在查询时使用linq更新xml无法正常工作 [英] Xml updating with linq not working when quering

问题描述

我有问题，我正在尝试使用linq查询更新XML的特定部分，但是它不起作用.所以我是一个xml文件:

I have problem i'm trying to update a specific part of the XML with the linq query but it doesn't work. So i an xml file:

<?xml version="1.0" encoding="utf-8"?>
<DesignConfiguration>
  <Design name="CSF_Packages">
    <SourceFolder>C:\CSF_Packages</SourceFolder>
    <DestinationFolder>C:\Documents and Settings\xxx</DestinationFolder>
    <CopyLookups>True</CopyLookups>
    <CopyImages>False</CopyImages>
    <ImageSourceFolder>None</ImageSourceFolder>
    <ImageDesinationFolder>None</ImageDesinationFolder>
  </Design>
</DesignConfiguration>

我要选择存在Design name="somethning"的部分并获取后代，然后更新表示该部分的后代值:

I want to select the part where the part where there is Design name="somethning" and get the descendants and then update the descendants value that means this part:

    <SourceFolder>C:\CSF_Packages</SourceFolder>
    <DestinationFolder>C:\Documents and Settings\xxx</DestinationFolder>
    <CopyLookups>True</CopyLookups>
    <CopyImages>False</CopyImages>
    <ImageSourceFolder>None</ImageSourceFolder>
    <ImageDesinationFolder>None</ImageDesinationFolder>

我有此代码:

        XDocument configXml = XDocument.Load(configXMLFileName);

        var updateData = configXml.Descendants("DesignConfiguration").Elements().Where(el => el.Name == "Design" &&
            el.Attribute("name").Value.Equals("CSF_Packages")).FirstOrDefault();

        configXml.Save(configXMLFileName);

我在updateData变量中得到了空数据.当我通过QuickWatch尝试Descendat的功能时，它还会返回一个空值.当我检查configXML变量时，它包含的数据就是我的整个xml.我究竟做错了什么?

I'm getting the null data in the updateData varibale. When I'm trying the Descendat's function through QuickWatch it also returns a null value. When I'm checking the configXML variable it has data that is my whole xml. What am I doing wrong?

推荐答案

由于DesignConfiguration是您的根节点，因此Descendants("DesignConfiguration)返回null.通过使用.Descendants(" Design)，您正在查看子项节点，而不是自身.

Because DesignConfiguration was your root node, the Descendants("DesignConfiguration) was returning null. By using the .Descendants("Design"), you were looking at child nodes, not the self.

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