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Articles / Programming Languages / XML
 

A Custom .NET XML Serialization Library

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4.43/5 (4 votes)
25 Jan 200611 min read 42.3K   432   21  
Describes a custom XML serialization library, with functionality to compare for, and to combine differences
 
using System;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing;
using System.IO;

using Wxv.Wml;
using Wxv.Wml.Serialization;
using Wxv.Wml.Transactions;

namespace Wxv.WmlDemo
{
	public class MainForm : System.Windows.Forms.Form
	{
		private System.Windows.Forms.MainMenu mainMenu;
		private System.Windows.Forms.MenuItem editMenuItem;
		private System.Windows.Forms.MenuItem fileMenuItem;
		private System.Windows.Forms.MenuItem exitMenuItem;
		private System.Windows.Forms.MenuItem menuItem2;
		private System.Windows.Forms.MenuItem undoMenuItem;
		private Wxv.WmlDemo.MenuImage menuImages;
		private System.Windows.Forms.ImageList menuImageList;
		private System.Windows.Forms.MenuItem menuItem10;
		private System.Windows.Forms.MenuItem redoMenuItem;
		private System.Windows.Forms.MenuItem helpMenuItem;
		private System.Windows.Forms.MenuItem aboutMenuItem;
		private System.Windows.Forms.StatusBar statusBar1;
		private System.Windows.Forms.Panel dataPanel;
		private System.Windows.Forms.Panel undoRedoPanel;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Panel dataEditPanel;
		private System.Windows.Forms.Panel redoPanel;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.RichTextBox dataTextBox;
		private System.Windows.Forms.RichTextBox redoTextBox;
		private System.Windows.Forms.Button modifyButton;
		private System.Windows.Forms.Button undoButton;
		private System.Windows.Forms.Button redoButton;
		private System.Windows.Forms.Splitter horSplitter;
		private System.Windows.Forms.Splitter verSplitter;
		private System.Windows.Forms.MenuItem modifyMenuItem;
		private System.Windows.Forms.RichTextBox undoTextBox;
		private System.Windows.Forms.MenuItem newMenuItem;
		private System.Windows.Forms.MenuItem openMenuItem;
		private System.Windows.Forms.MenuItem saveAsMenuItem;
		private System.Windows.Forms.OpenFileDialog openFileDialog;
		private System.Windows.Forms.SaveFileDialog saveFileDialog;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem showTypeInformationMenuItem;
		private System.ComponentModel.IContainer components;

		public MainForm()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(MainForm));
			this.menuImageList = new System.Windows.Forms.ImageList(this.components);
			this.mainMenu = new System.Windows.Forms.MainMenu();
			this.fileMenuItem = new System.Windows.Forms.MenuItem();
			this.newMenuItem = new System.Windows.Forms.MenuItem();
			this.openMenuItem = new System.Windows.Forms.MenuItem();
			this.saveAsMenuItem = new System.Windows.Forms.MenuItem();
			this.menuItem10 = new System.Windows.Forms.MenuItem();
			this.exitMenuItem = new System.Windows.Forms.MenuItem();
			this.editMenuItem = new System.Windows.Forms.MenuItem();
			this.modifyMenuItem = new System.Windows.Forms.MenuItem();
			this.menuItem2 = new System.Windows.Forms.MenuItem();
			this.undoMenuItem = new System.Windows.Forms.MenuItem();
			this.redoMenuItem = new System.Windows.Forms.MenuItem();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.showTypeInformationMenuItem = new System.Windows.Forms.MenuItem();
			this.helpMenuItem = new System.Windows.Forms.MenuItem();
			this.aboutMenuItem = new System.Windows.Forms.MenuItem();
			this.menuImages = new Wxv.WmlDemo.MenuImage(this.components);
			this.statusBar1 = new System.Windows.Forms.StatusBar();
			this.dataPanel = new System.Windows.Forms.Panel();
			this.dataTextBox = new System.Windows.Forms.RichTextBox();
			this.dataEditPanel = new System.Windows.Forms.Panel();
			this.redoButton = new System.Windows.Forms.Button();
			this.undoButton = new System.Windows.Forms.Button();
			this.modifyButton = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.undoRedoPanel = new System.Windows.Forms.Panel();
			this.undoTextBox = new System.Windows.Forms.RichTextBox();
			this.horSplitter = new System.Windows.Forms.Splitter();
			this.redoPanel = new System.Windows.Forms.Panel();
			this.redoTextBox = new System.Windows.Forms.RichTextBox();
			this.label3 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.verSplitter = new System.Windows.Forms.Splitter();
			this.openFileDialog = new System.Windows.Forms.OpenFileDialog();
			this.saveFileDialog = new System.Windows.Forms.SaveFileDialog();
			this.dataPanel.SuspendLayout();
			this.dataEditPanel.SuspendLayout();
			this.undoRedoPanel.SuspendLayout();
			this.redoPanel.SuspendLayout();
			this.SuspendLayout();
			// 
			// menuImageList
			// 
			this.menuImageList.ImageSize = new System.Drawing.Size(16, 16);
			this.menuImageList.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("menuImageList.ImageStream")));
			this.menuImageList.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// mainMenu
			// 
			this.mainMenu.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.fileMenuItem,
																					 this.editMenuItem,
																					 this.helpMenuItem});
			// 
			// fileMenuItem
			// 
			this.fileMenuItem.Index = 0;
			this.fileMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																						 this.newMenuItem,
																						 this.openMenuItem,
																						 this.saveAsMenuItem,
																						 this.menuItem10,
																						 this.exitMenuItem});
			this.fileMenuItem.Text = "&File";
			// 
			// newMenuItem
			// 
			this.newMenuItem.Index = 0;
			this.menuImages.SetMenuImage(this.newMenuItem, "4");
			this.newMenuItem.OwnerDraw = true;
			this.newMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlN;
			this.newMenuItem.Text = "&New";
			this.newMenuItem.Click += new System.EventHandler(this.newMenuItem_Click);
			// 
			// openMenuItem
			// 
			this.openMenuItem.Index = 1;
			this.menuImages.SetMenuImage(this.openMenuItem, "5");
			this.openMenuItem.OwnerDraw = true;
			this.openMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlO;
			this.openMenuItem.Text = "&Open...";
			this.openMenuItem.Click += new System.EventHandler(this.openMenuItem_Click);
			// 
