Can I write as follow?

[ABC]

interface IWebPage
{
class SessionStructure {};
void SaveSession();
void LoadSession();
}

public class BasePage : IWebPage
{
class SessionStructure
{
int a;
int b;
}

void SaveSession() { ............. };
void LoadSession() { ............. };
}

[Nicholas Paldino [.NET/C# MVP]]

Well, there are a few problems here.

The first is that you should make the Save and LoadSession methods on
the BasePage class virtual, so that they can be overridden by derived
classes.

However, you can not extend the SessionStructure class like that. You
would have to create a new type.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"ABC" <ab*@abc.com> wrote in message
news:Oh**************@TK2MSFTNGP10.phx.gbl...

interface IWebPage
{
class SessionStructure {};
void SaveSession();
void LoadSession();
}

public class BasePage : IWebPage
{
class SessionStructure
{
int a;
int b;
}

void SaveSession() { ............. };
void LoadSession() { ............. };
}

[KJ]

No. As the compiler will tell you, interfaces cannot declare types.
Perhaps you might share why you want to do this, so alternatives may be
offered.

[ABC]

What alternatives can do similar case?
"KJ" <n_**********@mail.com> wrote in message
news:11**********************@g44g2000cwa.googlegr oups.com...

No. As the compiler will tell you, interfaces cannot declare types.
Perhaps you might share why you want to do this, so alternatives may be
offered.

[Jon Skeet [C# MVP]]

ABC <ab*@abc.com> wrote:

What alternatives can do similar case?

We need to know what you're actually trying to do before we can answer
that. It's not at all obvious how you expected to be able to use that
interface.

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

[Mark Rae]

"ABC" <ab*@abc.com> wrote in message
news:Ob*************@TK2MSFTNGP11.phx.gbl...

What alternatives can do similar case?

What are you actually trying to do...?

[ABC]

as each webpage has difference session structure to hold data, but each
webpage have similar behaviors to load and save session data to sessions
pool. I want to standardize the programmers coding, so the interface should
have a base session class and programmers should do some codes to add
properties to session structures, all programmers must use same session
structure name. I don't like they have own programming styles.

"Jon Skeet [C# MVP]" <sk***@pobox.com> wrote in message
news:MP************************@msnews.microsoft.c om...

ABC <ab*@abc.com> wrote:

What alternatives can do similar case?

We need to know what you're actually trying to do before we can answer
that. It's not at all obvious how you expected to be able to use that
interface.

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

[Jon Skeet [C# MVP]]

ABC <ab*@abc.com> wrote:

as each webpage has difference session structure to hold data, but each
webpage have similar behaviors to load and save session data to sessions
pool. I want to standardize the programmers coding, so the interface should
have a base session class and programmers should do some codes to add
properties to session structures, all programmers must use same session
structure name. I don't like they have own programming styles.

No, you can't enforce naming like this. (Nor would the interface be
expressing anything you could actually *use* given only a reference to
an instance of the interface.) I can't see how it's agood idea though
anyway - it would make things very awkward if you had two web pages
which actually needed the same session structure. They'd have to
declare the same thing twice, which is bad practice.

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

[KJ]

Have you considered using inheritance, or a combination of inheritance
and delegation?