New MessageBoxAppender

[Henry Padilla]

Please feel free to include this code in the next build.  (By the way, when 
will that be?)

Tom Padilla
#region Copyright
//
// This framework is based on log4j see http://jakarta.apache.org/log4j
// Copyright (C) The Apache Software Foundation. All rights reserved.
//
// This software is published under the terms of the Apache Software
// License version 1.1, a copy of which has been included with this
// distribution in the LICENSE.txt file.
//
// Extended by Tom Padilla
//
#endregion
using System;
using System.Globalization;
using System.Windows.Forms;
using log4net.Layout;
using log4net.spi;
namespace log4net.Appender
{
	/// <summary>
	/// Appends logging events to the console.
	/// </summary>
	/// <remarks>
	/// <para>
	/// MessageBoxAppender sends log events to the standard MessageBox output 
stream
	/// using a layout specified by the user.  This adds support for [title] 
and [text]
	/// labels for formatting the MessageBox.
	/// </para>
	/// </remarks>
	public class MessageBoxAppender : AppenderSkeleton
	{
		#region Public Instance Constructors

		/// <summary>
		/// Initializes a new instance of the <see cref="MessageBoxAppender" /> 
class.
		/// </summary>
		/// <remarks>
		/// The instance of the <see cref="MessageBoxAppender" /> class is set up 
to write
		/// to the standard MessageBox output stream.
		/// </remarks>
		public MessageBoxAppender()
		{
		}

		/// <summary>
		/// Initializes a new instance of the <see cref="MessageBoxAppender" /> 
class
		/// with the specified layout.
		/// </summary>
		/// <param name="layout">the layout to use for this appender</param>
		/// <remarks>
		/// The instance of the <see cref="MessageBoxAppender" /> class is set up 
to write
		/// to the standard MessageBox output stream.
		/// </remarks>
		public MessageBoxAppender(ILayout layout)
		{
			Layout = layout;
		}

                #endregion Public Instance Constructors
                #region Public Instance Properties
                //
                // None
                //
                #endregion Public Instance Properties
                #region Override implementation of AppenderSkeleton
                /// <summary>
                /// This method determines if there is a sense in attempting to 
append.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This method checked if a layout has been set.
                /// </para>
                /// </remarks>
                /// <returns><c>false</c> if any of the preconditions 
fail.</returns>
                override protected bool PreAppendCheck()
                {
                        if (!base.PreAppendCheck())
                        {
                                return false;
                        }
                        return true;
                }
		/// <summary>
		/// This method is called by the <see cref="AppenderSkeleton.DoAppend"/> 
method.
		/// </summary>
		/// <param name="loggingEvent">The event to log.</param>
		/// <remarks>
		/// <para>
		/// Writes the event to a MessageBox.  Uses [title] and [text] labels to 
format the message.
		/// Will default to Application.ProductName + " " + 
Application.ProductVersion.
		/// </para>
		/// <para>
		/// The format of the output will depend on the appender's layout.
		/// </para>
		/// </remarks>
		override protected void Append(LoggingEvent loggingEvent)
		{
			string strEventString;
			string strTitleString;
			string strTextString;
			int iTitleIndex;
			int iTextIndex;

                        strEventString = RenderLoggingEvent(loggingEvent);
                        iTitleIndex = strEventString.IndexOf("[title]");
                        iTextIndex = strEventString.IndexOf("[text]");
			if ((iTitleIndex == -1) || (iTextIndex == -1))
			{
				MessageBox.Show(strEventString, Application.ProductName + " " + 
Application.ProductVersion  );
				return;
			}

			if (iTitleIndex < iTextIndex)
			{
				strTitleString = strEventString.Substring(iTitleIndex + 7, iTextIndex - 
7);
				strTextString = strEventString.Substring(iTextIndex + 6, 
strEventString.Length - (iTextIndex + 6));

			}
			else
			{
				strTitleString = strEventString.Substring(iTitleIndex + 7, 
strEventString.Length - (iTitleIndex + 7));
				strTextString = strEventString.Substring(iTextIndex + 6, iTitleIndex);
			}

                        MessageBox.Show(strTextString, strTitleString);
                }
                /// <summary>
                /// This appender requires a <see cref="Layout"/> to be set.
                /// </summary>
                /// <value><c>true</c></value>
                override protected bool RequiresLayout
                {
                        get { return true; }
                }
                #endregion Override implementation of AppenderSkeleton
                #region Public Static Fields
                //
                // None
                //
                #endregion Public Static Fields
                #region Private Instances Fields
                //
                // None
                //
                #endregion Private Instances Fields
        }
}