Question

我正在测试从C＃发送电子邮件，因为它使用以下代码：

        MailMessage message = new MailMessage();
        message.To.Add("user@gmail.com");
        message.From = new MailAddress("me@server.com");
        message.Subject = "Test subject";
        message.Body = "Test body";

        SmtpClient client = new SmtpClient("server");
        client.Timeout = 10000;
        client.EnableSsl = true;
        client.UseDefaultCredentials = false;

        NetworkCredential credentials = new NetworkCredential("me@server.com", "CorrectPassword");
        client.Credentials = credentials;
        try
        {
            client.Send(message); // OK
        }
        catch (Exception ex)
        {
            MessageBox.Show("Exception caught in CreateTestMessage2(): {0}",  ex.ToString());
        }

然后，尝试开始控制连接中断和主要是无效密钥的异常，但是请注意，即使使用了错误的密钥，邮件仍会发送。

        NetworkCredential credentials = new NetworkCredential("me@server.com", "BadPassword");
        client.Credentials = credentials;
        try
        {
            client.Send(message); // OK, the email has been sent
        }
        catch (Exception ex)
        {
            MessageBox.Show("Exception caught in CreateTestMessage2(): {0}",  ex.ToString());
        }

如何禁用自动保存凭据？或者，如何删除存储的凭据？

Answer 1

SmtpClient关于这两个属性（UseDefaultCredentials和Credentials）的工作方式由代码MS决定。这是它们的实现方式：

public bool UseDefaultCredentials {
            get {
                return (transport.Credentials is SystemNetworkCredential) ? true : false;
            }
            set {
                if (InCall) {
                    throw new InvalidOperationException(SR.GetString(SR.SmtpInvalidOperationDuringSend));
                }

                transport.Credentials = value ? CredentialCache.DefaultNetworkCredentials : null;
            }
        }


        public ICredentialsByHost Credentials {
            get {
                return transport.Credentials;
            }
            set {
                if (InCall) {
                    throw new InvalidOperationException(SR.GetString(SR.SmtpInvalidOperationDuringSend));
                }

                transport.Credentials = value;
            }
        }

这让我前行了，因为我在设置凭据后将默认值设置为false，而我无法让gmail进行身份验证。如果您深入了解有关SmtpClient和SmtpTransport的代码，该代码似乎仅在第一次发送请求期间一次建立连接。因此，似乎无法在同一客户端中再次“设置”凭据。如果我正确地读取了代码，那么即使在第一次发送请求后再次调用UseDefaultCredentials也无法正常工作。据我所知，这段代码是导致它发生的原因：

private void GetConnection()
    {
        if (!_transport.IsConnected)
        {
            _transport.GetConnection(_host, _port);
        }
    }

如果您想深入了解MS开源代码，请点击这里。

https://source.dot.net/#System.Net.Mail/System/Net/Mail/SmtpClient.cs https://source.dot.net/#System.Net.Mail/System/Net/Mail/SmtpTransport.cs

C＃-电子邮件-防止记住凭证

1 个答案: