[2.0] Deleting a node from XML

**drattansingh** · Jul 9th, 2007, 11:53 AM

Hi all:

I'm trying to do some manipulation with an xml file. What I'm doing is trying to store and manipulate a small amount of data, but not with a database but an XML file. So the following xml file simply saves settings each with a name, head and tail value. For each new setting, there is another setting node inserted.

Code:

<?xml version="1.0"?>
<PDFBUILDER>
  <RENAMESETTINGS>
    <SETTING>
      <NAME Type="Name">TEST</NAME>
      <HEAD Type="Head">df</HEAD>
      <TAIL Type="Tail">def</TAIL>
    </SETTING>
    <SETTING>
      <NAME Type="Name">2TEST</NAME>
      <HEAD Type="Head">esser</HEAD>
      <TAIL Type="Tail">deesr</TAIL>
    </SETTING>
    <SETTING>
      <NAME Type="Name">bbdos</NAME>
      <HEAD Type="Head">ewr</HEAD>
      <TAIL Type="Tail" />
	</SETTING>
  </RENAMESETTINGS>
</PDFBUILDER>

The problem comes in when I want to user to delete a node / setting. Say for e.g., if the user wanted to delete the setting named: 2TEST, is there anyway to read in the xml from the file, and delete the node:

<SETTING>
<NAME Type="Name">2TEST</NAME>
<HEAD Type="Head">esser</HEAD>
<TAIL Type="Tail">deesr</TAIL>
</SETTING>

And then write back the result to the file? Thus what I want to write back to the file will be:

<?xml version="1.0"?>
<PDFBUILDER>
<RENAMESETTINGS>
<SETTING>
<NAME Type="Name">TEST</NAME>
<HEAD Type="Head">df</HEAD>
<TAIL Type="Tail">def</TAIL>
</SETTING>
<SETTING>
<NAME Type="Name">bbdos</NAME>
<HEAD Type="Head">ewr</HEAD>
<TAIL Type="Tail" />
</SETTING>
</RENAMESETTINGS>
</PDFBUILDER>

Now I know how to write to xml files etc. what I don't know is how to extract and delete a node for e.g. 2TEST.

Could anyone help me with this?

Jennifer.

**nmadd** · Jul 9th, 2007, 12:56 PM

First my disclaimer that I'm just learning about XML myself, so take this with a grain of salt.

There may be a better way but this seems to work:

c# Code:

// XML
        private void button1_Click(object sender, EventArgs e)
        {  
            XmlDocument d = new XmlDocument();
            d.Load(@"c:\XMLFile1.xml");
            XmlNodeList nodList = d.SelectNodes("PDFBUILDER/RENAMESETTINGS/SETTING/NAME[@Type='Name']");
            foreach (XmlNode nod in nodList)
            {
                if (nod.InnerXml.Equals("2TEST"))
                    nod.ParentNode.ParentNode.RemoveChild(nod.ParentNode);
            }
            d.Save(@"c:\XMLFile1.xml");
        }

Good luck.

**drattansingh** · Jul 10th, 2007, 02:27 PM

Hey thanks! I tried it and it worked fine. Just one question, I solved my problem but is there a way to insert a node similar to the way you gave to me?

Jennifer.

**nmadd** · Jul 10th, 2007, 02:46 PM

Hi Jennifer,
I can't say that I've tried that out yet, but perhaps this link will help: http://www.developerfusion.co.uk/show/3227/

Good luck.

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