Inheritance question

[Taylor]

I'm trying to understand inheritance. I'd like to make my own type of
IPAddress lets call it myIp.

The following gives me CS0029 error: Cannot implicitly convert type
'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'

Could you steer me in the right direction?
class myIp : System.Net.IPAd dress
{
private IPAddress ip;

public myIp(long l) : base(l)
{
this.ip = new IPAddress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1");
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}

[Michael Culley]

try change

private IPAddress ip; to private System.Net.IPAd dress ip;
and the same for new IPAddress(l);

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message news:#e******** ******@TK2MSFTN GP12.phx.gbl... I'm trying to understand inheritance. I'd like to make my own type of
IPAddress lets call it myIp.

The following gives me CS0029 error: Cannot implicitly convert type
'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'

Could you steer me in the right direction?
class myIp : System.Net.IPAd dress
{
private IPAddress ip;

public myIp(long l) : base(l)
{
this.ip = new IPAddress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1");
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}

[Taylor]

Thanks for the suggestion Michael, but the same error occurs when I supply
the full name for IPAddress. Here is what I have now, but same error.

class myIp : System.Net.IPAd dress
{
private System.Net.IPAd dress ip;

public myIp(long l) : base(l)
{
this.ip = new System.Net.IPAd dress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}
"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:e2******** ******@TK2MSFTN GP11.phx.gbl...

try change

private IPAddress ip;

to

private System.Net.IPAd dress ip;

and the same for new IPAddress(l);

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message

news:#e******** ******@TK2MSFTN GP12.phx.gbl...

I'm trying to understand inheritance. I'd like to make my own type of
IPAddress lets call it myIp.

The following gives me CS0029 error: Cannot implicitly convert type
'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'

Could you steer me in the right direction?
class myIp : System.Net.IPAd dress
{
private IPAddress ip;

public myIp(long l) : base(l)
{
this.ip = new IPAddress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1");
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}

[Michael Culley]

Ah, now I see the problem. The Parse function still returns an IPAddress, not a myIp. You need to add this code to your myIp class.

public static new myIp Parse(string ipString)
{
myIp x = new myIp(0);
x.ip = System.Net.IPAd dress.Parse(ipS tring);
return x;
}

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message news:Oz******** *****@tk2msftng p13.phx.gbl...

Thanks for the suggestion Michael, but the same error occurs when I supply
the full name for IPAddress. Here is what I have now, but same error.

class myIp : System.Net.IPAd dress
{
private System.Net.IPAd dress ip;

public myIp(long l) : base(l)
{
this.ip = new System.Net.IPAd dress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}
"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:e2******** ******@TK2MSFTN GP11.phx.gbl...

try change

private IPAddress ip;

to

private System.Net.IPAd dress ip;

and the same for new IPAddress(l);

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message

news:#e******** ******@TK2MSFTN GP12.phx.gbl...

I'm trying to understand inheritance. I'd like to make my own type of
IPAddress lets call it myIp.

The following gives me CS0029 error: Cannot implicitly convert type
'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'

Could you steer me in the right direction?
class myIp : System.Net.IPAd dress
{
private IPAddress ip;

public myIp(long l) : base(l)
{
this.ip = new IPAddress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1");
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}

[Taylor]

Hi Michael,

You've have made me a very happy camper! Thank you, Thank you! Finally
I've entered the OO world, this was my first inheritance. I'm much richer
now! I will study it further. You can tell I've spent some time staring at
this one by how incredibly pleased I am!

I really appreciate your sticking with me on this one!

Thanks Michael,
Taylor

"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:uK******** ******@TK2MSFTN GP11.phx.gbl...

Ah, now I see the problem. The Parse function still returns an IPAddress, not a myIp. You need to add this code to your myIp class.
public static new myIp Parse(string ipString)
{
myIp x = new myIp(0);
x.ip = System.Net.IPAd dress.Parse(ipS tring);
return x;
}

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message

news:Oz******** *****@tk2msftng p13.phx.gbl...

Thanks for the suggestion Michael, but the same error occurs when I supply the full name for IPAddress. Here is what I have now, but same error.

class myIp : System.Net.IPAd dress
{
private System.Net.IPAd dress ip;

public myIp(long l) : base(l)
{
this.ip = new System.Net.IPAd dress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}
"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:e2******** ******@TK2MSFTN GP11.phx.gbl...

try change
> private IPAddress ip;
to
> private System.Net.IPAd dress ip;

and the same for new IPAddress(l);

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message

news:#e******** ******@TK2MSFTN GP12.phx.gbl...

> I'm trying to understand inheritance. I'd like to make my own type of > IPAddress lets call it myIp.
>
> The following gives me CS0029 error: Cannot implicitly convert type
> 'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'
>
> Could you steer me in the right direction?
>
>
> class myIp : System.Net.IPAd dress
> {
> private IPAddress ip;
>
> public myIp(long l) : base(l)
> {
> this.ip = new IPAddress(l);
> }
>
>
> [STAThread]
> static void Main(string[] args)
> {
> myIp t = myIp.Parse("127 .0.0.1");
> byte[] bts = t.GetAddressByt es();
> foreach(byte b in bts)
> {
> Console.WriteLi ne(b.ToString() );
> }
>
> }
> }
>
>
>
>

[Brian W]

Sure, you can get this to work, but, in this situation, more importantly
why?

You have myIp that derive from IPAddress.

myIp has a field (member) of type IPAddress

you are constructing an instance of myIp by passing l

you are then creating and instance of IPAddress using l and assigning that
to the member ip.

since myIp _IS_ a IPAddress you now have 2 instances that represent the same
IP.

(did that make any sense?)
Good luck!
Brian W



"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:eB******** ******@TK2MSFTN GP09.phx.gbl...

Hi Michael,

You've have made me a very happy camper! Thank you, Thank you! Finally
I've entered the OO world, this was my first inheritance. I'm much richer
now! I will study it further. You can tell I've spent some time staring at this one by how incredibly pleased I am!

I really appreciate your sticking with me on this one!

Thanks Michael,
Taylor

"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:uK******** ******@TK2MSFTN GP11.phx.gbl...

Ah, now I see the problem. The Parse function still returns an IPAddress,

not a myIp. You need to add this code to your myIp class.

public static new myIp Parse(string ipString)
{
myIp x = new myIp(0);
x.ip = System.Net.IPAd dress.Parse(ipS tring);
return x;
}

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message news:Oz******** *****@tk2msftng p13.phx.gbl... Thanks for the suggestion Michael, but the same error occurs when I supply the full name for IPAddress. Here is what I have now, but same error.

class myIp : System.Net.IPAd dress
{
private System.Net.IPAd dress ip;

public myIp(long l) : base(l)
{
this.ip = new System.Net.IPAd dress(l);
}
[STAThread]
static void Main(string[] args)
{
myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
byte[] bts = t.GetAddressByt es();
foreach(byte b in bts)
{
Console.WriteLi ne(b.ToString() );
}

}
}
"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:e2******** ******@TK2MSFTN GP11.phx.gbl...
> try change
> > private IPAddress ip;
> to
> > private System.Net.IPAd dress ip;
>
> and the same for new IPAddress(l);
>
> --
> Michael Culley
>
>
> "Taylor" <ta****@u.washi ngton.edu> wrote in message
news:#e******** ******@TK2MSFTN GP12.phx.gbl...
> > I'm trying to understand inheritance. I'd like to make my own type of

> > IPAddress lets call it myIp.
> >
> > The following gives me CS0029 error: Cannot implicitly convert

type > > 'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'
> >
> > Could you steer me in the right direction?
> >
> >
> > class myIp : System.Net.IPAd dress
> > {
> > private IPAddress ip;
> >
> > public myIp(long l) : base(l)
> > {
> > this.ip = new IPAddress(l);
> > }
> >
> >
> > [STAThread]
> > static void Main(string[] args)
> > {
> > myIp t = myIp.Parse("127 .0.0.1");
> > byte[] bts = t.GetAddressByt es();
> > foreach(byte b in bts)
> > {
> > Console.WriteLi ne(b.ToString() );
> > }
> >
> > }
> > }
> >
> >
> >
> >
>
>