			// saveAsMenuItem
			// 
			this.saveAsMenuItem.Index = 2;
			this.menuImages.SetMenuImage(this.saveAsMenuItem, "6");
			this.saveAsMenuItem.OwnerDraw = true;
			this.saveAsMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlS;
			this.saveAsMenuItem.Text = "Save &As...";
			this.saveAsMenuItem.Click += new System.EventHandler(this.saveAsMenuItem_Click);
			// 
			// menuItem10
			// 
			this.menuItem10.Index = 3;
			this.menuImages.SetMenuImage(this.menuItem10, null);
			this.menuItem10.OwnerDraw = true;
			this.menuItem10.Text = "-";
			// 
			// exitMenuItem
			// 
			this.exitMenuItem.Index = 4;
			this.menuImages.SetMenuImage(this.exitMenuItem, "2");
			this.exitMenuItem.OwnerDraw = true;
			this.exitMenuItem.Text = "E&xit";
			this.exitMenuItem.Click += new System.EventHandler(this.exitMenuItem_Click);
			// 
			// editMenuItem
			// 
			this.editMenuItem.Index = 1;
			this.editMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																						 this.modifyMenuItem,
																						 this.menuItem2,
																						 this.undoMenuItem,
																						 this.redoMenuItem,
																						 this.menuItem1,
																						 this.showTypeInformationMenuItem});
			this.editMenuItem.Text = "&Edit";
			// 
			// modifyMenuItem
			// 
			this.modifyMenuItem.Index = 0;
			this.menuImages.SetMenuImage(this.modifyMenuItem, "7");
			this.modifyMenuItem.OwnerDraw = true;
			this.modifyMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlM;
			this.modifyMenuItem.Text = "&Modify";
			this.modifyMenuItem.Click += new System.EventHandler(this.modifyMenuItem_Click);
			// 
			// menuItem2
			// 
			this.menuItem2.Index = 1;
			this.menuImages.SetMenuImage(this.menuItem2, null);
			this.menuItem2.OwnerDraw = true;
			this.menuItem2.Text = "-";
			// 
			// undoMenuItem
			// 
			this.undoMenuItem.Index = 2;
			this.menuImages.SetMenuImage(this.undoMenuItem, "0");
			this.undoMenuItem.OwnerDraw = true;
			this.undoMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlZ;
			this.undoMenuItem.Text = "&Undo";
			this.undoMenuItem.Click += new System.EventHandler(this.undoMenuItem_Click);
			// 
			// redoMenuItem
			// 
			this.redoMenuItem.Index = 3;
			this.menuImages.SetMenuImage(this.redoMenuItem, "1");
			this.redoMenuItem.OwnerDraw = true;
			this.redoMenuItem.Shortcut = System.Windows.Forms.Shortcut.CtrlY;
			this.redoMenuItem.Text = "&Redo";
			this.redoMenuItem.Click += new System.EventHandler(this.redoMenuItem_Click);
			// 
			// menuItem1
			// 
			this.menuItem1.Index = 4;
			this.menuImages.SetMenuImage(this.menuItem1, null);
			this.menuItem1.OwnerDraw = true;
			this.menuItem1.Text = "-";
			// 
			// showTypeInformationMenuItem
			// 
			this.showTypeInformationMenuItem.Index = 5;
			this.menuImages.SetMenuImage(this.showTypeInformationMenuItem, null);
			this.showTypeInformationMenuItem.OwnerDraw = true;
			this.showTypeInformationMenuItem.Text = "&Show Type Information";
			this.showTypeInformationMenuItem.Click += new System.EventHandler(this.showTypeInformationMenuItem_Click);
			// 
			// helpMenuItem
			// 
			this.helpMenuItem.Index = 2;
			this.helpMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																						 this.aboutMenuItem});
			this.helpMenuItem.Text = "&Help";
			// 
			// aboutMenuItem
			// 
			this.aboutMenuItem.Index = 0;
			this.menuImages.SetMenuImage(this.aboutMenuItem, "3");
			this.aboutMenuItem.OwnerDraw = true;
			this.aboutMenuItem.Text = "&About";
			this.aboutMenuItem.Click += new System.EventHandler(this.aboutMenuItem_Click);
			// 
			// menuImages
			// 
			this.menuImages.ImageList = this.menuImageList;
			// 
			// statusBar1
			// 
			this.statusBar1.Location = new System.Drawing.Point(0, 391);
			this.statusBar1.Name = "statusBar1";
			this.statusBar1.Size = new System.Drawing.Size(744, 18);
