Ineritance: Values of parent/base class

[Darren.Ratcliffe]

Hi guys

Posted what was probably a rather confusing post about this the other
day, so I am going to have another go and see if I can make more sense.
This sis purely a

I've got a base class called animal, and from within animal you can
access lots more classes such as feline, canine, reptile and
amphibian.....

To access canine, you are going to go through animal. Animal has lots
of public properties such as height and weight that we can access from
our aspx.

So first of all I want to do animal.configur e(iHeight, iWeight).....

Inside canine, I would like to be able to access the properties of the
animal object, so i can find out how big it is, how tall it is etc etc
- does that make sense?

I can do the canine canine = new canine(); bit so that canine is a
child of animal - but I can't get animal to access the properties of
animal.

Can you help?? Awaiting you is my eternal gratitude ;)

Many thanks

Darren

[Darren.Ratcliffe]

*** SORRY! ***

In correction to the above, the next to last paragraph should read:

I can do the canine canine = new canine(); bit so that canine is a
child of animal - but I can't get CANINE to access the properties of
animal.

Thanks

Daz

[TheSteph]

Can you post some code ???

Do you dervie Canine from Animal ?

class Canine : Animal
{

}
Steph.
<Da************ **@gmail.com> wrote in message
news:11******** **************@ g10g2000cwb.goo glegroups.com.. .

Hi guys

Posted what was probably a rather confusing post about this the other
day, so I am going to have another go and see if I can make more sense.
This sis purely a

I've got a base class called animal, and from within animal you can
access lots more classes such as feline, canine, reptile and
amphibian.....

To access canine, you are going to go through animal. Animal has lots
of public properties such as height and weight that we can access from
our aspx.

So first of all I want to do animal.configur e(iHeight, iWeight).....

Inside canine, I would like to be able to access the properties of the
animal object, so i can find out how big it is, how tall it is etc etc
- does that make sense?

I can do the canine canine = new canine(); bit so that canine is a
child of animal - but I can't get animal to access the properties of
animal.

Can you help?? Awaiting you is my eternal gratitude ;)

Many thanks

Darren

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

<Da************ **@gmail.com> wrote in message
news:11******** **************@ g10g2000cwb.goo glegroups.com.. .

Hi guys
I've got a base class called animal, and from within animal you can
access lots more classes such as feline, canine, reptile and
amphibian.....
You do not access them, you derive Animal in all those other classes
To access canine, you are going to go through animal.
What you mean with this?

Inside canine, I would like to be able to access the properties of the
animal object, so i can find out how big it is, how tall it is etc etc
- does that make sense? Yes.
You will be able, unless you declare them as private

I can do the canine canine = new canine(); bit so that canine is a
child of animal - but I can't get animal to access the properties of
animal. Can you help?? Awaiting you is my eternal gratitude ;)

Post a piece of code whith what the problem is and the error you are getting

[Ignacio Machin \( .NET/ C# MVP \)]

As I said, post the code
<Da************ **@gmail.com> wrote in message
news:11******** **************@ i40g2000cwc.goo glegroups.com.. .

*** SORRY! ***

In correction to the above, the next to last paragraph should read:

I can do the canine canine = new canine(); bit so that canine is a
child of animal - but I can't get CANINE to access the properties of
animal.

Thanks

Daz

[Nate]

This is definitely the correct approach. Canine should be derived from
Animal. Its not a child of Animal, its a specialization of Animal.

So if...

public class Animal
{
public int weight;
public int height;
}

public class Canine : Animal
{
public int teeth;
}

Canine dog = new Canine();
Console.WriteLi ne(dog.weight);

// polymorphism in effect...
Animal animal = new Canine();
Canine dog2 = (Canine)animal;
"TheSteph" wrote:

Can you post some code ???

Do you dervie Canine from Animal ?

class Canine : Animal
{

}
Steph.
<Da************ **@gmail.com> wrote in message
news:11******** **************@ g10g2000cwb.goo glegroups.com.. .

Hi guys

Posted what was probably a rather confusing post about this the other
day, so I am going to have another go and see if I can make more sense.
This sis purely a

I've got a base class called animal, and from within animal you can
access lots more classes such as feline, canine, reptile and
amphibian.....

To access canine, you are going to go through animal. Animal has lots
of public properties such as height and weight that we can access from
our aspx.

So first of all I want to do animal.configur e(iHeight, iWeight).....

Inside canine, I would like to be able to access the properties of the
animal object, so i can find out how big it is, how tall it is etc etc
- does that make sense?

I can do the canine canine = new canine(); bit so that canine is a
child of animal - but I can't get animal to access the properties of
animal.

Can you help?? Awaiting you is my eternal gratitude ;)

Many thanks

Darren

[Darren.Ratcliffe]

Yes Steph

Basically, Canine belongs to Animal.

So, inside Canine, I want to be able to access properties of Animal.

For example:

class Animal
{
// Declare the child object (I presume this is correct)
Canine Canine = new Canine();

public string sName = "Rex";
}

Class Canine
{
Public String myFunc()
{
return Animal.Name + " is our returned value"
}

}

Thanks very much for your help.

Darren

[Darren.Ratcliffe]

Hi Ignacio

Thanks for trying to help!

I have posted a code snipped in reply to Stephs reply - please could
you take a look at it there?

Many many thanks.

Darren :)

[Marc Gravell]

What you are trying to do is presumably inheritance, not encapsulation; to
give a more complete example:

Marc

======

using System;

static class Program {
static void Main() {
Canine rex = new Canine();
rex.Name = "Rex";
Console.WriteLi ne("Rex speaking: " + rex.Speak()); // use the method
inherited from all animals
Console.WriteLi ne("Rex barking: " + rex.Bark()); // use the
canine-specific method
Animal animal = rex; // note that this does *NOT* create a new
object -
// we are still looking at the same rex, but just using the generic
animal API
Console.WriteLi ne("Animal speaking: " + animal.Speak()) ;
Console.ReadLin e();
}
}

abstract class Animal { // abstract: doesn't declare a concrete (creatable)
type - but only a base class
private string _name;
public string Name {get {return _name;} set {_name = value;}}
public abstract string Speak(); // force all Animal types to provide
this
}

class Canine : Animal {
public string Bark() { // this method is specific to Canine objects
return Name + " says \"Woof\"";
}
public override string Speak() {
return Bark();
}
}

[Darren.Ratcliffe]

Hi Marc, and to everyone else.

Well, after a good hour and a half of brushing up on OOP with Pro C#
2005 and the .NET 2.0 Platform (Apress) that I bought, I have got it.

What I want to do is set up my child class (canine) as Canine:Animal.

Then, I can access the protected properties of animal from within
canine by doing this.AnimalProp erty.

Now I know that, even I think I sounded stupid before ;)

Many thanks for all your help - it is appreciated :)