Question

我是一名新的ASP.NET开发人员，我正在开发一个项目，管理员/系统可以在该项目中向用户发送电子邮件。由于我不希望管理员等到系统发送电子邮件，我计划使用SendAsync方法。

但是，我得到一个非常奇怪的错误

＆＃34;发现了SmtpExecption：发送邮件失败。＆＃34;

我无法解决它。

为了您的信息，我使用的是.NET Framework 4。

protected void btnSend_Click(object sender, EventArgs e)
    {
    try
            {
                Mailer mail = new Mailer();
                string senderE = ConfigurationManager.AppSettings["EmailID"].ToString();
                string senderName = "Test User"
                string recipientName = "TestSender";
                string subject = txtSubject.Text;
                string body = txtMessage.Text;
                mail.SendAsync(senderE, senderName, recipient, recipientName, subject, body);

                lblInfo.Text = "sent successfully :)";
                Response.Redirect("Test.aspx");
            }
            catch
            {
                lblInfo.Text = "Error!!!";
            }}

这是我的自定义Mailer类的SendAsync方法代码：

    public void SendAsync(string sender, string senderName, string recipient, string recipientName, string subject, string body)
        {
            var message = new MailMessage()
            {
                From = new MailAddress(sender, senderName),
                Subject = subject,
                Body = body,
                IsBodyHtml = true
            };
            message.To.Add(new MailAddress(recipient, recipientName));

            try
            {
                var client = new SmtpClient();
                client.SendCompleted += new SendCompletedEventHandler(MailDeliveryComplete);
                string userState = "Test";
                client.SendAsync(message, userState);
            }
            catch (Exception ex)
            {
                //handle exeption
                throw ex;
            }
            finally
            {
                //clean up.
                message.Dispose();
            }
        }

public static void MailDeliveryComplete(object sender, AsyncCompletedEventArgs e)
    {
        string message = "";
        // Get the unique identifier for this asynchronous operation.
        MailMessage mail = e.UserState as MailMessage;

        if (e.Error != null)
        {
            //handle error
            message = "Error " + e.Error.ToString() + " occurred";
        }
        else if (e.Cancelled)
        {
            //handle cancelled
            message = "Send canceled for mail with subject " + mail.ToString();
        }
        else
        {
            //handle sent email
            message = "Mail sent successfully";
        }

    }

那我该怎么办呢？

更新＃1：

顺便说一句，我正在保存Web.Config文件中的所有SMTP配置。以下是设置：

<system.net>
    <mailSettings>
      <smtp from="My Gmail Account" deliveryMethod="Network">
        <network enableSsl="true" host="smtp.gmail.com" port="587" userName="Username" password="Password" defaultCredentials="false"/>
      </smtp>
    </mailSettings>
  </system.net>

更新＃2： 在尝试了不同的建议之后，我将Async = True添加到了Page Directive，我收到了一条新的错误消息：

异步模块或处理程序在异步时完成手术还在等待。

我调试了代码，这次调试器进入MailDeliveryMethod并从以下块中抛出此错误：

if (e.Error != null)
        {
            //handle error
            message = "Error " + e.Error.ToString() + " occurred";
        }

有关我为何会遇到此类错误的想法吗？

如何修复这个C＃SendAsync方法？

0 个答案: