IEnumerable<T>

Question

When I code

public class SomeInumerableDat :  IEnumerable<SqlDataRecord>

{

}

And then click on Implement interface two methods are created.

 

public class SomeInumerableDat :  IEnumerable<SqlDataRecord>

{

#region IEnumerable<SqlDataRecord> Members

 

public IEnumerator<SqlDataRecord> GetEnumerator ()

{

     throw new NotImplementedException ();

}

 

#endregion

 

#region IEnumerable Members

 

System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()

{

     throw new NotImplementedException ();

}

 

#endregion

}

 

I am not sure what each one is used for. Do I put the same code in both? When does each get used?

 

---

Tom

Answer 1

Yes you can use the same code or common code. The idea is that IEnumerable is expressed in two different formats for two different consumers; hence it ensures a defacto overloading of those operations.

---

William Wegerson (www.OmegaCoder.Com)

Answer 2

Specifically IEnumerable<T> derives from IEnumerable and so both interfaces must be implemented.

public IEnumerator<SqlDataRecord> GetEnumerator ()

{

     // create and return enumerator
}

IEnumerator IEnumerable.GetEnumerator()

{

     return GetEnumerator(); // delegate to the one above
}