Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
// Add time stamp information for the file.
ContentDisposition disposition = data.ContentDisposition;
disposition.CreationDate = System.IO.File.GetCreationTime(file);
disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
// Add the file attachment to this e-mail message.
message.Attachments.Add(data);
//Send the message.
SmtpClient client = new SmtpClient(server);
// Add credentials if the SMTP server requires them.
//client.Credentials = CredentialCache.DefaultNetworkCredentials;
client.UseDefaultCredentials = true;
client.Credentials = new System.Net.NetworkCredential("username", "password");
client.Send(message);
// Display the values in the ContentDisposition for the attachment.
ContentDisposition cd = data.ContentDisposition;
Console.WriteLine("Content disposition");
Console.WriteLine(cd.ToString());
Console.WriteLine("File {0}", cd.FileName);
Console.WriteLine("Size {0}", cd.Size);
Console.WriteLine("Creation {0}", cd.CreationDate);
Console.WriteLine("Modification {0}", cd.ModificationDate);
Console.WriteLine("Read {0}", cd.ReadDate);
Console.WriteLine("Inline {0}", cd.Inline);
Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
foreach (DictionaryEntry d in cd.Parameters)
{
Console.WriteLine("{0} = {1}", d.Key, d.Value);
}
data.Dispose();
}
protected void Timer1_Tick(object sender, EventArgs e)
{
if (DateTime.Now.Second % 20 == 0)
{
CreateMessageWithAttachment("smtp.163.com");
}
}
备注：
当使用Google-Gmail邮箱发送邮件时，Google使用了SSL（安全套接字层）加密链接。
Google的smtp服务器.Host = "smtp.gmail.com";
Google的smtp端口.Port = 587;
Google的SSL的EnableSsl必须设置为true *.EnableSsl = true；
这里再引用博客园-武广敬的一些代码，以备日后查看，谢谢
[Mail.cs]
using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Mail;
using System.Net;
using log4net;
using System.Configuration;
namespace MasterSoft.WinUI
{
/// <summary>
/// 发邮件模块
/// Author:tonyepaper.cnblogs.com
/// </summary>
public class Mail
{
private string senderAddress;
/// <summary>
/// 发件人
/// </summary>
public string SenderAddress
{
get { return senderAddress; }
set { senderAddress = value; }
}
private string receiverAddess;
/// <summary>
/// 收件人
/// </summary>
public string ReceiverAddess
{
get { return receiverAddess; }
set { receiverAddess = value; }
}
private string subject;
/// <summary>
/// 主题
/// </summary>
public string Subject
{
get { return subject; }
set { subject = value; }
}
private string body;
/// <summary>
/// 内容
/// </summary>
public string Body
{
get { return body; }
set { body = value; }
}
private string smtpHost;
/// <summary>
/// SMTP主机
/// </summary>
public string SmtpHost
{
get { return smtpHost; }
set { smtpHost = value; }
}
private int smtpPort;
/// <summary>
/// SMTP端口
/// </summary>
public int SmtpPort
{
get { return smtpPort; }
set { smtpPort = value; }
}
private string smtpPassword;
/// <summary>
/// SMTP密码
/// </summary>
public string Password
{
get { return smtpPassword; }
set { this.smtpPassword = value; }
}
/// <summary>
/// 从配置文件中读出SMTP相关信息
/// </summary>
public Mail()
{
senderAddress = ConfigurationManager.AppSettings["SmtpUser"];
smtpPassword = ConfigurationManager.AppSettings["SmtpPassword"];
smtpHost = ConfigurationManager.AppSettings["SmtpHost"];
smtpPort = Int32.Parse(ConfigurationManager.AppSettings["SmtpPort"]);
}
/// <summary>
/// 邮件
/// </summary>
/// <param name="receiverAddess">收件人地址</param>
/// <param name="subject">主题</param>
/// <param name="body">内容</param>
public Mail(string receiverAddess, string subject, string body):this()
{
this.receiverAddess = receiverAddess;
this.subject = subject;
this.body = body;
}
/// <summary>
/// 发送邮件
/// </summary>
public bool Send()
{
MailMessage mailMessage = new MailMessage(senderAddress, receiverAddess);
mailMessage.Subject = subject;
mailMessage.Body = body;
SmtpClient smtpClient = new SmtpClient(smtpHost, smtpPort);
//使用SSL加密连线
smtpClient.EnableSsl=true;
NetworkCredential networkCredential = new NetworkCredential(senderAddress, smtpPassword);
smtpClient.Credentials = networkCredential;
try
{
smtpClient.Send(mailMessage);
return true;
}
catch (Exception ex)
{
return false;
}
}
}
}
发现一个问题.如果使用465端口就会发生超时的错误.使用587就不会.奇怪.不过使用FoxMail来用465端口发信就正常.知道原因的请指点一下.谢谢!
[App.config]
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="SmtpHost" value="smtp.gmail.com"/>
<add key="SmtpPort" value="587"/>
<add key="SmtpUser" value="tonyxxx@gmail.com"/>
<add key="SmtpPassword" value="*******"/>
</appSettings>
</configuration>
尽管设置了这些，但我个人测试的C#写的Gmail的客户端貌似还发送不了邮件，真不知道什么原因。
郁闷，如有人知道为什么，请告诉我；如有源代码更好，我的个人Email兼MSN：hn-zjf@hotmail.com，
发过来一份参考下，谢谢。
来源：https://www.cnblogs.com/GT_Andy/archive/2009/11/10/1921955.html