Rony-Beck_AgriStock/AgriStockApp/Scripts/XMLConverter.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Xml;

namespace AgriStockApp.Scripts
{
    public static class XMLConverter
    {
        public static string XmlToJSON(string xml)
        {
            XmlDocument doc = new XmlDocument();
            doc.XmlResolver = null;
            try { doc.LoadXml(xml.Substring(xml.IndexOf(Environment.NewLine))); }
            catch
            {
                Encoding encoding = Encoding.UTF8;
                // Encode the XML string in a byte array
                byte[] encodedString = encoding.GetBytes(xml);

                // Put the byte array into a stream and rewind it to the beginning
                using (var ms = new MemoryStream(encodedString))
                {
                    ms.Flush();
                    ms.Position = 0;

                    // Build the XmlDocument from the MemorySteam of UTF-8 encoded bytes
                    doc.Load(ms);
                }
            }

            return XmlToJSON(doc);
        }
        public static string XmlToJSON(XmlDocument xmlDoc)
        {
            StringBuilder sbJSON = new StringBuilder();
            sbJSON.Append("{ ");
            XmlToJSONnode(sbJSON, xmlDoc.DocumentElement, true);
            sbJSON.Append("}");
            return sbJSON.ToString();
        }

        //  XmlToJSONnode:  Output an XmlElement, possibly as part of a higher array
        private static void XmlToJSONnode(StringBuilder sbJSON, XmlElement node, bool showNodeName)
        {
            if (showNodeName)
                sbJSON.Append("\"" + SafeJSON(node.Name) + "\": ");
            sbJSON.Append("{");
            // Build a sorted list of key-value pairs
            //  where   key is case-sensitive nodeName
            //          value is an ArrayList of string or XmlElement
            //  so that we know whether the nodeName is an array or not.
            SortedList<string, object> childNodeNames = new SortedList<string, object>();

            //  Add in all node attributes
            if (node.Attributes != null)
                foreach (XmlAttribute attr in node.Attributes)
                    StoreChildNode(childNodeNames, attr.Name, attr.InnerText);

            //  Add in all nodes
            foreach (XmlNode cnode in node.ChildNodes)
            {
                if (cnode is XmlText)
                    StoreChildNode(childNodeNames, "value", cnode.InnerText);
                else if (cnode is XmlElement)
                    StoreChildNode(childNodeNames, cnode.Name, cnode);
            }

            // Now output all stored info
            foreach (string childname in childNodeNames.Keys)
            {
                List<object> alChild = (List<object>)childNodeNames[childname];
                if (alChild.Count == 1)
                    OutputNode(childname, alChild[0], sbJSON, true);
                else
                {
                    sbJSON.Append(" \"" + SafeJSON(childname) + "\": [ ");
                    foreach (object Child in alChild)
                        OutputNode(childname, Child, sbJSON, false);
                    sbJSON.Remove(sbJSON.Length - 2, 2);
                    sbJSON.Append(" ], ");
                }
            }
            sbJSON.Remove(sbJSON.Length - 2, 2);
            sbJSON.Append(" }");
        }

        //  StoreChildNode: Store data associated with each nodeName
        //                  so that we know whether the nodeName is an array or not.
        private static void StoreChildNode(SortedList<string, object> childNodeNames, string nodeName, object nodeValue)
        {
            // Pre-process contraction of XmlElement-s
            if (nodeValue is XmlElement)
            {
                // Convert  <aa></aa> into "aa":null
                //          <aa>xx</aa> into "aa":"xx"
                XmlNode cnode = (XmlNode)nodeValue;
                if (cnode.Attributes.Count == 0)
                {
                    XmlNodeList children = cnode.ChildNodes;
                    if (children.Count == 0)
                        nodeValue = null;
                    else if (children.Count == 1 && (children[0] is XmlText))
                        nodeValue = ((XmlText)(children[0])).InnerText;
                }
            }
            // Add nodeValue to ArrayList associated with each nodeName
            // If nodeName doesn't exist then add it
            List<object> ValuesAL;

            if (childNodeNames.ContainsKey(nodeName))
            {
                ValuesAL = (List<object>)childNodeNames[nodeName];
            }
            else
            {
                ValuesAL = new List<object>();
                childNodeNames[nodeName] = ValuesAL;
            }
            ValuesAL.Add(nodeValue);
        }

        private static void OutputNode(string childname, object alChild, StringBuilder sbJSON, bool showNodeName)
        {
            if (alChild == null)
            {
                if (showNodeName)
                    sbJSON.Append("\"" + SafeJSON(childname) + "\": ");
                sbJSON.Append("null");
            }
            else if (alChild is string)
            {
                if (showNodeName)
                    sbJSON.Append("\"" + SafeJSON(childname) + "\": ");
                string sChild = (string)alChild;
                sChild = sChild.Trim();
                sbJSON.Append("\"" + SafeJSON(sChild) + "\"");
            }
            else
                XmlToJSONnode(sbJSON, (XmlElement)alChild, showNodeName);
            sbJSON.Append(", ");
        }

        // Make a string safe for JSON
        private static string SafeJSON(string sIn)
        {
            StringBuilder sbOut = new StringBuilder(sIn.Length);
            foreach (char ch in sIn)
            {
                if (Char.IsControl(ch) || ch == '\'')
                {
                    int ich = (int)ch;
                    sbOut.Append(@"\u" + ich.ToString("x4"));
                    continue;
                }
                else if (ch == '\"' || ch == '\\' || ch == '/')
                {
                    sbOut.Append('\\');
                }
                sbOut.Append(ch);
            }
            return sbOut.ToString();
        }
    }
}