CODEWITHSUNDEEP
c#xmlxmldocument
BOSS
BOSS

Reputation: 1898

C# : Modify a xml node

i have that xml file :

<?xml version="1.0" encoding="utf-8"?>
<reminders>
  <reminder>
    <Title>Alarm1</Title>
    <Description>Desc1</Description>
    <Time>03/07/2012 10:11AM</Time>
    <snooze>1</snooze>
    <repeat>None</repeat>
  </reminder>
</reminders>

And i want to modify the innertext from Alarm1 to another value so i wrote that code which actually duplicate the entire node .

        XmlDocument xml = new XmlDocument();

        xml.Load("0.xml");

        XmlNodeList elements = xml.SelectNodes("//reminders");

        foreach (XmlNode element in elements)
        {
            if (element.InnerText == "Alarm1")
            {
                XmlNode newvalue = xml.CreateElement("MODIFIED");
                element.ReplaceChild(newvalue, element);

                xml.Save("0.xml");
            }
        }

And then tried another code :

        foreach (XmlElement element in xml.SelectNodes("//reminder"))
        {
            if (element.InnerText == "Alarm1")
            {
                XmlNode newvalue = xml.CreateElement("MODIFIED");
                element.ReplaceChild(newvalue, element);

                xml.Save("0.xml");
            }
        }

But also doesn`t work....

EDIT 1 : [Figured out a new code]

        XmlDocument xml = new XmlDocument();

        xml.Load("0.xml");

        foreach (XmlElement element in xml.SelectNodes("//reminder"))
        {
            foreach (XmlElement element1 in element)
            {
                if (element.SelectSingleNode("//Title").InnerText == "Alarm1")
                {
                    XmlNode newvalue = xml.CreateElement("MODIFIED");
                    element.ReplaceChild(newvalue, element1);

                    xml.Save("0.xml");
                }
            }
        }

But it made the Alarm1 becomes

<MODIFIED />

EDIT 2 : [I SOLVED IT :D] Okay here is the code i could figure out :

        XmlDocument xml = new XmlDocument();

        xml.Load("0.xml");

        foreach (XmlElement element in xml.SelectNodes("//reminder"))
        {
            foreach (XmlElement element1 in element)
            {
                if (element.SelectSingleNode("//Title").InnerText == "Alarm1")
                {
                    MessageBox.Show(element1.InnerText);
                    XmlNode newvalue = xml.CreateElement("Title");
                    newvalue.InnerText = "MODIFIED";
                    element.ReplaceChild(newvalue, element1);

                    xml.Save("0.xml");
                }
            }
        }

I`ll really appreciate your helps and thanks.

Upvotes: 17

Views: 75566

Answers (5)

Bharat
Bharat

Reputation: 6095

XmlDocument xml = new XmlDocument();
xml.Load(...);

var newTitle = "MODIFIED";
var title_node = xml.GetElementsByTagName("Title");
if(!string.IsNullOrEmpty(newTitle) && title_node.Count > 0)
{
    title_node[0].InnerText = newTitle;
}

Upvotes: 0

Jodrell
Jodrell

Reputation: 35746

If you want to use linq with xml (I find it the best way) then you will want to use the System.Xml.Linq namespace. The classes in that namespace are all prefixed with just X not Xml. The functionality in this namespace is newer, better and much easier to manipulate with Linq.

var xml = XDocument.Load("0.xml");
var alarm1 = xml.Descendants("reminder")
                .Single(r => r.Element("Title") == "Alarm1");

This code will give you a variable, alarm1 that is the reminder that has a title node of "Alarm1."

From that point its not clear to me exactly what you want to modify. If you just want to change the title then ...

alarm1.Element("Title").Value = "MODIFIED";
xml.Save("0.xml");

Upvotes: 4

aaroncatlin
aaroncatlin

Reputation: 3281

Try this:

xml.SelectSingleNode("//reminder/Title").InnerText = "NewValue";

Your foreach line is simply looping through a list of elements called "reminders", not it's child nodes.

Take a look at this xpath tutorial for more information:

http://www.w3schools.com/xpath/xpath_intro.asp

Upvotes: 20

L.B
L.B

Reputation: 116188

XDocument xDoc = XDocument.Load(.....);
xDoc.Descendants("Title").First().Value = "New Value";
xDoc.Save(...)

Upvotes: 2

Julien
Julien

Reputation: 3537

XDocument doc = XDocument.Load("0.xml");
IEnumerable<XElement> rech =
                     from el in doc.Root.Elements("reminder")
                     where (string)el.Element("Title") == "Alarm1"
                     select el;
if (rech.Count() != 0)
{
   foreach (XElement el in rech)
   {
       el.Element("Title").SetValue("NEW TITLE");
   }
}
doc.Save("0.xml");

Upvotes: 2

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