			this.statusBar1.TabIndex = 0;
			// 
			// dataPanel
			// 
			this.dataPanel.Controls.Add(this.dataTextBox);
			this.dataPanel.Controls.Add(this.dataEditPanel);
			this.dataPanel.Controls.Add(this.label1);
			this.dataPanel.Dock = System.Windows.Forms.DockStyle.Fill;
			this.dataPanel.Location = new System.Drawing.Point(0, 0);
			this.dataPanel.Name = "dataPanel";
			this.dataPanel.Size = new System.Drawing.Size(397, 391);
			this.dataPanel.TabIndex = 1;
			// 
			// dataTextBox
			// 
			this.dataTextBox.Dock = System.Windows.Forms.DockStyle.Fill;
			this.dataTextBox.Font = new System.Drawing.Font("Lucida Console", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.dataTextBox.Location = new System.Drawing.Point(0, 18);
			this.dataTextBox.Name = "dataTextBox";
			this.dataTextBox.ReadOnly = true;
			this.dataTextBox.Size = new System.Drawing.Size(397, 333);
			this.dataTextBox.TabIndex = 2;
			this.dataTextBox.Text = "dataTextBox";
			// 
			// dataEditPanel
			// 
			this.dataEditPanel.Controls.Add(this.redoButton);
			this.dataEditPanel.Controls.Add(this.undoButton);
			this.dataEditPanel.Controls.Add(this.modifyButton);
			this.dataEditPanel.Dock = System.Windows.Forms.DockStyle.Bottom;
			this.dataEditPanel.Location = new System.Drawing.Point(0, 351);
			this.dataEditPanel.Name = "dataEditPanel";
			this.dataEditPanel.Size = new System.Drawing.Size(397, 40);
			this.dataEditPanel.TabIndex = 1;
			// 
			// redoButton
			// 
			this.redoButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
			this.redoButton.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.redoButton.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
			this.redoButton.ImageIndex = 0;
			this.redoButton.ImageList = this.menuImageList;
			this.redoButton.Location = new System.Drawing.Point(271, 8);
			this.redoButton.Name = "redoButton";
			this.redoButton.Size = new System.Drawing.Size(120, 23);
			this.redoButton.TabIndex = 2;
			this.redoButton.Text = "&Redo";
			this.redoButton.Click += new System.EventHandler(this.redoMenuItem_Click);
			// 
			// undoButton
			// 
			this.undoButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
			this.undoButton.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.undoButton.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
			this.undoButton.ImageIndex = 0;
			this.undoButton.Location = new System.Drawing.Point(143, 8);
			this.undoButton.Name = "undoButton";
			this.undoButton.Size = new System.Drawing.Size(120, 23);
			this.undoButton.TabIndex = 1;
			this.undoButton.Text = "&Undo";
			this.undoButton.Click += new System.EventHandler(this.undoMenuItem_Click);
			// 
			// modifyButton
			// 
			this.modifyButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
			this.modifyButton.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.modifyButton.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
			this.modifyButton.ImageIndex = 0;
			this.modifyButton.Location = new System.Drawing.Point(15, 8);
			this.modifyButton.Name = "modifyButton";
			this.modifyButton.Size = new System.Drawing.Size(120, 23);
			this.modifyButton.TabIndex = 0;
			this.modifyButton.Text = "&Modify";
			this.modifyButton.Click += new System.EventHandler(this.modifyMenuItem_Click);
			// 
			// label1
			// 
			this.label1.Dock = System.Windows.Forms.DockStyle.Top;
			this.label1.Location = new System.Drawing.Point(0, 0);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(397, 18);
			this.label1.TabIndex = 0;
			this.label1.Text = "data: ";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// undoRedoPanel
			// 
			this.undoRedoPanel.Controls.Add(this.undoTextBox);
			this.undoRedoPanel.Controls.Add(this.horSplitter);
			this.undoRedoPanel.Controls.Add(this.redoPanel);
			this.undoRedoPanel.Controls.Add(this.label2);
			this.undoRedoPanel.Dock = System.Windows.Forms.DockStyle.Right;
