How to change a value of element or node in XML file

Question

Hi all, I have question that I have a xml file, I add it to my Project C# Win Form, Now I want to change a value of 1 node or element, so what I need to do? Please give a guide or link or example project to me reference, thank very much. Here is demo file xml and picture demo. Collapse | Copy Code 1111 English 2$ 222 USA 3$ 3333 Singapore 4$ http://i1055.photobucket.com/albums/s505/vn_photo/222.jpg

Maria Bili · Answer

cherr It very helpfull, I will success. Thank very much.

Vulpes · Answer

That's right. The code for the button Click eventhandler will be something like this: using System.Linq; using System.Xml.Linq; //... private void btnChange_Click(object sender, EventArgs e) { if (textBox1.Text.Length == 0 { MessageBox.Show("A node/element ID is needed to make the change"); textBox1.Focus(); return; } XElement data = XElement.Load("demo.xml"); XElement searchBook = data.Elements("book").Where(book => book.Element("bookID").Value == textBox1.Text).FirstOrDefault(); if(searchBook != null) { searchBook.Element("bookName").Value = textBox3.Text; // insert new value data.Save("demo.xml"); } else { MessageBox.Show("A node with that ID was not found"); } }

Maria Bili · Answer

Thank for help. Update my picture demo: http://i1055.photobucket.com/albums/s505/vn_photo/222.jpg In this I think we a get value from textbox node/element value and transmit it to bookID and after that fill new value of bookName and change ? some one have some opinon ?

Vulpes · Answer

Suppose you want to look for the book node with a bookID of 1111 and change the bookPrice from 2$ to 1$. This LINQ to XML code should do it: using System; using System.Linq; using System.Xml.Linq; class Test { static void Main() { XElement data = XElement.Load("demo.xml"); XElement searchBook = data.Elements("book").Where(book => book.Element("bookID").Value == "1111").FirstOrDefault(); if(searchBook != null) { searchBook.Element("bookPrice").Value = "1$"; data.Save("demo.xml"); } } }