How can i add "sub" child to a node with attribute using system.xml

Question

i wish you a happy new year! I got following XML structure:

<?xml version="1.0" encoding="UTF-8"?>
<SW.CodeBlock ID="0">
    <SW.CompileUnit ID="1">
        <AttributeList>
            <NetworkSource>
                <FlgNet xmlns="http://www.TEST.com">
                    <Parts> </Parts>
                </FlgNet>
            </NetworkSource>
        </AttributeList>
    </SW.CompileUnit>
    <SW.CompileUnit ID="2">
        <AttributeList>
             <NetworkSource>
                 <FlgNet xmlns="http://www.TEST.COM">
                    <Parts> </Parts>
                 </FlgNet>
             </NetworkSource>
        </AttributeList>
    </SW.CompileUnit>
</SW.CodeBlock>

How can i add a Child in "Parts" from SW.CompileUnit ID = 1 and SW.CompileUnit ID = 2 etc.?

I would like to create a loop (for-loop), which creates a child in "Parts" for every "SW.CompileUnit"-Node

Could you please help me?

PS: I use VS2015, C#, not using Linq or XPath etc.

Until now I add a child like this:

XmlNode xPiece = xdoc.SelectSingleNode("//NS2:Parts",nsmgr);
xPiece.AppendChild(myXMLElement);

but it only adds a child in the first SW.CompileUnit Node (with the ID=1) ...

Thanks in advance

Answer 1

SelectSingleNode() returns only the first matched elements. To get all matched elements, you're supposed to use SelectNodes() instead :

var nodes = xdoc.SelectNodes("//NS2:Parts",nsmgr);
foreach(XmlNode node in nodes)
{
    //create new myXMLElement
    ....
    //and then append it to current <Parts>
    node.AppendChild(myXMLElement);
}

Btw, parameter of SelectNodes() and SelectSingleNode() are XPath expressions (just saying, because you wrote "I use VS2015, C#, not using Linq or XPath etc").