private static async Task SendMailExImplAsync(
System.Net.Mail.SmtpClient client,
System.Net.Mail.MailMessage message,
CancellationToken token)
{
token.ThrowIfCancellationRequested();
var tcs = new TaskCompletionSource <bool>();
System.Net.Mail.SendCompletedEventHandler handler = null;
Action unsubscribe = () => client.SendCompleted -= handler;
handler = async(s, e) =>
{
unsubscribe();
// a hack to complete the handler asynchronously
await Task.Yield();
if (e.UserState != tcs)
{
tcs.TrySetException(new InvalidOperationException("Unexpected UserState"));
}
else if (e.Cancelled)
{
tcs.TrySetCanceled();
}
else if (e.Error != null)
{
tcs.TrySetException(e.Error);
}
else
{
tcs.TrySetResult(true);
}
};
client.SendCompleted += handler;
try
{
client.SendAsync(message, tcs);
using (token.Register(() => client.SendAsyncCancel(), useSynchronizationContext: false))
{
await tcs.Task;
}
}
finally
{
unsubscribe();
}
}
public void SendAsync(System.Net.Mail.SendCompletedEventHandler ac)
{
//使用指定的邮件地址初始化MailAddress实例
MailAddress maddr = new MailAddress(mailFrom);
//初始化MailMessage实例
MailMessage myMail = new MailMessage();
//向收件人地址集合添加邮件地址
if (mailToArray != null)
{
for (int i = 0; i < mailToArray.Length; i++)
{
myMail.To.Add(mailToArray[i].ToString());
}
}
//向抄送收件人地址集合添加邮件地址
if (mailCcArray != null)
{
for (int i = 0; i < mailCcArray.Length; i++)
{
myMail.CC.Add(mailCcArray[i].ToString());
}
}
//发件人地址
myMail.From = maddr;
//电子邮件的标题
myMail.Subject = mailSubject;
//电子邮件的主题内容使用的编码
myMail.SubjectEncoding = Encoding.UTF8;
//电子邮件正文
myMail.Body = mailBody;
//电子邮件正文的编码
myMail.BodyEncoding = Encoding.Default;
myMail.Priority = MailPriority.High;
myMail.IsBodyHtml = isbodyHtml;
//在有附件的情况下添加附件
try
{
if (attachmentsPath != null && attachmentsPath.Length > 0)
{
Attachment attachFile = null;
foreach (string path in attachmentsPath)
{
attachFile = new Attachment(path);
myMail.Attachments.Add(attachFile);
}
}
}
catch (Exception err)
{
throw new Exception("在添加附件时有错误:" + err);
}
SmtpClient smtp = new SmtpClient();
//指定发件人的邮件地址和密码以验证发件人身份
smtp.Credentials = new System.Net.NetworkCredential(mailFrom, mailPwd);
//设置SMTP邮件服务器
smtp.Host = host;
smtp.Port = port;
smtp.EnableSsl = true;
smtp.SendCompleted += ac;
smtp.SendAsync(myMail, null);
}
