--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HowTo/Reflection/ObjectFactory.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+
+using NUnit.Framework;
+
+using BLToolkit.Data;
+using BLToolkit.Mapping;
+using BLToolkit.Reflection;
+
+namespace HowTo.Reflection
+{
+	[TestFixture]
+	public class ObjectFactoryTest
+	{
+		/*[a]*/[ObjectFactory(typeof(Person.ObjectFactory))]/*[/a]*/
+		public class Person
+		{
+			[MapField("PersonID")]
+			public int    ID;
+
+			public string LastName;
+			public string FirstName;
+			public string MiddleName;
+
+			/*[a]*/class ObjectFactory : IObjectFactory/*[/a]*/
+			{
+				public object /*[a]*/CreateInstance(TypeAccessor typeAccessor, InitContext context)/*[/a]*/
+				{
+					// Get the object type indicator field.
+					//
+					object objectType = context.DataSource.GetValue(context.SourceObject, "PersonType");
+
+					// Target ObjectMapper must be changed in order to provide correct mapping.
+					//
+					switch ((string)objectType)
+					{
+						case "D": /*[a]*/context.ObjectMapper = ObjectMapper<Doctor>. Instance;/*[/a]*/ break;
+						case "P": /*[a]*/context.ObjectMapper = ObjectMapper<Patient>.Instance;/*[/a]*/ break;
+					}
+
+					// Create an object instance.
+					// Do not call ObjectMapper.CreateInstance as it will lead to infinite recursion.
+					//
+					return context.ObjectMapper./*[a]*/TypeAccessor/*[/a]*/.CreateInstance(context);
+				}
+			}
+		}
+
+		public class /*[a]*/Doctor : Person/*[/a]*/
+		{
+			public string Taxonomy;
+		}
+
+		public class /*[a]*/Patient : Person/*[/a]*/
+		{
+			public string Diagnosis;
+		}
+
+		[Test]
+		public void Test()
+		{
+			using (DbManager db = new DbManager())
+			{
+				List<Person> list = db
+					.SetCommand(@"
+						SELECT
+							ps.*,
+							d.Taxonomy,
+							p.Diagnosis,
+							CASE
+								WHEN d.PersonID IS NOT NULL THEN 'D'
+								WHEN p.PersonID IS NOT NULL THEN 'P'
+							END as PersonType
+						FROM
+							Person ps
+								LEFT JOIN Doctor  d ON d.PersonID = ps.PersonID
+								LEFT JOIN Patient p ON p.PersonID = ps.PersonID
+						ORDER BY
+							ps.PersonID")
+					.ExecuteList<Person>();
+
+				Assert.AreEqual(list[0].GetType(), /*[a]*/typeof(Doctor)/*[/a]*/);
+				Assert.AreEqual(list[1].GetType(), /*[a]*/typeof(Patient)/*[/a]*/);
+
+				if (list.Count > 2)
+					Assert.AreEqual(list[2].GetType(), typeof(Person));
+			}
+		}
+	}
+}