How to overwrite data in a xml file?

franky

Hi boys and girls!

I have an xml file that looks for example like this:

-
-
-
-
Nombre1
Nombre2
Nombre3

-
Lat1
Lat2
Lat3

-
Long1
Long2
Long3

Then, my program do some stuff and has a new value to put for example in the place where is "Long1".
How can I overwrite that value in the xml file without to write the
whole xml again?
If is not posible tell me the best way to perform that task

Thanks in advance and if it has been posted before please refer me to that post because i haven't found it.

3 Replies

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csharphelp21y ago
try this code
XmlDocument doc = new XmlDocument();
     doc.Load(docPath);
     foreach (XmlNode node in doc.SelectNodes("//path"))
     {
      node.InnerText = this.TxtPath.Text;
     }
     doc.Save(docPath);
Jonathan Mitchem21y ago
csharp, Unfortunately you're right. Not a big deal to use memory if the XML files are manageable. 100+MB XML files, or several megabyte XML files using .NET CF... those get much uglier. I'm working on that problem, actually... basically a Random Access XML class library... DOM that manipulates the file directly. Jonathan
Stan Gershengoren21y ago
Short answer: you cannot access the file in a random place, change something, and close it.

What I would suggest is using XmlDocument object

use Load method to load the entire file, use SelectSingleNode to find the node, and use Save method
to write the file back to the file system.

Hope that helps