			this.undoRedoPanel.Location = new System.Drawing.Point(400, 0);
			this.undoRedoPanel.Name = "undoRedoPanel";
			this.undoRedoPanel.Size = new System.Drawing.Size(344, 391);
			this.undoRedoPanel.TabIndex = 2;
			// 
			// undoTextBox
			// 
			this.undoTextBox.Dock = System.Windows.Forms.DockStyle.Fill;
			this.undoTextBox.Font = new System.Drawing.Font("Lucida Console", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.undoTextBox.Location = new System.Drawing.Point(0, 18);
			this.undoTextBox.Name = "undoTextBox";
			this.undoTextBox.ReadOnly = true;
			this.undoTextBox.Size = new System.Drawing.Size(344, 178);
			this.undoTextBox.TabIndex = 2;
			this.undoTextBox.Text = "undoTextBox";
			// 
			// horSplitter
			// 
			this.horSplitter.Dock = System.Windows.Forms.DockStyle.Bottom;
			this.horSplitter.Location = new System.Drawing.Point(0, 196);
			this.horSplitter.Name = "horSplitter";
			this.horSplitter.Size = new System.Drawing.Size(344, 3);
			this.horSplitter.TabIndex = 11;
			this.horSplitter.TabStop = false;
			// 
			// redoPanel
			// 
			this.redoPanel.Controls.Add(this.redoTextBox);
			this.redoPanel.Controls.Add(this.label3);
			this.redoPanel.Dock = System.Windows.Forms.DockStyle.Bottom;
			this.redoPanel.Location = new System.Drawing.Point(0, 199);
			this.redoPanel.Name = "redoPanel";
			this.redoPanel.Size = new System.Drawing.Size(344, 192);
			this.redoPanel.TabIndex = 10;
			// 
			// redoTextBox
			// 
			this.redoTextBox.Dock = System.Windows.Forms.DockStyle.Fill;
			this.redoTextBox.Font = new System.Drawing.Font("Lucida Console", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.redoTextBox.Location = new System.Drawing.Point(0, 18);
			this.redoTextBox.Name = "redoTextBox";
			this.redoTextBox.ReadOnly = true;
			this.redoTextBox.Size = new System.Drawing.Size(344, 174);
			this.redoTextBox.TabIndex = 10;
			this.redoTextBox.Text = "redoTextBox";
			// 
			// label3
			// 
			this.label3.Dock = System.Windows.Forms.DockStyle.Top;
			this.label3.Location = new System.Drawing.Point(0, 0);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(344, 18);
			this.label3.TabIndex = 9;
			this.label3.Text = " redo differences: ";
			this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// label2
			// 
			this.label2.Dock = System.Windows.Forms.DockStyle.Top;
			this.label2.Location = new System.Drawing.Point(0, 0);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(344, 18);
			this.label2.TabIndex = 1;
			this.label2.Text = " undo differences: ";
			this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// verSplitter
			// 
			this.verSplitter.Dock = System.Windows.Forms.DockStyle.Right;
			this.verSplitter.Location = new System.Drawing.Point(397, 0);
			this.verSplitter.Name = "verSplitter";
			this.verSplitter.Size = new System.Drawing.Size(3, 391);
			this.verSplitter.TabIndex = 3;
			this.verSplitter.TabStop = false;
			// 
			// openFileDialog
			// 
			this.openFileDialog.Filter = "Xml files|*.xml";
			this.openFileDialog.RestoreDirectory = true;
			// 
			// saveFileDialog
			// 
			this.saveFileDialog.Filter = "Xml files|*.xml";
			this.saveFileDialog.RestoreDirectory = true;
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.AutoScroll = true;
			this.ClientSize = new System.Drawing.Size(744, 409);
			this.Controls.Add(this.dataPanel);
			this.Controls.Add(this.verSplitter);
			this.Controls.Add(this.undoRedoPanel);
			this.Controls.Add(this.statusBar1);
			this.KeyPreview = true;
			this.Menu = this.mainMenu;
			this.Name = "MainForm";
			this.Text = "Wml Demo";
			this.Load += new System.EventHandler(this.MainForm_Load);
			this.dataPanel.ResumeLayout(false);
			this.dataEditPanel.ResumeLayout(false);
			this.undoRedoPanel.ResumeLayout(false);
			this.redoPanel.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new MainForm());
		}

