我有一些旧代码可以很好地用于发送电子邮件，但 Visual Studio 告诉我该代码已过时，我应该将其更改为Net.Mailfrom Web.Mail。我已经重写了大部分内容，但我有几个问题。
这是原始的工作代码：
public void Send(string from, string to, string subject, string body, bool isHtml, string[] attachments)
{
var mailMessage = new MailMessage
{
From = from,
To = to,
Subject = subject,
Body = body,
BodyFormat = isHtml ? MailFormat.Html : MailFormat.Text
};
// Add attachments
if (attachments != null)
{
foreach (var t in attachments)
{
mailMessage.Attachments.Add(new Attachment(t));
}
}
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", 1);
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", _accountName);
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", _password);
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", _port.ToString(CultureInfo.InvariantCulture));
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", true);
SmtpMail.SmtpServer = _smtp;
SmtpMail.Send(mailMessage);
}
这是重写的部分（嗯，有点）：
public void Send2(string from, string to, string subject, string body, bool isHtml, string[] attachments)
{
var fromObj = new MailAddress(from);
var toObj = new MailAddress(to);
var mailMessage = new System.Net.Mail.MailMessage
{
From = fromObj,
Subject = subject,
Body = body,
IsBodyHtml = isHtml,
};
mailMessage.To.Add(toObj);
if (attachments != null)
{
foreach(var t in attachments)
{
mailMessage.Attachments.Add(new Attachment(t));
}
}
var smtp = new SmtpClient(_smtp) {Credentials = new NetworkCredential(_accountName, _password), Port = _port, EnableSsl = true};
smtp.Send(mailMessage);
}
如果您想知道，我在代码_port中_smtp设置了更高的值，分别为 465 和 smtp.gmail.com。
所以它似乎有效，但随后进入发送部分并吐出其中之一：
System.Net.Mail.SmtpException: The operation has timed out.
有没有我遗漏的东西，比如Fields原始代码中的，导致它超时？
谢谢！
解决方案
感谢DavidH指出正确的方向，端口需要从465更改为587（或 25；我使用前者没有问题）。