文件被什么东西阻止了？

Question

我被困在这个例外。我不确定，我的代码的哪一部分可能会阻止 xml 文件。

这是main.cs:

 foreach (var po_no in DatabaseData.getPO_NOs())
            {
                XmlFile.serialize(DatabaseData.read(po_no));
            }

            foreach (var fileToSend in new DirectoryInfo(AppD_Config.getConfigKey("toSendFolder")).GetFiles())
            {
                Mail.Mail.send("xxxx", "xxxx", fileToSend.FullName.Split('\').Last(), " ", fileToSend.FullName);
                Debug.WriteLine("Sent mail.");
                fileToSend.MoveTo(fileToSend.FullName.Replace(AppD_Config.getConfigKey("toSendFolder"), AppD_Config.getConfigKey("sentFolder")));
//EXCEPTION OCCURS RIGHT UP THIS COMMENT------------------
                }

XmlFile.serialize-

public static string serialize(Order order)
        {
            Directory.CreateDirectory(AppD_Config.getConfigKey("toSendFolder"));
            string fullPath = AppD_Config.getConfigKey("toSendFolder") + order.PO_NO + @"_epce_PO.xml";
            XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
            ns.Add("structure", "ORDERS");
            ns.Add("orders_structure_ver", "1");
            var serializer = new XmlSerializer(order.GetType());
            using (TextWriter writer = new StreamWriter(fullPath))
            {
                serializer.Serialize(writer, order, ns);
                writer.Close();
                return fullPath;
            }
        }

Mail.Send-

public static void send(string from, string to, string subject, string message, string attachmentPath)
        {
            MailMessage mail = new MailMessage(from, to);
            SmtpClient client = new SmtpClient();
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.UseDefaultCredentials = false;
            client.Host = "smtpexch";
            client.Port = 25;

            mail.Attachments.Add(new Attachment(attachmentPath));
            mail.Subject = subject;
            mail.Body = message;
            client.Send(mail);
        }

老实说，我找不到，是什么导致了文件块。这应该是所有代码，必须对文件执行某些操作。

其他一切都只是不触及代码。如果您觉得任何方法令人不安，我可以添加任何其他内容。

提前致谢。

EDIT_THE 异常

An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll

Additional information: The process cannot access the file because it is being used by another process.

Answer 1

我认为您没有适当地处理资源。试试这个：

using (SmtpClient client = new SmtpClient())
{
    using (MailMessage mail = new MailMessage(from, to))
    {
        client.DeliveryMethod = SmtpDeliveryMethod.Network;
        client.UseDefaultCredentials = false;
        client.Host = "smtpexch";
        client.Port = 25;

        using (var attachment = new Attachment(attachmentPath))
        {
            mail.Attachments.Add(attachment);
            mail.Subject = subject;
            mail.Body = message;
            client.Send(mail);
        }                        
    }                    
}

所有正在使用的类都实现了 IDisposable 接口。我相信你已经找到了困难的原因。 :-)

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