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How to remove an XmlNode from XmlNodeList

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耶瑟儿～
耶瑟儿～ 2020-12-06 04:09

I need to remove an XmlNode based on a condition. How to do it?

foreach (XmlNode drawNode in nodeList)
{
       //Based on a condition
       drawNode.Remove
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6条回答
  • 别跟我提以往
    2020-12-06 04:43

    You can not easily use iterators (foreach-statement) to delete your nodes. As I see it you can do the following:

    1) In your foreach-loop, save a list of all elements that should be removed. Then you loop through just those elements and remove them.

    2) Use an ordinary for-loop and keep track of which is the next element to visit after you have deleted one item.

    Edit: When using a for-loop do it the way Fredrik suggests, looping backwards.

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  • 轮回少年
    2020-12-06 04:43

    Isn't the following a little simpler:

    XmlDocument doc = new XmlDocument(); 
doc.Load(fileName); 
XmlNodeList nodes = doc.SelectNodes("some-xpath-query"); 
while (nodes.FirstChild != null) {     
    nodes.RemoveChild(nodes.FirstChild); 
} 
doc.Save(fileName);
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  • 礼貌的吻别
    2020-12-06 04:51

    If you're trying to remove a node from the XML DOM, this isn't the correct way. Because an XMLNodeList is just a list of nodes. Rather you want to remove the node from the parent node. Like this:

    XmlNode parentNode = // some value
XmlNode drawNode = // some value
parentNode.ParentNode.RemoveChild(drawNode);
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  • 耶瑟儿～
    2020-12-06 04:54

    Seems to me you're trying to just remove an entire XML Element...

    If this is your XML...

    <Xml1>
  <body>
    <Book>
      <Title name="Tom Sawyer" />
      <Author value="Mark Twain" />
    </Book>
    <Book>
      <Title name="A Tale of Two Cities" />
      <Author value="Charles Dickens" />
    </Book>
  </body>
</Xml1>

    If you wanted to delete a book, you need to grab the first <Book> node. You can do that with:

    XmlDocument doc = new XmlDocument();
doc.Load(fileName);

XmlNodeList nodes = doc.GetElementsByTagName("body");
XmlNode bodyNode = nodes[0];
XmlNode firstBook = bodyNode.ChildNodes[0];

    Once you have the "first book" node, you can delete that from the body node using:

    bodyNode.RemoveChild(firstBook);

    This will automatically affect/update the XML Document variable, so doc will now only have:

    <Xml1>
  <body>
    <Book>
      <Title name="A Tale of Two Cities" />
      <Author value="Charles Dickens" />
    </Book>
  </body>
</Xml1>

    If you want to grab and delete the whole body, you should be able to do:

    XmlNodeList xml1 = doc.GetElementsByTagName("Xml1");
XmlNode xmlNode = xml[0];
xmlNode.RemoveChild(bodyNode);

    And the doc variable will be updated to no longer contain the body element, and can then be resaved to the file system:

    doc.Save(fileName);

    Where fileName is the full path to the XML Document on your computer.

    Best of all, we aren't using doc.SelectNodes(), so we don't need to worry about using an XMLNamespaceManager.

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  • 醉酒成梦
    2020-12-06 04:58 
        XmlNodeList xnodeContact = xmldocContact.GetElementsByTagName("contact");
          foreach (ListViewItem item in listViewContacts.Items)
            {
                if (item.Checked)
                {
                    if (item.Index >= 0)
                        xnodeContact[0].ParentNode.RemoveChild(xnodeContact[0]);
                        listViewContacts.Items.Remove(item);
                    }
                }
            }
            xmldocContact.Save(appdataPath + "\\WhatAppcontactList.xml");
            Invalidate();
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  • 鱼传尺愫
    2020-12-06 04:59

    This should do the trick for you:

    for (int i = nodeList.Count - 1; i >= 0; i--)
{
    nodeList[i].ParentNode.RemoveChild(nodeList[i]);
}

    If you loop using a regular for-loop, and loop over it "backwards" you can remove items as you go.

    Update: here is a full example, including loading an xml file, locating nodes, deleting them and saving the file:

    XmlDocument doc = new XmlDocument();
doc.Load(fileName);
XmlNodeList nodes = doc.SelectNodes("some-xpath-query");
for (int i = nodes.Count - 1; i >= 0; i--)
{
    nodes[i].ParentNode.RemoveChild(nodes[i]);
}
doc.Save(fileName);
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