		private WmlTransactionLog transactionLog = new WmlTransactionLog();
		private JobPosition topJobPosition;
		private int modifyCount;

		#region Form Events
		
		private void MainForm_Load(object sender, System.EventArgs e)
		{
			topJobPosition = new JobPosition();
			topJobPosition.Randomize();
			modifyCount = 1;

			transactionLog.OnStateModified += new WmlTransactionLogNotification (OnModified);
			transactionLog.CurrentState = topJobPosition;
		}

		#endregion

		#region Menu & Button Events

		private void exitMenuItem_Click(object sender, System.EventArgs e)
		{
			Close();
		}

		private void newMenuItem_Click(object sender, System.EventArgs e)
		{
			topJobPosition = new JobPosition();
			topJobPosition.Randomize();
			modifyCount = 1;

			transactionLog.CurrentState = topJobPosition;
		}

		private void openMenuItem_Click(object sender, System.EventArgs e)
		{
			if (openFileDialog.ShowDialog() != DialogResult.OK)
				return;

			JobPosition topJobPosition0;
			try
			{
				topJobPosition0 = (JobPosition) WmlSerializer.Deserialize (openFileDialog.FileName, typeof (JobPosition));
			}
			catch (Exception ex)
			{
				MessageBox.Show (this, "Error opening file: \r\n" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
				return;
			}
		
			topJobPosition = topJobPosition0;
			modifyCount = 1;
			transactionLog.CurrentState = topJobPosition;
		}

		private void saveAsMenuItem_Click(object sender, System.EventArgs e)
		{
			if (saveFileDialog.ShowDialog() != DialogResult.OK)
				return;

			try
			{
				WmlSerializer.Serialize (topJobPosition, saveFileDialog.FileName);
			}
			catch (Exception ex)
			{
				MessageBox.Show (this, "Error saving file: \r\n" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
			}
		}

		private void modifyMenuItem_Click(object sender, System.EventArgs e)
		{
			WmlTransaction transaction = transactionLog.BeginTransaction("Modify " + modifyCount);
			try
			{
				// keep on looping until we have made a random change
				do 
				{
					topJobPosition.Randomize();
				} 
				while (WmlSerializer.Equals (transaction.PreviousState, topJobPosition));

				modifyCount++;
				transaction.Commit();
			}
			catch (Exception ex)
			{
				transaction.RollBack();

				// show any validation errors (none in this demo)
				MessageBox.Show (this, ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
			}
		}

		private void undoMenuItem_Click(object sender, System.EventArgs e)
		{
			transactionLog.RollBack();
		}

		private void redoMenuItem_Click(object sender, System.EventArgs e)
		{
			transactionLog.RollForward();
		}

		private void showTypeInformationMenuItem_Click(object sender, System.EventArgs e)
		{
			showTypeInformationMenuItem.Checked = !showTypeInformationMenuItem.Checked;
			if (showTypeInformationMenuItem.Checked)
				dataTextBox.Text = WmlSerializeTypeInfo.Types_ToString();		
			else
				RefreshView();
		}

		private void aboutMenuItem_Click(object sender, System.EventArgs e)
		{
			MessageBox.Show (this, "Wml Demo", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
		}

		#endregion

		
		private void RefreshView()
		{
			dataTextBox.Text = WmlSerializer.ToString (topJobPosition);
			modifyButton.Text = "&Modify " + modifyCount;
			modifyMenuItem.Text = "&Modify " + modifyCount;
			showTypeInformationMenuItem.Checked = false;

			if (transactionLog.CanRollBack)
			{
				undoTextBox.Text = WmlSerializer.ToString (transactionLog.RollBackTransaction.Difference);
				undoButton.Text = "&Undo " + transactionLog.RollBackTransaction.Name;
				undoButton.Enabled = true;
				undoMenuItem.Text = "&Undo " + transactionLog.RollBackTransaction.Name;
				undoMenuItem.Enabled = true;

				undoMenuItem.Visible = false;
				undoMenuItem.Visible = true; // HACK: toggling visible forces the menuItem to remeasure itself
			}
			else
			{
				undoTextBox.Text = "";
				undoButton.Text = "&Undo";
				undoButton.Enabled = false;
				undoMenuItem.Text = "&Undo";
				undoMenuItem.Enabled = false;
			}

			if (transactionLog.CanRollForward)
			{
				redoTextBox.Text = WmlSerializer.ToString (transactionLog.RollForwardTransaction.Difference);
				redoButton.Text = "&Redo " + transactionLog.RollForwardTransaction.Name;
				redoButton.Enabled = true;
				redoMenuItem.Text = "&Redo " + transactionLog.RollForwardTransaction.Name;
				redoMenuItem.Enabled = true;

				redoMenuItem.Visible = false;
				redoMenuItem.Visible = true; // HACK: toggling visible forces the menuItem to remeasure itself
			}
			else
			{
				redoTextBox.Text = "";
				redoButton.Text = "&Redo";
				redoButton.Enabled = false;
				redoMenuItem.Text = "&Redo";
				redoMenuItem.Enabled = false;
			}
		}
		
		/// <summary>
		/// Called when WmlTransactionLog detects a change to our data that its tracking.
		/// Show the data and update the UI
		/// </summary>
		private void OnModified (WmlTransactionLog transactionLog)
		{
			RefreshView();
		}



	}

}

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Written By
Wilfred Verkley
Web Developer
New Zealand New Zealand
Im a Software Developer working in Auckland, New Zealand. When i was a lot shorter, i started programming in Atari Basic, though these days its mostly C#, and a bit of java (mostly the caffinated kind).

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Posted 25 Jan 2006

Article Copyright 2006 by Wilfred Verkley
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