Help.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.IO;

namespace Sample_Environment_Control_Interface.Dialogs.Help
{
    public partial class HelpForm : Form
    {
        private Dictionary<String, String> _pages = new Dictionary<String, String>();

        private DirectoryInfo _helpDirectory;

        public HelpForm()
        {
            InitializeComponent();
        }

        private void Help_Load(object sender, EventArgs e)
        {
            loadTreeViewXML();
            loadInstrumentXML();

            treeView1.Refresh();
            if (treeView1.Nodes != null && treeView1.Nodes.Count != 0)
            {
                treeView1_AfterSelect(this, new TreeViewEventArgs(treeView1.Nodes[0]));
            }
        }

        private void loadTreeViewXML()
        {
            try
            {
                treeView1.Nodes.Clear();

                XmlDocument dom = new XmlDocument();
                String filepath = Seci.SeciInterface.SeciStatus.ExecutionDir + "/Help Contents/";
                _helpDirectory = new DirectoryInfo(filepath);

                dom.Load(filepath + "TreeView.xml");

                //Select the top level categories
                XmlNodeList nodelist = dom.SelectNodes("/contents/category");

                parseNodeList(nodelist);  
            }
            catch (Exception ex)
            {
                MessageBox.Show("Could not open help files! Looking in " + _helpDirectory.FullName, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Seci.SeciInterface.Error_LogError("loadTreeViewXML", ex);
            }
        }

        private void loadInstrumentXML()
        {
            try
            {
                XmlDocument dom = new XmlDocument();

                FileInfo fi = new FileInfo(_helpDirectory.FullName + "InstrumentHelp.xml");

                if (fi.Exists)
                {
                    dom.Load(fi.FullName);

                    //Select the top level categories
                    XmlNodeList nodelist = dom.SelectNodes("/contents/category");

                    parseNodeList(nodelist);
                }
                else
                {
                    //Create file
                    fi.Create();
                    StreamWriter sw = new StreamWriter(fi.FullName);

                    try
                    {
                        sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");
                        sw.WriteLine("<contents>");
                        sw.WriteLine("</contents>");
                    }
                    catch
                    {
                    }
                    finally
                    {
                        sw.Close();
                    }

                }
            }
            catch (Exception ex)
            {
                Seci.SeciInterface.Error_LogError("loadInstrumentXML", ex);
            }
        }

        private void parseNodeList(XmlNodeList nodelist)
        {
            foreach (XmlNode node in nodelist)
            {
                XmlDocument nodeDoc = new XmlDocument();
                nodeDoc.LoadXml(node.OuterXml);

                String title = nodeDoc.SelectSingleNode("/category/title").InnerXml.Trim();
                String page = nodeDoc.SelectSingleNode("/category/page").InnerXml.Trim();

                treeView1.Nodes.Add(title);

                _pages.Add(title, page);

                //Select the subcategories (if any)
                XmlNodeList sublist = nodeDoc.SelectNodes("/category/subcategory");

                foreach (XmlNode sub in sublist)
                {
                    XmlDocument subDoc = new XmlDocument();
                    subDoc.LoadXml(sub.OuterXml);

                    String subTitle = subDoc.SelectSingleNode("/subcategory/title").InnerXml.Trim();
                    String subPage = subDoc.SelectSingleNode("/subcategory/page").InnerXml.Trim();

                    treeView1.Nodes[treeView1.Nodes.Count - 1].Nodes.Add(subTitle);

                    _pages.Add(subTitle, subPage);
                }
            }
        }

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            try
            {
                if (_pages.ContainsKey(e.Node.Text))
                {
                    String fileName = _pages[e.Node.Text].ToString();

                    webBrowser1.Url = new Uri(_helpDirectory.FullName + _pages[e.Node.Text].ToString());
                }
            }
            catch
            {
                MessageBox.Show("Could not find selected page.", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
      
    }
}