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如何在通过 SmtpMailClient.SendAsync() 发送邮件之前阻止应用程序退出

发布于 2024-12-01 05:11:25 字数 143 浏览 1 评论 0原文

我在通过 SmtpMailClient.SendAsync() 发送邮件时遇到问题，即如果应用程序在 SmtpMailClient.SendAsync() 之后立即关闭，则不会发送邮件。

那么如何强制应用程序在回调之前不关闭呢？

谢谢！！

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So要识趣 2024-12-08 05:11:25

SmtpClient 有一个 SendCompleted 事件。以下是有关如何实现它的示例代码： http://www.systemnetmail.com/faq/4.6 .aspx

根据您的平台，您需要实现某种 Application 对象，该对象对挂起的 SendAsync 操作进行计数，并且仅在它们为 0 时才允许应用程序结束。

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温柔嚣张 2024-12-08 05:11:25

添加 SendCompleted http://msdn.microsoft。 com/en-us/library/system.net.mail.smtpclient.sendcompleted.aspx 事件处理程序到您的 SmtpClient 对象。

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原谅过去的我 2024-12-08 05:11:25

我认为问题实际上是：如何拦截退出命令并根据应用程序状态推迟它？

对于 WinForms：

protected override void OnFormClosing(FormClosingEventArgs e) 
{ 
    if (isSending) 
    { 
        quitOnSent = true; // make it so the quit will eventually happen
        e.Cancel = true; // prevent the quit for now
    } 
    base.OnFormClosing(e); 
} 

void SmtpClient_OnCompleted(object sender, AsyncCompletedEventArgs e)
{
    if(quitOnSent) this.Close(); // now quit
}

I think the question is really: How do you intercept a quit command and defer it based on application state?

For WinForms:

protected override void OnFormClosing(FormClosingEventArgs e) 
{ 
    if (isSending) 
    { 
        quitOnSent = true; // make it so the quit will eventually happen
        e.Cancel = true; // prevent the quit for now
    } 
    base.OnFormClosing(e); 
} 

void SmtpClient_OnCompleted(object sender, AsyncCompletedEventArgs e)
{
    if(quitOnSent) this.Close(); // now quit
}

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Hello爱情风 2024-12-08 05:11:25

最后通过使用 bool 变量来查找邮件是否已发送。

代码：

   public static bool mailsent ;

   // I am not posting the mail sending code as its available every where.

    private void sendMailComplete(Object sender, System.ComponentModel.AsyncCompletedEventArgs e)
    {

        MailMessage msd = e.UserState as MailMessage;

        if (!e.Cancelled) 
        {
            MessageBox.Show("Cancelled");
        }
         if (e.Error != null)
        {
            MessageBox.Show("Error");

        }

        else
        {
            mailsent = true;
        }

    }

现在在 FormClosing 事件中

    private void MainForm_FormClosing(object sender, FormClosingEventArgs e){

        if (!mailsent)
        {
            MessageBox.Show("Please wait, Mail Sending in Process !!! ");
            e.Cancel = true;
        }
    }

希望它有帮助！

Finally did it by using a bool variable to find whether the mail is sent or not.

code:

   public static bool mailsent ;

   // I am not posting the mail sending code as its available every where.

    private void sendMailComplete(Object sender, System.ComponentModel.AsyncCompletedEventArgs e)
    {

        MailMessage msd = e.UserState as MailMessage;

        if (!e.Cancelled) 
        {
            MessageBox.Show("Cancelled");
        }
         if (e.Error != null)
        {
            MessageBox.Show("Error");

        }

        else
        {
            mailsent = true;
        }

    }

Now in the FormClosing event

    private void MainForm_FormClosing(object sender, FormClosingEventArgs e){

        if (!mailsent)
        {
            MessageBox.Show("Please wait, Mail Sending in Process !!! ");
            e.Cancel = true;
        }
    }

Hope it helps !!

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