C# 无法删除文件，因为它是'；正在被另一个进程使用

当我试图删除“foreach”循环中的文件时，我在最后收到了错误消息

我知道我需要在某处使用关键字“using”，但我不确定在哪里以及如何使用

private void btnEmailIntegrationFiles_Click(object sender, EventArgs e)
{
    DialogResult EmailWarningMsg = MessageBox.Show("You're about to email the Integration IAT text files. Are you sure?", "WARNING!", MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2);

    if (EmailWarningMsg == DialogResult.Yes)
    {
        if (Directory.GetFiles(AppVars.NetworkIntegrationFileLocation).Length == 0)
        {
            MessageBox.Show("The folder is empty. Please create the files before sending it.", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        else
        {
            if (Directory.GetFiles(AppVars.NetworkIntegrationFileLocation).Length != 4)
            {
                MessageBox.Show("The folder does not contain exactly 4 files.", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
                Email email = new Email();

                email.SendEmailToFinalDestinationWithAttachments(AppVars.DBTeamEmail, AppVars.ChrisWhitmoreEmail, AppVars.DBTeamEmail, "Integration Files", "Please see integration files attached.");
            }
        }

        PopulateListViewWithPoliciesAvailableToHoldBack();

        string[] files = Directory.GetFiles(AppVars.NetworkIntegrationFileLocation);

        foreach (string file in files)
        {
            File.Delete(file);
        }
    }
}

我如何使用关键字

使用
发送“电子邮件”，以便在尝试删除作为附件发送的文件时不会遇到此错误消息

以下是发送电子邮件类：

public void SendEmailToFinalDestinationWithAttachments(string EmailFrom, string EmailTo, string EmailCC, string EmailSubject, string EmailBody)
        {
            try
            {
                MailMessage EmailMessage = new MailMessage();
                SmtpClient smtp = new SmtpClient(AppVars.SMTPClient, AppVars.SMTPClientPort);
                smtp.UseDefaultCredentials = false;
                EmailMessage.IsBodyHtml = true;
                EmailMessage.To.Add(EmailTo);
                EmailMessage.CC.Add(EmailCC);
                EmailMessage.CC.Add(user);
                EmailMessage.Subject = EmailSubject;
                EmailMessage.From = new MailAddress(EmailFrom);
                EmailMessage.Body = EmailBody;

                string[] files = Directory.GetFiles(AppVars.NetworkIntegrationFileLocation, "*" + DateTime.Now.ToString("yyyyMMdd") + "*");

                foreach (string file in files)
                {
                    EmailMessage.Attachments.Add(new Attachment(file));
                }

                smtp.Send(EmailMessage);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }
        }

您需要修改电子邮件类，使其类似于：

using (MailMessage EmailMessage = new MailMessage()) {
    ...
    smtp.Send(EmailMessage);
}

可能是通过电子邮件；但是，您还没有提供有关该类的任何详细信息。它是从哪里来的？SendEmailToFinalDestinationWithAttachments做什么，等等？清理代码/重构代码，并确保发布符合问题的所有必要代码。提供了email类。我很确定问题出在“string[]files=Directory.GetFiles（AppVars.NetworkIntegrationFileLocation）”+DateTime.Now.ToString（“yyyyMMdd”）+”；foreach（文件中的字符串文件）{EmailMessage.Attachments.Add（新附件（文件））；}”…我该如何在这里使用关键字“using”？这不是你问题的原因，但你到底为什么一直重复目录读取？最后一个实际上是危险的——如果其他东西被扔在中间，它就会被盲目地杀死。你说得对。我应该只删除应该在那里出现的文件。。。虽然该文件夹中不应该有其他内容。。。