如何更改具有相同名称的多个子节点的值 [英] How to change the value of multiple child nodes with same name

问题描述

大家好，



我有一个要求，我必须将每个具有相同名称的子节点的值更新为null（）。数据类型为XElement（XML）。下面是我到目前为止尝试的代码段。

  if （xmlData.Elements（  attachment）。Any（））{
  foreach （XElement节点 in  xmlData.Elements（  attachment） ））
 {
  if （nodes.Value！=  ）{
 xmlData.SetElementValue（nodes.Name， ）; 
} 
} 
} 
  if （xmlData.Elements（   comment）。Any（）&& xmlData.Elements（  comment）。元素（  comment_attachment） .Any（））{
  foreach （XElement节点 in  xmlData.Elements（  comment）。元素（  comment_attachment））{
  if （nodes.Value！=  ）{
 xmlData.SetElementValue（nodes.Name， ）; 
} 
} 
} 

这里xmlData是包含巨大XML父级的XElement对象节点。在这个节点内，我必须清除节点 attachment 和 comment_attachment 的内容，这些节点本质上是编码为二进制数据并以XML格式存储的文件。



我试图使用SetElementValue方法，该方法仅将第一个子值设置为null，但不是所有子项（attachment或comment_attachment节点）。



还有其他替代品吗？



提前致谢。

解决方案

试试 RemoveNodes 方法 [ ^ ]：

  foreach （XElement node  in  xmlData.Elements（  attachment））
 {
 node.RemoveNodes（）; 
} 
  foreach （XElement节点 in  xmlData.Elements（  comment）。元素（  comment_attachment））
 {
 node.RemoveNodes（）; 
} 

如果您想清除属性，请使用 RemoveAll 方法 [ ^ ]。



注意：此代码只能找到< attachment> 和< comment> 元素，它们是 xmlData 节点的直接子元素。

关于OP的评论...



看看例子：

 < span class =code-comment> //   create sample xml（input） 
  string  xcontent =  @ < Boards> 
< Board class ='support'appid = '1'> 
< Notes> 
 < Note class ='message'id ='1'source ='client'>早上好！当我尝试将大部分文本复制到剪贴板时，我的应用程序挂起。< / Note> 
< Note class ='message'id ='2'source ='stuff'>早上好！< / Note> 
< Note class ='question'id ='3'source ='stuff'>您是否尝试复制较少部分的文字？< / Note> 
< Note class ='message'id ='4'source ='client'>等一下。我会试试。< / Note> 
< Note class ='message'id ='5'source ='client'>抱歉，仍有相同的错误。< / Note> 
< Note class ='message'id ='6'source ='stuff'>谢谢！好像，这是一个错误。我会向开发者报告。< / Note> 
< Note class ='question'id ='7'source ='stuff'>您还有其他问题吗？< / Note> 
< Note class ='message'id ='8'source ='client'>不。谢谢。< / Note> 
< Note class ='message'id ='9'source ='stuff'>谢谢。很快，您将获得有关更新的信息。< / Note> 
< / Notes> 
< / Board> 
< / Boards>; 
 XDocument xdoc = XDocument.Parse（xcontent）; 
 
  //  获取具有特定属性的节点;  
  var  nodesToClean = xdoc.Descendants（ 注意）。其中（x => x.Attribute（  class）。值==  问题）; 
 
  //  用空字符串替换值 
  foreach （XElement xele  in  nodesToClean）
 {
 xele.Value =  string  .Empty; 
} 
 
  //  文档已更改!!!  

结果：

< Boards >
< Board class = support appid = 1 >
< 注释 >
< 注意 class = 消息 id = 1 source = client > 早上好！当我尝试将大部分文本复制到剪贴板时，我的应用程序挂起。< / Note >
< 注意 < span class =code-attribute> class = message id = 2 source = stuff > 早上好！< / Note >
< 注意 class = 问题 id = 3 source = stuff > < /注意 > ;
< 注意 class = message id = 4 source = client > 等一下。我会试试。< / Note >
< 注意 class = message < span class =code-attribute> id = 5 source = 客户端 > 抱歉，仍然是同样的错误。< / Note >
< 注意 class = message id = 6 source = stuff > 谢谢！好像，这是一个错误。我将向开发人员报告。< / Note >
< 注意 class = 问题 id = 7 source = stuff > < / Note >
< 注意 class = message id = 8 source = client > 否。谢谢。< /注意 >
< 注意 class = message id = 9 source = stuff > 谢谢。很快，您将获得有关更新的信息。< / Note >
< / Notes >
< / Board >
< / Boards >