[Taylor]

Good point. Hmmmm.... I'm trying to get this right... This shouldn't be so
hard, but I'm just not getting the right combination. This next attempt
doesn't work either because the an implicit conversion from a myIp to a
System.Net.IPAd dress is not possible. I've tried to make an explicit
conversion, but I can't seem to get it right.
namespace test
{
using System;
using System.Net;

class myIp : System.Net.IPAd dress
{
private System.Net.IPAd dress ip;
public myIp(long l)
: base(l)
{

}
}

class TestMyIP
{
[STAThread]
static void Main(string[] args)
{
myIp ip = myIp.Parse("127 .0.0.1");

Console.WriteLi ne(ip.ToString( ));
}
}
}



"Brian W" <brianw@gold_de ath_2_spam_rush .com> wrote in message
news:e6******** *****@tk2msftng p13.phx.gbl...

Sure, you can get this to work, but, in this situation, more importantly
why?

You have myIp that derive from IPAddress.

myIp has a field (member) of type IPAddress

you are constructing an instance of myIp by passing l

you are then creating and instance of IPAddress using l and assigning that
to the member ip.

since myIp _IS_ a IPAddress you now have 2 instances that represent the same IP.

(did that make any sense?)
Good luck!
Brian W



"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:eB******** ******@TK2MSFTN GP09.phx.gbl...

Hi Michael,

You've have made me a very happy camper! Thank you, Thank you! Finally
I've entered the OO world, this was my first inheritance. I'm much richer

now! I will study it further. You can tell I've spent some time

staring at

this one by how incredibly pleased I am!

I really appreciate your sticking with me on this one!

Thanks Michael,
Taylor

"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:uK******** ******@TK2MSFTN GP11.phx.gbl...

Ah, now I see the problem. The Parse function still returns an

IPAddress,

not a myIp. You need to add this code to your myIp class.

public static new myIp Parse(string ipString)
{
myIp x = new myIp(0);
x.ip = System.Net.IPAd dress.Parse(ipS tring);
return x;
}

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message

news:Oz******** *****@tk2msftng p13.phx.gbl...

> Thanks for the suggestion Michael, but the same error occurs when I

supply

> the full name for IPAddress. Here is what I have now, but same error. >
> class myIp : System.Net.IPAd dress
> {
> private System.Net.IPAd dress ip;
>
> public myIp(long l) : base(l)
> {
> this.ip = new System.Net.IPAd dress(l);
> }
>
>
> [STAThread]
> static void Main(string[] args)
> {
> myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
> byte[] bts = t.GetAddressByt es();
> foreach(byte b in bts)
> {
> Console.WriteLi ne(b.ToString() );
> }
>
> }
> }
>
>
> "Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
> news:e2******** ******@TK2MSFTN GP11.phx.gbl...
> > try change
> > > private IPAddress ip;
> > to
> > > private System.Net.IPAd dress ip;
> >
> > and the same for new IPAddress(l);
> >
> > --
> > Michael Culley
> >
> >
> > "Taylor" <ta****@u.washi ngton.edu> wrote in message
> news:#e******** ******@TK2MSFTN GP12.phx.gbl...
> > > I'm trying to understand inheritance. I'd like to make my own

type

of

> > > IPAddress lets call it myIp.
> > >
> > > The following gives me CS0029 error: Cannot implicitly convert

type > > > 'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'
> > >
> > > Could you steer me in the right direction?
> > >
> > >
> > > class myIp : System.Net.IPAd dress
> > > {
> > > private IPAddress ip;
> > >
> > > public myIp(long l) : base(l)
> > > {
> > > this.ip = new IPAddress(l);
> > > }
> > >
> > >
> > > [STAThread]
> > > static void Main(string[] args)
> > > {
> > > myIp t = myIp.Parse("127 .0.0.1");
> > > byte[] bts = t.GetAddressByt es();
> > > foreach(byte b in bts)
> > > {
> > > Console.WriteLi ne(b.ToString() );
> > > }
> > >
> > > }
> > > }
> > >
> > >
> > >
> > >
> >
> >
>
>

[Taylor]

I'm thinking that my problem is similar to this one:
http://www.dotnet247.com/247referenc...25/126903.aspx
<quote>
The problem with all-static classes is that when you
derive from them, you can't override or 'new' the methods.

