Declarative Programming Of The MVC Pattern Within The Context Of DataBinding

/*
 * Copyright (c) 2004 Marc Clifton
 * All Rights Reserved
 * 
 * License: GNU General Public License, see doc\license.txt
 * http://www.gnu.org/licenses/licenses.html#GPL
 * Owner: Marc Clifton email: webmaster@knowledgeautomation.com
 * First release published:
 * http://www.codeproject.com/cs/miscctrl/xmlGuiGenerator.asp
 * 2/25/04
*/

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;
using System.Xml;

namespace MyXaml.Extensions
{
	[TypeConverter(typeof(DataSourceTypeConverter))]
	public class DataSource
	{
		protected DataTable source;
		protected string field;
		protected string name;
		
		public DataTable Source
		{
			get {return source;}
			set {source=value;}
		}

		public string Field
		{
			get {return field;}
			set {field=value;}
		}

		public string Name
		{
			get {return name;}
			set {name=value;}
		}

		public DataSource()
		{
		}

		public override string ToString()
		{
			if ( (source != null) && (field != null) )
			{
				return (string)source.Rows[0][field];
			}
			return "";
		}
	}

	public class DataSourceTypeConverter : TypeConverter
	{
		public override bool CanConvertTo(ITypeDescriptorContext context, Type t)
		{
			if (t.FullName=="System.Object") return true;
			if (t.FullName=="System.Data.DataTable") return true;
			return false;
		}

		public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
		{
			object ret=null;
			DataSource ds=(DataSource)value;
			if (destinationType.FullName=="System.Object")
			{
				// return the DataTable when being assigned the a DataSource property.
				ret=ds.Source;
			}
			else
			if (destinationType.FullName=="System.Data.DataTable")
			{
				ret=ds.Source;
			}
			return ret;
		}
	}
}