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Editorial Team
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Asked: 2026-06-06T20:15:18+00:00

string XML1 = <Root><InsertHere></InsertHere></Root>; string XML2 = <Root><child1><childnodes>data</childnodes><childnodes>data1</childnodes></child1><child2><childnodes>data</childnodes><childnodes>data1</childnodes></child2></Root>; Among below mentioned two code samples..

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        string XML1 = "<Root><InsertHere></InsertHere></Root>";
        string XML2 = "<Root><child1><childnodes>data</childnodes><childnodes>data1</childnodes></child1><child2><childnodes>data</childnodes><childnodes>data1</childnodes></child2></Root>";

Among below mentioned two code samples.. usage of childNodes doesn’t copy all the child nodes from XML2. only <child1> is being copied.

        string strXpath = "/Root/InsertHere";

        XmlDocument xdxmlChildDoc = new XmlDocument();
        XmlDocument ParentDoc = new XmlDocument();
        ParentDoc.LoadXml(XML1);
        xdxmlChildDoc.LoadXml(XML2);

        XmlNode xnNewNode = ParentDoc.ImportNode(xdxmlChildDoc.DocumentElement.SelectSingleNode("/Root"), true);

        if (xnNewNode != null)
        {
            XmlNodeList xnChildNodes = xnNewNode.SelectNodes("/*");
            if (xnChildNodes != null)
            {
                foreach (XmlNode xnNode in xnChildNodes)
                {
                    if (xnNode != null)
                    {
                        ParentDoc.DocumentElement.SelectSingleNode(strXpath).AppendChild(xnNode);
                    }
                }
            }
        }

code2:

    if (xnNewNode != null)
    {
        XmlNodeList xnChildNodes = xnNewNode.ChildNodes;
        if (xnChildNodes != null)
        {
            foreach (XmlNode xnNode in xnChildNodes)
            {
                if (xnNode != null)
                {
                    ParentDoc.DocumentElement.SelectSingleNode(strXpath).AppendChild(xnNode);
                }
            }
        }
    }

ParentDoc.OuterXML after executing first sample of code:

<Root>
    <InsertHere>
        <child1>
            <childnodes>data</childnodes>
            <childnodes>data1</childnodes>
        </child1>
        <child2>
            <childnodes>data</childnodes>
            <childnodes>data1</childnodes>
        </child2>
    </InsertHere>
</Root>

ParentDoc.OuterXML after executing second sample of Code

<Root>
    <InsertHere>
        <child1>
            <childnodes>data</childnodes>
            <childnodes>data1</childnodes>
        </child1>
    </InsertHere>
</Root>
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1 Answer

  1. Editorial Team

    this is a clearing of what Anders G posted, with more through explanation.

    I am surprised the foreach does not fail (Throw Exception) in this situation, but hell.

    In code1.
    1. Create a NEW COLLECTION of nodes
    2. Select nodes to it
    3. append to other node => removing from original collection, but not the newly created one.
    4 you are removing the node you are adding from the newly collection.

    in Code2
    1. Reference the ORIGINAL node collection
    {child1, child2}
    2. append 1st Node away to another collection => removing it from the original collection
    {child2}
    3. now when the foreach at index 1, it see that it passed the end of the collection. and exit.

    this happens a lot when changing a collection that is subject to iteration.
    but most the time, the IEnumerator is throwing an Exception when such happens.

    hope i made it all clear

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