If you cast DerivedClass to BaseClass and call
MethodOne(), it'll call BaseClass.Metho dOne() instead of
DerivedClass.Me thodOne(), even though it's really
a DerivedClass to begin with.
</quote>

Going on this advice I'm reduced to only being able to create a BaseClass
IPAddress object, right? Going off advice in the above url I find that I
can do this:

IPAddress ip = myIp.Parse("127 .0.0.1");

but does that mean that I'm reduced to never bing able to create an instance
of myIp? I can only then call static methods?

Need I go searching on how to create an abstract factory class similar to
what they're talking about in the above url?

Taylor


"Brian W" <brianw@gold_de ath_2_spam_rush .com> wrote in message
news:e6******** *****@tk2msftng p13.phx.gbl...

Sure, you can get this to work, but, in this situation, more importantly
why?

You have myIp that derive from IPAddress.

myIp has a field (member) of type IPAddress

you are constructing an instance of myIp by passing l

you are then creating and instance of IPAddress using l and assigning that
to the member ip.

since myIp _IS_ a IPAddress you now have 2 instances that represent the same IP.

(did that make any sense?)
Good luck!
Brian W



"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:eB******** ******@TK2MSFTN GP09.phx.gbl...

Hi Michael,

You've have made me a very happy camper! Thank you, Thank you! Finally
I've entered the OO world, this was my first inheritance. I'm much richer

now! I will study it further. You can tell I've spent some time

staring at

this one by how incredibly pleased I am!

I really appreciate your sticking with me on this one!

Thanks Michael,
Taylor

"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:uK******** ******@TK2MSFTN GP11.phx.gbl...

Ah, now I see the problem. The Parse function still returns an

IPAddress,

not a myIp. You need to add this code to your myIp class.

public static new myIp Parse(string ipString)
{
myIp x = new myIp(0);
x.ip = System.Net.IPAd dress.Parse(ipS tring);
return x;
}

--
Michael Culley
"Taylor" <ta****@u.washi ngton.edu> wrote in message

news:Oz******** *****@tk2msftng p13.phx.gbl...

> Thanks for the suggestion Michael, but the same error occurs when I

supply

> the full name for IPAddress. Here is what I have now, but same error. >
> class myIp : System.Net.IPAd dress
> {
> private System.Net.IPAd dress ip;
>
> public myIp(long l) : base(l)
> {
> this.ip = new System.Net.IPAd dress(l);
> }
>
>
> [STAThread]
> static void Main(string[] args)
> {
> myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
> byte[] bts = t.GetAddressByt es();
> foreach(byte b in bts)
> {
> Console.WriteLi ne(b.ToString() );
> }
>
> }
> }
>
>
> "Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
> news:e2******** ******@TK2MSFTN GP11.phx.gbl...
> > try change
> > > private IPAddress ip;
> > to
> > > private System.Net.IPAd dress ip;
> >
> > and the same for new IPAddress(l);
> >
> > --
> > Michael Culley
> >
> >
> > "Taylor" <ta****@u.washi ngton.edu> wrote in message
> news:#e******** ******@TK2MSFTN GP12.phx.gbl...
> > > I'm trying to understand inheritance. I'd like to make my own

type

of

> > > IPAddress lets call it myIp.
> > >
> > > The following gives me CS0029 error: Cannot implicitly convert

type > > > 'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'
> > >
> > > Could you steer me in the right direction?
> > >
> > >
> > > class myIp : System.Net.IPAd dress
> > > {
> > > private IPAddress ip;
> > >
> > > public myIp(long l) : base(l)
> > > {
> > > this.ip = new IPAddress(l);
> > > }
> > >
> > >
> > > [STAThread]
> > > static void Main(string[] args)
> > > {
> > > myIp t = myIp.Parse("127 .0.0.1");
> > > byte[] bts = t.GetAddressByt es();
> > > foreach(byte b in bts)
> > > {
> > > Console.WriteLi ne(b.ToString() );
> > > }
> > >
> > > }
> > > }
> > >
> > >
> > >
> > >
> >
> >
>
>

