Automatic Error Handling

using System;
using System.Configuration;
using System.Collections.Specialized;
using System.IO;

//
// processes custom .config section as follows:
//
// <configSections>    
//	    <section name="UnhandledException" type="System.Configuration.NameValueSectionHandler, System, 
//        Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
// </configSections>
//
// <!-- settings for UnhandledExceptionManager -->
//	<UnhandledException>
//		<add key="ContactInfo" value="Ima Testguy at 123-555-1212" />
//		<add key="IgnoreDebug" value="False" />
//		<add key="IgnoreRegex" value="get_aspx_ver\.aspx" />
//		<add key="EmailTo" value="me@mydomain.com" />
//	</UnhandledException>   
//
// Complete configuration options are..
//  
//  <!-- Handler defaults -->
//  <add key="AppName" value="" />
//  <add key="ContactInfo" value="" />
//  <add key="EmailTo" value="" />
//  <add key="LogToEventLog" value="False" />
//  <add key="LogToFile" value="True" />
//  <add key="LogToEmail" value="True" />
//  <add key="LogToUI" value="True" />
//	 <add key="PathLogFile" value="" />
//  <add key="IgnoreRegex" value="" />
//  <add key="IgnoreDebug" value="True" />
//  <add key="WhatHappened" value="There was an unexpected error in this website. This may be due to a programming bug." />
//  <add key="HowUserAffected" value="The current page will not load." />
//  <add key="WhatUserCanDo" value="Close your browser, navigate back to this website, and try repeating your last action. Try alternative methods of performing the same action. If problems persist, contact (contact)." />
//
//  <!-- SMTP email configuration defaults -->
//  <add key="SmtpDefaultDomain" value="mydomain.com" />
//  <add key="SmtpServer" value="mail.mydomain.com" />
//  <add key="SmtpPort" value="25" />
//  <add key="SmtpAuthUser" value="" />
//  <add key="SmtpAuthPassword" value="" />
//

/// <summary>
/// Minimal class for retrieving typed values from the 
/// &lt;UnhandledException&gt; custom NameValueCollection .config section
/// </summary>
internal class Config
{
	private const string _strSectionName = "UnhandledException";
	private static NameValueCollection _nvc;

	private static void Load()
	{
		if( _nvc == null )
		{
			object o = null;
			try
			{
				o = System.Configuration.ConfigurationManager.GetSection( _strSectionName );
			}
			catch
			{
				// We are in an unhandled exception handler
			}

			if( o == null )
			{
				// we can work without any configuration at all (all defaults)
				_nvc = new NameValueCollection();
			}
			else
			{
				try
				{
					_nvc = (NameValueCollection)o;
				}
				catch( System.Exception ex )
				{
					throw new ConfigurationErrorsException( "The <" + _strSectionName + "> section is present in the .config file, but it does not appear to be a name value collection.", ex );
				}
			}
		}
	}

	/// <summary>
	/// retrieves integer value from the 
	/// &lt;UnhandledException&gt; custom NameValueCollection .config section
	/// </summary>
	public static int GetInteger( string key, int Default )
	{
		Load();
		string strTemp = _nvc[ key ];

		if( string.IsNullOrEmpty( strTemp ) )
			return Default;

		try
		{
			return Convert.ToInt32( strTemp );
		}
		catch( Exception )
		{
			return Default;
		}
	}

	/// <summary>
	/// retrieves boolean value from the 
	/// &lt;UnhandledException&gt; custom NameValueCollection .config section
	/// </summary>
	public static bool GetBoolean( string key, bool Default )
	{
		Load();
		string strTemp = _nvc[ key ];

		if( string.IsNullOrEmpty( strTemp ) )
			return Default;

		switch( strTemp.Substring( 0, 1 ).ToLower() )
		{
		case "1":
		case "t":
		case "y":
			return true;

		default:
			return false;
		}
	}

	/// <summary>
	/// retrieves string value from the 
	/// &lt;UnhandledException&gt; custom NameValueCollection .config section
	/// </summary>
	public static string GetString( string key, string Default )
	{
		Load();
		string strTemp = _nvc[ key ];

		if( string.IsNullOrEmpty( strTemp ) )
			return Default;

		return strTemp;
	}

	/// <summary>
	/// retrieves relative or absolute path string from the 
	/// &lt;UnhandledException&gt; custom NameValueCollection .config section
	/// </summary>
	public static string GetPath( string Key )
	{
		Load();
		string strPath = GetString( Key, "" );

		// users might think we're using Server.MapPath, but we're not
		// strip this because it's unnecessary (we assume website root, if path isn't rooted)
		if( strPath.StartsWith( "~/" ) )
			strPath = strPath.Replace( "~/", "" );

		if( Path.IsPathRooted( strPath ) )
			return strPath;
		else
			return Path.Combine( AppBase, strPath );
	}

	private static string AppBase
	{
		get { return Convert.ToString( System.AppDomain.CurrentDomain.GetData( "APPBASE" ) ); }
	}
}