Hi All,

I have a requirement wherein I have to update the values of each child nodes with the same name to null (""). The data is of type XElement (XML). Below is the snippet i tried so far.

if (xmlData.Elements("attachment").Any()) {
                    foreach (XElement nodes in xmlData.Elements("attachment"))
                    {
                        if (nodes.Value != "") {
                            xmlData.SetElementValue(nodes.Name, "");
                        }
                    }
                }
                if (xmlData.Elements("comment").Any() && xmlData.Elements("comment").Elements("comment_attachment").Any()) {
                    foreach (XElement nodes in xmlData.Elements("comment").Elements("comment_attachment")) {
                        if (nodes.Value != "") {
                            xmlData.SetElementValue(nodes.Name, "");
                        }
                    }
                }

Here the xmlData is the XElement object containing a huge XML parent node. Inside this node I have to clear the contents of the nodes attachment and comment_attachment, which are essentially files encoded as binary data and stored in XML.

I tried to use the SetElementValue method which sets only the first child value to null, but not for all the children (attachment or comment_attachment nodes).

Are there any other alternatives for this?

Thanks in advance.

解决方案

Try the RemoveNodes method[^]:

foreach (XElement node in xmlData.Elements("attachment"))
{
    node.RemoveNodes();
}
foreach (XElement node in xmlData.Elements("comment").Elements("comment_attachment"))
{
    node.RemoveNodes();
}

If you want to clear the attributes as well, use the RemoveAll method[^].

NB: This code will only find <attachment> and <comment> elements which are direct children of the xmlData node.

As to the OP's comments...

Have a look at example:

//create sample xml (input)
string xcontent = @"<Boards>
    <Board class='support' appid='1'>
        <Notes>
            <Note class='message' id='1' source='client'>Good morning! My application hangs when i try to copy large portion of text to the clipboard.</Note>
            <Note class='message' id='2' source='stuff'>Good morning!</Note>
            <Note class='question' id='3' source='stuff'>Have you tried to copy less portion of text?</Note>
            <Note class='message' id='4' source='client'>Wait a moment. I'll try.</Note>
            <Note class='message' id='5' source='client'>Sorry, still the same error.</Note>
            <Note class='message' id='6' source='stuff'>Thank you! Seems, it's a bug. I'll report it to the developer.</Note>
            <Note class='question' id='7' source='stuff'>Do you have another question?</Note>
            <Note class='message' id='8' source='client'>No. Thank you.</Note>
            <Note class='message' id='9' source='stuff'>Thank you. Soon you'll get information about an update.</Note>
        </Notes>
    </Board>
</Boards>";
XDocument xdoc = XDocument.Parse(xcontent);

//get nodes with specific attribute;
var nodesToClean = xdoc.Descendants("Note").Where(x=>x.Attribute("class").Value=="question");

//replace value with empty string
foreach (XElement xele in nodesToClean)
{
    xele.Value = string.Empty;
}

//document has been changed!!!

Result:

<Boards>
  <Board class="support" appid="1">
    <Notes>
      <Note class="message" id="1" source="client">Good morning! My application hangs when i try to copy large portion of text to the clipboard.</Note>
      <Note class="message" id="2" source="stuff">Good morning!</Note>
      <Note class="question" id="3" source="stuff"></Note>
      <Note class="message" id="4" source="client">Wait a moment. I'll try.</Note>
      <Note class="message" id="5" source="client">Sorry, still the same error.</Note>
      <Note class="message" id="6" source="stuff">Thank you! Seems, it's a bug. I'll report it to the developer.</Note>
      <Note class="question" id="7" source="stuff"></Note>
      <Note class="message" id="8" source="client">No. Thank you.</Note>
      <Note class="message" id="9" source="stuff">Thank you. Soon you'll get information about an update.</Note>
    </Notes>
  </Board>
</Boards>

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