[Brian W]

Well, firstly, IPAddress isn't a static class. Parse is a static method and
this

Perhaps you need to pick up a book on OO design and/or programming. Reading
such a book is certainly better, not to mention more productive, than just
jumping in head first.

In addition, you may want to try something simpler.

In this case if you really want to derive from IPAddress the following
should be what you are looking for. Note that myIp has not member of type
IPAddress. Also note the cast from IPAddress to myIp.

In this specific example there really is not reason for this constructor.
the default constructor would suffice.

namespace ConsoleApplicat ion1
{

class myIp : System.Net.IPAd dress
{

public myIp(long l) : base(l)
{
}
}
/// <summary>
/// Summary description for Class1.
/// </summary>
///
class Class1
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{

// Just cast it.
myIp ip = (myIp)myIp.Pars e("127.0.0.1" );

//
// TODO: Add code to start application here
//
}
}
}


"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:O5******** *****@TK2MSFTNG P11.phx.gbl...

I'm thinking that my problem is similar to this one:
http://www.dotnet247.com/247referenc...25/126903.aspx
<quote>
The problem with all-static classes is that when you
derive from them, you can't override or 'new' the methods.

If you cast DerivedClass to BaseClass and call
MethodOne(), it'll call BaseClass.Metho dOne() instead of
DerivedClass.Me thodOne(), even though it's really
a DerivedClass to begin with.
</quote>

Going on this advice I'm reduced to only being able to create a BaseClass
IPAddress object, right? Going off advice in the above url I find that I
can do this:

IPAddress ip = myIp.Parse("127 .0.0.1");

but does that mean that I'm reduced to never bing able to create an instance of myIp? I can only then call static methods?

Need I go searching on how to create an abstract factory class similar to
what they're talking about in the above url?

Taylor


"Brian W" <brianw@gold_de ath_2_spam_rush .com> wrote in message
news:e6******** *****@tk2msftng p13.phx.gbl...

Sure, you can get this to work, but, in this situation, more importantly
why?

You have myIp that derive from IPAddress.

myIp has a field (member) of type IPAddress

you are constructing an instance of myIp by passing l

you are then creating and instance of IPAddress using l and assigning that

to the member ip.

since myIp _IS_ a IPAddress you now have 2 instances that represent the

same

IP.

(did that make any sense?)
Good luck!
Brian W



"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:eB******** ******@TK2MSFTN GP09.phx.gbl...

Hi Michael,

You've have made me a very happy camper! Thank you, Thank you! Finally I've entered the OO world, this was my first inheritance. I'm much

richer now! I will study it further. You can tell I've spent some time staring

at

this one by how incredibly pleased I am!

I really appreciate your sticking with me on this one!

Thanks Michael,
Taylor

"Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
news:uK******** ******@TK2MSFTN GP11.phx.gbl...
> Ah, now I see the problem. The Parse function still returns an

IPAddress,

not a myIp. You need to add this code to your myIp class.
>
> public static new myIp Parse(string ipString)
> {
> myIp x = new myIp(0);
> x.ip = System.Net.IPAd dress.Parse(ipS tring);
> return x;
> }
>
> --
> Michael Culley
>
>
> "Taylor" <ta****@u.washi ngton.edu> wrote in message
news:Oz******** *****@tk2msftng p13.phx.gbl...
> > Thanks for the suggestion Michael, but the same error occurs when I supply
> > the full name for IPAddress. Here is what I have now, but same

