c# - 创建后删除文件

Question

我想在创建文件后删除它，但根本做不到。错误消息是它仍在被进程使用。我正在开发一个 winform 应用程序。

这是我的代码:

XmlDocument xmlDoc = new XmlDocument();
XmlDeclaration xmlDec = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
xmlDoc.AppendChild(xmlDec);

XmlElement elmRoot = xmlDoc.CreateElement("testConfig");
xmlDoc.AppendChild(elmRoot);

GetConfigTags(xmlDoc, elmRoot, clientToken);

StreamWriter wText = 
    new StreamWriter(CommonCodeClass.configLocation + "EmailConfig.xml");
xmlDoc.Save(wText);
wText.Flush();
wText.Close();
wText.Dispose();
File.Delete(CommonCodeClass.configLocation + "EmailConfig.xml");

我也试过下面的代码，但同样的错误，另一个进程正在使用文件

try
{
    File.Delete(CommonCodeClass.configLocation + "EmailConfig.xml");
}
catch  //or maybe in finally
{
    GC.Collect(); //kill object that keep the file. I think dispose will do the trick as well.
    Thread.Sleep(500); //Wait for object to be killed. 
    File.Delete(CommonCodeClass.configLocation + "EmailConfig.xml"); //File can be now deleted
    log.Error(CommonCodeClass.configLocation + "EmailConfig.xml" + " was deleted forcefully as it was being used by the process.");

}

我是否遗漏了文件的任何地方？

请帮忙。谢谢。

这里是 getconfigtag 的代码:它只是创建一个要在配置文件中应用的标签。

 internal static void GetConfigTags(XmlDocument xmlDoc, XmlElement elmRoot, string clientToken)
    {
        // Username Element            
        XmlElement elmUsername = xmlDoc.CreateElement(CommonCodeClass.xml_Username);
        XmlAttribute xaUsername = xmlDoc.CreateAttribute("val");
        xaUsername.Value = "singleVal";
        elmUsername.InnerXml = "";
        elmUsername.Attributes.Append(xaUsername);
        elmRoot.AppendChild(elmUsername);
     }

堆栈跟踪:

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.File.Delete(String path) at ShareMgmt.CommonCodeClass.EmailTheConfigFile(String userEmail, String clientToken) in C:\Users\ddsds\Documents\Visual Studio 2008\Projects\ShareMgmt\Mgmt\CommonCodeClass.cs:line 756 at ShareMgmt.UsersForm.btnConfigToAdmin_Click(Object sender, EventArgs e) in C:\Users\ddsds\Documents\Visual Studio 2008\Projects\ShareMgmt\Mgmt\UsersForm.cs:line 1122

Answer 1

“我是不是遗漏了一个文件的结尾？”您可以确定使用“using”语句关闭文件。

    XmlDocument xmlDoc = new XmlDocument();
    XmlDeclaration xmlDec = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
    xmlDoc.AppendChild(xmlDec);

    XmlElement elmRoot = xmlDoc.CreateElement("testConfig");
    xmlDoc.AppendChild(elmRoot);

    GetConfigTags(xmlDoc, elmRoot, clientToken);

    using (StreamWriter wText = new StreamWriter(CommonCodeClass.configLocation + "EmailConfig.xml"))
    {
            xmlDoc.Save(wText);
            wText.Flush();
    }

    File.Delete(CommonCodeClass.configLocation + "EmailConfig.xml");

此代码适用于我，但您的原始代码的变体也适用，因此除此之外，我不太确定问题出在哪里。

附录:

根据您的堆栈跟踪，您似乎正在尝试通过电子邮件发送 XML 文件。如果是这种情况，并且您正在使用 SmtpClient，您甚至不需要将 XML 文档写入文件。

MemoryStream memoryStream = new MemoryStream();
xmlDoc.Save(memoryStream);

// ...

mailMessage.Attachments.Add(
    new Attachment(memoryStream, "EmailConfig.xml", "application/xml"));