c#发送邮件，可发送多个附件

1：创建sendmail类

2：调用方法

sendmail send = new sendmail("[e-mail]", "[e-mail]", "邮件内容测试", "邮件标题测试", "mail20181224");
send.attachments(@"d:\\工作\\abc.txt");
send.attachments(@"d:\\工作\\123.txt");
send.send();

---------------------------------------------------------------------------------------------------下面是类-------------------------------------------------------------------------------------------------------------------------------

using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.net.mail;
using system.net.mime;

/// <summary>
/// sendmail 的摘要说明
/// </summary>
public class sendmail
{
private mailmessage mailmessage;
private smtpclient smtpclient;
private string password;//发件人密码 
/// <summary> 
/// 处审核后类的实例 
/// </summary> 
/// <param name="to">收件人地址</param> 
/// <param name="from">发件人地址</param> 
/// <param name="body">邮件正文</param> 
/// <param name="title">邮件的主题</param> 
/// <param name="password">发件人密码</param>
public sendmail(string to, string from, string body, string title, string password)
{
mailmessage = new mailmessage();
mailmessage.to.add(to);
mailmessage.from = new system.net.mail.mailaddress(from);
mailmessage.subject = title;
mailmessage.body = body;
mailmessage.isbodyhtml = true;
mailmessage.bodyencoding = system.text.encoding.utf8;
mailmessage.priority = system.net.mail.mailpriority.normal;
this.password = password;
}
/// <summary> 
/// 添加附件 
/// </summary> 
public void attachments(string path)
{
string[] path = path.split(',');
attachment data;
contentdisposition disposition;
for (int i = 0; i < path.length; i++)
{
data = new attachment(path[i], mediatypenames.application.octet);//实例化附件 
disposition = data.contentdisposition;
disposition.creationdate = system.io.file.getcreationtime(path[i]);//获取附件的创建日期 
disposition.modificationdate = system.io.file.getlastwritetime(path[i]);//获取附件的修改日期 
disposition.readdate = system.io.file.getlastaccesstime(path[i]);//获取附件的读取日期 
mailmessage.attachments.add(data);//添加到附件中 
}
}
/// <summary> 
/// 异步发送邮件 
/// </summary> 
/// <param name="completedmethod"></param> 
public void sendasync(sendcompletedeventhandler completedmethod)
{
if (mailmessage != null)
{
smtpclient = new smtpclient();
smtpclient.credentials = new system.net.networkcredential(mailmessage.from.address, password);//设置发件人身份的票据 
smtpclient.deliverymethod = system.net.mail.smtpdeliverymethod.network;
smtpclient.host = "smtp." + mailmessage.from.host;
smtpclient.sendcompleted += new sendcompletedeventhandler(completedmethod);//注册异步发送邮件完成时的事件 
smtpclient.sendasync(mailmessage, mailmessage.body);
}
}
/// <summary> 
/// 发送邮件 
/// </summary> 
public void send()
{
if (mailmessage != null)
{
smtpclient = new smtpclient();
smtpclient.credentials = new system.net.networkcredential(mailmessage.from.address, password);//设置发件人身份的票据 
smtpclient.deliverymethod = system.net.mail.smtpdeliverymethod.network;
smtpclient.host = "smtp." + mailmessage.from.host;
smtpclient.send(mailmessage);
}
}
}