error. > >
> > class myIp : System.Net.IPAd dress
> > {
> > private System.Net.IPAd dress ip;
> >
> > public myIp(long l) : base(l)
> > {
> > this.ip = new System.Net.IPAd dress(l);
> > }
> >
> >
> > [STAThread]
> > static void Main(string[] args)
> > {
> > myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
> > byte[] bts = t.GetAddressByt es();
> > foreach(byte b in bts)
> > {
> > Console.WriteLi ne(b.ToString() );
> > }
> >
> > }
> > }
> >
> >
> > "Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
> > news:e2******** ******@TK2MSFTN GP11.phx.gbl...
> > > try change
> > > > private IPAddress ip;
> > > to
> > > > private System.Net.IPAd dress ip;
> > >
> > > and the same for new IPAddress(l);
> > >
> > > --
> > > Michael Culley
> > >
> > >
> > > "Taylor" <ta****@u.washi ngton.edu> wrote in message
> > news:#e******** ******@TK2MSFTN GP12.phx.gbl...
> > > > I'm trying to understand inheritance. I'd like to make my own

type

of
> > > > IPAddress lets call it myIp.
> > > >
> > > > The following gives me CS0029 error: Cannot implicitly convert

type

> > > > 'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'
> > > >
> > > > Could you steer me in the right direction?
> > > >
> > > >
> > > > class myIp : System.Net.IPAd dress
> > > > {
> > > > private IPAddress ip;
> > > >
> > > > public myIp(long l) : base(l)
> > > > {
> > > > this.ip = new IPAddress(l);
> > > > }
> > > >
> > > >
> > > > [STAThread]
> > > > static void Main(string[] args)
> > > > {
> > > > myIp t = myIp.Parse("127 .0.0.1");
> > > > byte[] bts = t.GetAddressByt es();
> > > > foreach(byte b in bts)
> > > > {
> > > > Console.WriteLi ne(b.ToString() );
> > > > }
> > > >
> > > > }
> > > > }
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>

[Taylor]

Hi Brian,

I tried your code, but it produced an InvalidCastExce ption.

Taylor
"Brian W" <brianw@gold_de ath_2_spam_rush .com> wrote in message
news:eD******** *****@TK2MSFTNG P10.phx.gbl...

Well, firstly, IPAddress isn't a static class. Parse is a static method and this

Perhaps you need to pick up a book on OO design and/or programming. Reading such a book is certainly better, not to mention more productive, than just
jumping in head first.

In addition, you may want to try something simpler.

In this case if you really want to derive from IPAddress the following
should be what you are looking for. Note that myIp has not member of type
IPAddress. Also note the cast from IPAddress to myIp.

In this specific example there really is not reason for this constructor.
the default constructor would suffice.

namespace ConsoleApplicat ion1
{

class myIp : System.Net.IPAd dress
{

public myIp(long l) : base(l)
{
}
}
/// <summary>
/// Summary description for Class1.
/// </summary>
///
class Class1
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{

// Just cast it.
myIp ip = (myIp)myIp.Pars e("127.0.0.1" );

//
// TODO: Add code to start application here
//
}
}
}


"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:O5******** *****@TK2MSFTNG P11.phx.gbl...

I'm thinking that my problem is similar to this one:
http://www.dotnet247.com/247referenc...25/126903.aspx
<quote>
The problem with all-static classes is that when you
derive from them, you can't override or 'new' the methods.

If you cast DerivedClass to BaseClass and call
MethodOne(), it'll call BaseClass.Metho dOne() instead of
DerivedClass.Me thodOne(), even though it's really
a DerivedClass to begin with.
</quote>

Going on this advice I'm reduced to only being able to create a BaseClass

IPAddress object, right? Going off advice in the above url I find that I can do this:

IPAddress ip = myIp.Parse("127 .0.0.1");

but does that mean that I'm reduced to never bing able to create an instance

of myIp? I can only then call static methods?

Need I go searching on how to create an abstract factory class similar to what they're talking about in the above url?

Taylor


"Brian W" <brianw@gold_de ath_2_spam_rush .com> wrote in message
news:e6******** *****@tk2msftng p13.phx.gbl...

