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Articles / Programming Languages / Visual C++ 10.0

Linq-To-XML Style of Node Creation for C++

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12 Apr 2016Ms-PL11 min read 43.3K   500   29  
Linq-To-XML Node Creation for Native C++
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;

namespace Elmax
{
    /// <summary>
    /// Helper class to use the .NET XmlDocument's XPath methods
    /// </summary>
    public class Document
    {
        /// <summary>
        /// Non-default constructor
        /// </summary>
        /// <param name="doc"></param>
        public Document(XmlDocument doc) 
        {
            _Doc = doc;
        }
        /// <summary>
        /// Get elements by tag name
        /// </summary>
        /// <param name="tagName">Is Tag name</param>
        /// <returns>List of elements that have the same tag name</returns>
	    public List<Elmax.Element> GetElementsByTagName(string tagName)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

            List<Elmax.Element> list = new List<Elmax.Element>();

            XmlNodeList nodeList = _Doc.GetElementsByTagName(tagName);

            ConvNodeListToList(nodeList, ref list);

            return list;
        }
        /// <summary>
        /// Get elements by tag name within certain namespace URI
        /// </summary>
        /// <param name="tagName">Is Tag name</param>
        /// <param name="namespaceURI"></param>
        /// <returns>List of elements that have the same tag name</returns>
        public List<Elmax.Element> GetElementsByTagName(string tagName, string namespaceURI)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

            List<Elmax.Element> list = new List<Elmax.Element>();

            XmlNodeList nodeList = _Doc.GetElementsByTagName(tagName, namespaceURI);

            ConvNodeListToList(nodeList, ref list);

            return list;
        }
        /// <summary>
        /// Get element by Id
        /// </summary>
        /// <param name="id">is Id</param>
        /// <returns>Element</returns>
        public Elmax.Element GetElementById(string id)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

            XmlNode node = _Doc.GetElementById(id);

            if(node!=null)
                return new Element(_Doc, node, "", node.Name, true, false);

            return new Element();
        }
        /// <summary>
        /// Select the elements using XPath expression
        /// </summary>
        /// <param name="xpath">XPath expression</param>
        /// <returns>List of elements which satisfy the XPath expression</returns>
	    public List<Elmax.Element> SelectNodes(string xpath)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");
            
            List<Elmax.Element> list = new List<Elmax.Element>();

	        XmlNodeList nodeList = _Doc.SelectNodes(xpath);

	        ConvNodeListToList(nodeList, ref list);

	        return list;
        }
        /// <summary>
        /// Select the element using XPath expression
        /// </summary>
        /// <param name="xpath">XPath expression</param>
        /// <returns>Element which satisfies the XPath expression</returns>
	    public Elmax.Element SelectSingleNode(string xpath)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

	        XmlNode node = _Doc.SelectSingleNode(xpath);

            if (node != null)
            {
                return new Element(_Doc, node, "", node.Name, true, false);
            }

            return new Element();
        }
        /// <summary>
        /// Convert a list of nodes to a list of Elmax elements
        /// </summary>
        /// <param name="pList"></param>
        /// <param name="list"></param>
        private void ConvNodeListToList(XmlNodeList pList, ref List<Elmax.Element> list)
        {
	        if(pList==null)
		        return;

	        for(int i=0; i<pList.Count; ++i)
	        {
		        Element ele = new Element(_Doc, pList[i], "", pList[i].Name, true, false );
		        list.Add(ele);
	        }
        }

        /// <summary>
        /// Save with the indentation and newlines
        /// </summary>
        /// <param name="file">file path</param>
        /// <returns>true if successful</returns>
        public bool PrettySave(string file)
        {
            if (_Doc == null)
                return false;

            XmlWriter writer = null;
            try
            {
                XmlWriterSettings settings = new XmlWriterSettings();
                settings.Indent = true;
                settings.IndentChars = "  ";
                settings.NewLineChars = "\r\n";
                settings.NewLineHandling = NewLineHandling.Replace;
                settings.OmitXmlDeclaration = false;
                writer = XmlWriter.Create(file, settings);
                _Doc.Save(writer);
            }
            catch (System.Exception)
            {
                return false;            	
            }
            finally
            {
                if (writer != null)
                {
                    writer.Close();
                    writer = null;
                }
            }
            return true;
        }

        /// <summary>
        /// Internal XML document object
        /// </summary>
        private XmlDocument _Doc;
    }
}

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This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)


Written By
Software Developer (Senior)
Singapore Singapore
Shao Voon is from Singapore. His interest lies primarily in computer graphics, software optimization, concurrency, security, and Agile methodologies.

In recent years, he shifted focus to software safety research. His hobby is writing a free C++ DirectX photo slideshow application which can be viewed here.

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