覆盖现有的XML文件(如果已存在) [英] Overwrite existing XML file if it alreadly exists

问题描述

我正在尝试覆盖现有的xml文件(如果已经存在).

I am trying to overwrite an existing xml file if it already exists.

我正在使用下面的代码检查文件是否存在，然后将其覆盖.现有文件是隐藏的，因此在尝试覆盖之前我将其取消隐藏.

I am using the code below to check if the file exists and then overwrite it if it does. The existing file is hidden so I am unhiding it before attempting to overwrite.

文件未发生更改，但是覆盖不起作用.

The changes are not occuring to the file and the overwriting is not working however.

这是我在下面使用的代码减去编写新xml数据的部分.

Here is the code I am using below minus the part where I am writing the new xml data.

if(File.Exists(filePath))
{
     File.SetAttributes(filePath,FileAttributes.Normal);
     FileIOPermission filePermission = 
              new FileIOPermission(FileIOPermissionAccess.AllAccess,filePath);

     FileStream fs = new FileStream(filePath, FileMode.Create);

     XmlWriter w = XmlWriter.Create(fs);
 }

推荐答案

尝试以这种方式写入文件:

Try writing to the file like this :

if(File.Exists(filePath))
{
     File.SetAttributes(filePath,FileAttributes.Normal);
     FileIOPermission filePermission = 
              new FileIOPermission(FileIOPermissionAccess.AllAccess,filePath);

     using(FileStream fs = new FileStream(filePath, FileMode.Create))
     {
         using (XmlWriter w = XmlWriter.Create(fs))
         {
             w.WriteStartElement("book");
             w.WriteElementString("price", "19.95");
             w.WriteEndElement();
             w.Flush();
         }
     }     
 }

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