Recursive search for first matching XML node, returning attribute - CSharp System.Xml

CSharp examples for System.Xml:XML Attribute

  1. HOME
  2. CSharp
  3. System.Xml
  4. XML Attribute

Description

Recursive search for first matching XML node, returning attribute

Demo Code


using System.Xml;
using System;/*  ww w  .j  av  a2 s  . c  om*/

public class Main{
        /// <summary>
        /// Recursive search for first matching node, returning attribute
        /// </summary>
        /// <param name="xmlNode"></param>
        /// <param name="nodeName"></param>
        /// <param name="attributeName"></param>
        /// <param name="searchSiblings"></param>
        /// <param name="found"></param>
        /// <returns></returns>
        public static string GetAttributeValue(XmlNode xmlNode, string nodeName, string attributeName, bool searchSiblings, out bool found)
        {
            found = false;
            if (xmlNode == null)
            {
                return "";
            }

            if (xmlNode.Name == nodeName)
            {
                var attribute = xmlNode.Attributes?[attributeName];
                //No attribute
                if (attribute == null)
                {
                    return "";
                }
                found = true;
                return attribute.Value;
            }

            //Do any of the current nodes children have the value?
            var childHasValue = GetAttributeValue(xmlNode.FirstChild, nodeName, attributeName, true, out found);
            if (found)
            {
                return childHasValue;
            }

            if (searchSiblings)
            {
                var nextSibling = xmlNode.NextSibling;
                while (nextSibling != null)
                {
                    var siblingAttribute = GetAttributeValue(nextSibling, nodeName, attributeName, false, out found);
                    if (found)
                    {
                        return siblingAttribute;
                    }

                    nextSibling = nextSibling.NextSibling;
                }
            }

            return "";
        }
}

Related Tutorials