enumerators

[juan]

hi i have an arraylist that has doctor objects with various properties,
members and methods.

i want to enumerate this arraylist object.
but i dont understand how.
this is what i have done
ArrayList arrDoctors = Doctors.GetAllDoctors();
for (int cnt =0;cnt<1; cnt++)
{
Doctor p = (Doctor) arrDoctors[cnt];
Messagebox.show (p.Name);
//many other properties
}
what is the advantage of enumerators over what i have done?

and how do i implement them for my doctors array

[Branimir Giurov]

The only advantage is that you'll be using a foreach statement.
But you'll still have to cast the Current object to a Doctor.

In v 2.0 of the Framework, the generics are gonna make our lifes much easier
in cases like yours, but for now, you can't use 'em.
Cheers,
Branimir

--
Branimir Giurov
MCSD.NET, MCDBA, MCT
eAgility LLC
"juan" <ic***@hotmail.com> wrote in message
news:er**************@TK2MSFTNGP09.phx.gbl...

hi i have an arraylist that has doctor objects with various properties,
members and methods.

i want to enumerate this arraylist object.
but i dont understand how.
this is what i have done
ArrayList arrDoctors = Doctors.GetAllDoctors();
for (int cnt =0;cnt<1; cnt++)
{
Doctor p = (Doctor) arrDoctors[cnt];
Messagebox.show (p.Name);
//many other properties
}
what is the advantage of enumerators over what i have done?

and how do i implement them for my doctors array

[Miha Markic [MVP C#]]

Hi juan,

foreach (Doctor p in Doctors.GetAllDoctors())
{
Messagebox.show (p.Name);
}

The advantage is more readable code.

--
Miha Markic [MVP C#] - RightHand .NET consulting & software development
miha at rthand com
www.rthand.com

"juan" <ic***@hotmail.com> wrote in message
news:er**************@TK2MSFTNGP09.phx.gbl...

hi i have an arraylist that has doctor objects with various properties,
members and methods.

i want to enumerate this arraylist object.
but i dont understand how.
this is what i have done
ArrayList arrDoctors = Doctors.GetAllDoctors();
for (int cnt =0;cnt<1; cnt++)
{
Doctor p = (Doctor) arrDoctors[cnt];
Messagebox.show (p.Name);
//many other properties
}
what is the advantage of enumerators over what i have done?

and how do i implement them for my doctors array

[juan]

but dont i have to derive a class from IEnumerable interface?
"Miha Markic [MVP C#]" <miha at rthand com> wrote in message
news:u9*************@TK2MSFTNGP10.phx.gbl...

Hi juan,

foreach (Doctor p in Doctors.GetAllDoctors())
{
Messagebox.show (p.Name);
}

The advantage is more readable code.

--
Miha Markic [MVP C#] - RightHand .NET consulting & software development
miha at rthand com
www.rthand.com

"juan" <ic***@hotmail.com> wrote in message
news:er**************@TK2MSFTNGP09.phx.gbl...

hi i have an arraylist that has doctor objects with various properties,
members and methods.

i want to enumerate this arraylist object.
but i dont understand how.
this is what i have done
ArrayList arrDoctors = Doctors.GetAllDoctors();
for (int cnt =0;cnt<1; cnt++)
{
Doctor p = (Doctor) arrDoctors[cnt];
Messagebox.show (p.Name);
//many other properties
}
what is the advantage of enumerators over what i have done?

and how do i implement them for my doctors array

[Jon Skeet [C# MVP]]

juan <ic***@hotmail.com> wrote:

but dont i have to derive a class from IEnumerable interface?

Doctors itself doesn't have to - Doctors.GetAllDoctors() returns an
ArrayList, and *that* can be enumerated.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Rahul Anand]

Hi Juan,

You can directly enumerate an "ArrayList" with *foreach* construct.

You will get the advantage of enumerator when you implement
*IEnumerator* and *IEnumerable* interfaces in your "Doctors"
collection class.

In which case you will not be required to populate an extra ArrayList
but can directly enumerate the "Doctors" using *foreach* construct.
public interface IEnumerable {
IEnumerator GetEnumerator();
}

public interface IEnumerator {
Boolean MoveNext();
Object Current { get; }
void Reset();
}

You can check these links for more info:
http://www.codeguru.com/Csharp/Cshar...icle.php/c5505
http://msdn.microsoft.com/library/de...spec_9_3_1.asp
Hope it will help.

--
Cheers,
Rahul Anand
"juan" <ic***@hotmail.com> wrote in message news:<er**************@TK2MSFTNGP09.phx.gbl>...

hi i have an arraylist that has doctor objects with various properties,
members and methods.

i want to enumerate this arraylist object.
but i dont understand how.
this is what i have done
ArrayList arrDoctors = Doctors.GetAllDoctors();
for (int cnt =0;cnt<1; cnt++)
{
Doctor p = (Doctor) arrDoctors[cnt];
Messagebox.show (p.Name);
//many other properties
}
what is the advantage of enumerators over what i have done?

and how do i implement them for my doctors array