Sure, you can get this to work, but, in this situation, more importantly why?

You have myIp that derive from IPAddress.

myIp has a field (member) of type IPAddress

you are constructing an instance of myIp by passing l

you are then creating and instance of IPAddress using l and assigning that to the member ip.

since myIp _IS_ a IPAddress you now have 2 instances that represent the same

IP.

(did that make any sense?)
Good luck!
Brian W



"Taylor" <ta****@u.washi ngton.edu> wrote in message
news:eB******** ******@TK2MSFTN GP09.phx.gbl...
> Hi Michael,
>
> You've have made me a very happy camper! Thank you, Thank you! Finally > I've entered the OO world, this was my first inheritance. I'm much

richer

> now! I will study it further. You can tell I've spent some time

staring

at
> this one by how incredibly pleased I am!
>
> I really appreciate your sticking with me on this one!
>
> Thanks Michael,
> Taylor
>
>
>
>
>
> "Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in message
> news:uK******** ******@TK2MSFTN GP11.phx.gbl...
> > Ah, now I see the problem. The Parse function still returns an
IPAddress,
> not a myIp. You need to add this code to your myIp class.
> >
> > public static new myIp Parse(string ipString)
> > {
> > myIp x = new myIp(0);
> > x.ip = System.Net.IPAd dress.Parse(ipS tring);
> > return x;
> > }
> >
> > --
> > Michael Culley
> >
> >
> > "Taylor" <ta****@u.washi ngton.edu> wrote in message
> news:Oz******** *****@tk2msftng p13.phx.gbl...
> > > Thanks for the suggestion Michael, but the same error occurs

when I > supply
> > > the full name for IPAddress. Here is what I have now, but same

error.

> > >
> > > class myIp : System.Net.IPAd dress
> > > {
> > > private System.Net.IPAd dress ip;
> > >
> > > public myIp(long l) : base(l)
> > > {
> > > this.ip = new System.Net.IPAd dress(l);
> > > }
> > >
> > >
> > > [STAThread]
> > > static void Main(string[] args)
> > > {
> > > myIp t = myIp.Parse("127 .0.0.1"); // ---->error here
> > > byte[] bts = t.GetAddressByt es();
> > > foreach(byte b in bts)
> > > {
> > > Console.WriteLi ne(b.ToString() );
> > > }
> > >
> > > }
> > > }
> > >
> > >
> > > "Michael Culley" <mc*****@NOSPAM optushome.com.a u> wrote in

message > > > news:e2******** ******@TK2MSFTN GP11.phx.gbl...
> > > > try change
> > > > > private IPAddress ip;
> > > > to
> > > > > private System.Net.IPAd dress ip;
> > > >
> > > > and the same for new IPAddress(l);
> > > >
> > > > --
> > > > Michael Culley
> > > >
> > > >
> > > > "Taylor" <ta****@u.washi ngton.edu> wrote in message
> > > news:#e******** ******@TK2MSFTN GP12.phx.gbl...
> > > > > I'm trying to understand inheritance. I'd like to make my own type
> of
> > > > > IPAddress lets call it myIp.
> > > > >
> > > > > The following gives me CS0029 error: Cannot implicitly convert type
> > > > > 'System.Net.IPA ddress' to 'Inheritance_Te sting.myIp'
> > > > >
> > > > > Could you steer me in the right direction?
> > > > >
> > > > >
> > > > > class myIp : System.Net.IPAd dress
> > > > > {
> > > > > private IPAddress ip;
> > > > >
> > > > > public myIp(long l) : base(l)
> > > > > {
> > > > > this.ip = new IPAddress(l);
> > > > > }
> > > > >
> > > > >
> > > > > [STAThread]
> > > > > static void Main(string[] args)
> > > > > {
> > > > > myIp t = myIp.Parse("127 .0.0.1");
> > > > > byte[] bts = t.GetAddressByt es();
> > > > > foreach(byte b in bts)
> > > > > {
> > > > > Console.WriteLi ne(b.ToString() );
> > > > > }
> > > > >
> > > > > }
> > > > > }
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>