How to Add an Attribute to Node in C#

Create XML files in C#.

Knowing how to add an attribute to an element node in Microsoft Visual C# can make your XML application more user-friendly. C# is an object-oriented programming language used to develop web, mobile and desktop applications. Extensible Markup Language (XML) is basically a set of rules to encode documents to easily be shared with other programming languages. System.XML is a namespace that provides a set of classes in C# to write or edit XML data while it's in memory.

Things You'll Need

• Microsoft Visual C# Express

Instructions

1. Start Microsoft Visual C# Express and click "New Project..." on the left pane of your screen. Double-click "Windows Console Application."

2. Press "Ctrl" + "A" and press "Delete" to delete existing code. Copy and paste the following code to your "Program.cs" module to add a new attribute to a node:

   using System;

   using System.IO;

   using System.Xml;

   using System.Collections.Generic;

   using System.Linq;

   using System.Text;

   namespace ConsoleApplication1

   {

   class Program

   {

   static void Main(string[] args)

   {

   XmlDocument myXMLDoc = new XmlDocument();

   myXMLDoc.LoadXml("<book xmlns:bk='urn:samples' bk:ISBN='1-51111-57-5'>" +

   "<title>Add Attribute to Node</title>" +

   "</book>");

   XmlElement myRoot = myXMLDoc.DocumentElement;

   // Add a new attribute.

   myRoot.SetAttribute("genre", "urn:samples", "Education");

   Console.WriteLine("Modified XML:");

   Console.WriteLine(myXMLDoc.InnerXml);

   }

   }

   }

3. Press "F5" to run your program. The output will look like the following:

   "Modified XML:

   <book xmlns:bk="urn:samples" bk: ISBN="1-51111-57-5" bk:genre="Education"><title> Add Attribute to Node</title></book>"

References

• Microsoft: Creating New Attributes for Elements
• Microsoft: XML Documents