Question

我创建了一个电子邮件应用，它向数据库中的所有用户发送电子邮件，但是我遇到了问题，如果用户的电子邮件无效，请尝试catch显示异常并停止向其他人发送信件。继承我的尝试捕获代码

try
{
    foreach (string item in risto)
    {
        AlternateView avHtml = AlternateView.CreateAlternateViewFromString(htmlBody, null, MediaTypeNames.Text.Html);

        MailMessage mail = new MailMessage(txtBEmail.Text, item, txtBTema.Text, rtxtBContent.Text);
        mail.AlternateViews.Add(avHtml);
        // SmtpServer = smtp.company.com; Ex: Gmail - smtp.gmail.com | Yahoo - smtp.yahoo.com
        SmtpClient client = new SmtpClient("mail.mailExample.com");
        client.Port = 587;


        client.Credentials = new System.Net.NetworkCredential(txtBEmail.Text, txtBPass.Text);
        client.EnableSsl = false;
        client.Send(mail);
        progressBar1.Visible = true;
        progressBar1.Increment(1);
    }

    MessageBox.Show("Sent", MessageBoxButtons.OK);
    txtBEmail.Text = "";
    txtBPass.Text = "";
    txtBTema.Text = "";
    txtBPic.Text = "";
    txtBLink.Text = "";
    rtxtBContent.Text = "";
}
catch (Exception ex)
{
    MessageBox.Show("Bad data" + ex);
    txtBEmail.Text = "";
    txtBPass.Text = "";
    txtBTema.Text = "";
    txtBPic.Text = "";
    txtBLink.Text = "";
    rtxtBContent.Text = "";
}

Answer 1

每封电子邮件都需要单独的try / catch：

foreach (var mail in emails)
{
    bool emailSent;
    // Prepare single email here

    try
    {
        // Try do send it here
        // ....
        client.Send(mail);
        // If the code comes here, it means the mail was sent
        emailSent = true;
    }
    catch 
    {
        // log the exception
    }

    Debug.WriteLine($"Email to {mail} status: {emailSent}");
}

Answer 2

整个循环周围有try / catch构造。这意味着一旦一条消息失败，控制就会移动到catch块并且循环停止。

您需要将try / catch 放在循环中以捕获每个可能的异常并且能够继续循环下一个项目。

c＃即使捕获异常也继续尝试代码

2 个答案: