C#

using System;<br />
using System.Collections.Generic;<br />
using System.Text;<br />
using PersonNameSpace;   //Added to avoid using fully qualified names<br />
<br />
namespace StudentNameSpace<br />
{<br />
    public class Student : Person<br />
    {<br />
        private string major;<br />
        private int studentId;<br />
<br />
<br />
        //Default constructor<br />
        public Student() : base()    //no arguments sent to base constructor<br />
        {<br />
            major = "unknown";<br />
            studentId = 0;<br />
        }<br />
        //Constructor that sends arguments to base class<br />
        public Student(string id, string fname, string lname, string maj, int sId)<br />
            : base(id, lname, fname)    //base constructor arguments<br />
        {<br />
            major = maj;<br />
            studentId = sId;<br />
        }<br />
<br />
    //Read only Property for studentId<br />
      public int StudentId<br />
       {<br />
          get<br />
          {<br />
            return studentId;<br />
          }<br />
        }<br />
        //Propertiy for the major data field<br />
        public string Major<br />
        {<br />
          get<br />
            {<br />
                return major;<br />
            }<br />
            set<br />
            {<br />
                major = value;<br />
            }<br />
}<br />
            //Overrides GetSleepAmt() method of the Person class<br />
            public override int GetSleepAmt()<br />
            {<br />
                return 6;<br />
            }<br />
            //Using the base keyword, calls the overridden<br />
            // GetSleepAmt() method of the Person class<br />
            public int CallOverriddenGetSleepAmt()<br />
            {<br />
                return base.GetSleepAmt();<br />
            }<br />
    }<br />
}

Utini wrote:

In the DAL what I do to create them is to loop through a DataReader object and pass the DataReader into the Entity's constructor. This works fine, but I can see the limitations to this approach, not least in that the Entity in question has to know about the DataReader type.

Utini wrote:

What I'm really struggling with is how to inject the Factory Pattern into this scenario - each class in the DAL is responsible for getting different types of object, and as far as I can see they're kind of unrelated.