Using inheritance for web pages - why have a Page_Init when you can override OnInit?

I'm trying to better understand the use of inheritance vs. the
implementation of a handler. I wanted to ask this question to the newsgroup.

Each aspx page is a class which Inherits System.Web.UI.Page.
Then, each page has it's own implementation of Private Sub Page_Load and
Private Sub Page_Init to handle the Handles MyBase.Load and Handles
MyBase.Init events (respectively). The programmer (you or me) is supposed to
flesh out the Pgae_Load and, if you are using the Visual Studio designer,
not touch the Page_Init event handlers.

Instead of this, why don't these page classes, which are subclasses of
System.Web.UI.Page just overload the superclasses of the OnInit and OnLoad
classes? That would seem to make more sense from a class hierarchy
standpoint. Each page class, for example

'Instead of this:

Public Class WebForm1

Inherits System.Web.UI.Page

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here

End Sub

End Class

'Do this:

Public Class WebForm1

Inherits System.Web.UI.Page

Protected Overrides Sub OnInit(ByVal e As EventArgs)

'Put user code to initialize the page here

MyBase.OnLoad(e)

End Sub 'OnInit

End Class

Sorry, I mixed up the code- reposting with correct example now :)

I'm trying to better understand the use of inheritance vs. the
implementation of a handler. I wanted to ask this question to the newsgroup.

Each aspx page is a class which Inherits System.Web.UI.Page. Then, each page
has it's own implementation of Private Sub Page_Load and Private Sub
Page_Init to handle the Handles MyBase.Load and Handles MyBase.Init events
(respectively). The programmer (you or me) is supposed to flesh out the
Pgae_Load and, if you are using the Visual Studio designer, not touch the
Page_Init event handlers.

Instead of this, why don't these page classes, which are subclasses of
System.Web.UI.Page just overload the superclasses of the OnInit and OnLoad
classes? That would seem to make more sense from a class hierarchy
standpoint. Each page class, for example

'Instead of this:

Public Class WebForm1

Inherits System.Web.UI.Page

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here

End Sub

End Class

'Do this:

Public Class WebForm1

Inherits System.Web.UI.Page

Protected Overrides Sub OnLoad(ByVal e As EventArgs)

'Put user code to initialize the page here

MyBase.OnLoad(e)

End Sub 'OnInit

End Class

[Ben]

Totally agree. So the VB.NET code generation does it as well as the C#.
I get rid of them and override the base classes method as I would in any
other class.
You don't see people adding a handler for OnPreRender, you override don't
you.
I think who ever was writing the code generator was just being silly.

Ben W

PS Remember to call the base though



<DanR@REMOVETHISTOGETTOME-warshawgroup.com> wrote in message
news:OhhgCzlRDHA.2152@TK2MSFTNGP12.phx.gbl...

> Sorry, I mixed up the code- reposting with correct example now :)
>
> I'm trying to better understand the use of inheritance vs. the
> implementation of a handler. I wanted to ask this question to the

newsgroup.

>
> Each aspx page is a class which Inherits System.Web.UI.Page. Then, each

page

> has it's own implementation of Private Sub Page_Load and Private Sub
> Page_Init to handle the Handles MyBase.Load and Handles MyBase.Init

events

> (respectively). The programmer (you or me) is supposed to flesh out the
> Pgae_Load and, if you are using the Visual Studio designer, not touch the
> Page_Init event handlers.
>
> Instead of this, why don't these page classes, which are subclasses of
> System.Web.UI.Page just overload the superclasses of the OnInit and OnLoad
> classes? That would seem to make more sense from a class hierarchy
> standpoint. Each page class, for example
>
> 'Instead of this:
>
> Public Class WebForm1
>
> Inherits System.Web.UI.Page
>
> Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
> System.EventArgs) Handles MyBase.Load
>
> 'Put user code to initialize the page here
>
> End Sub
>
> End Class
>
> 'Do this:
>
> Public Class WebForm1
>
> Inherits System.Web.UI.Page
>
> Protected Overrides Sub OnLoad(ByVal e As EventArgs)
>
> 'Put user code to initialize the page here
>
> MyBase.OnLoad(e)
>
> End Sub 'OnInit
>
> End Class
>
>
>

[Ben]

Disagree,

As the author of the class you should just sequence the code correctly on
the overridden OnLoad method!

It is actually going against MSs own guidelines to attach an event handler
for the same class that is raising the event.

Ben

"Natty Gur" <natty@dao2com.com> wrote in message
news:uK33iNrRDHA.2460@TK2MSFTNGP10.phx.gbl...

> Hi,
>
> You can override Onload function but OnLoad() is call by the framework
> every time the page is loaded. But before the Page_Load() method is
> called in your code-behind page. This allows you to do some action
> before Page_load runs and the programmer code in the page_load executes,
> such as security checking.
>
>
> Natty Gur, CTO
> Dao2Com Ltd.
> 28th Baruch Hirsch st. Bnei-Brak
> Israel , 51114
>
> Phone Numbers:
> Office: +972-(0)3-5786668
> Fax: +972-(0)3-5703475
> Mobile: +972-(0)58-888377
>
> Know the overall picture
>
>
> *** Sent via Developersdex [url]http://www.developersdex.com[/url] ***
> Don't just participate in USENET...get rewarded for it!

[Natty Gur]

but, he is the user...

Natty Gur, CTO
Dao2Com Ltd.
28th Baruch Hirsch st. Bnei-Brak
Israel , 51114

Phone Numbers:
Office: +972-(0)3-5786668
Fax: +972-(0)3-5703475
Mobile: +972-(0)58-888377

Know the overall picture


*** Sent via Developersdex [url]http://www.developersdex.com[/url] ***
Don't just participate in USENET...get rewarded for it!

Hey, if you see this, drop me an email.
I think you will figure out how.
-Rz
I like your return address. LOL


"Ben" <mustbejoking@120spamsaday.con> wrote in message
news:uFbIw4mRDHA.1896@TK2MSFTNGP12.phx.gbl...

> Totally agree. So the VB.NET code generation does it as well as the C#.
> I get rid of them and override the base classes method as I would in any
> other class.
> You don't see people adding a handler for OnPreRender, you override don't
> you.
> I think who ever was writing the code generator was just being silly.
>
> Ben W
>
> PS Remember to call the base though
>
>
>
> <DanR@REMOVETHISTOGETTOME-warshawgroup.com> wrote in message
> news:OhhgCzlRDHA.2152@TK2MSFTNGP12.phx.gbl...

> > Sorry, I mixed up the code- reposting with correct example now :)
> >
> > I'm trying to better understand the use of inheritance vs. the
> > implementation of a handler. I wanted to ask this question to the

> newsgroup.

> >
> > Each aspx page is a class which Inherits System.Web.UI.Page. Then, each

> page

> > has it's own implementation of Private Sub Page_Load and Private Sub
> > Page_Init to handle the Handles MyBase.Load and Handles MyBase.Init

> events

> > (respectively). The programmer (you or me) is supposed to flesh out the
> > Pgae_Load and, if you are using the Visual Studio designer, not touch

the

> > Page_Init event handlers.
> >
> > Instead of this, why don't these page classes, which are subclasses of
> > System.Web.UI.Page just overload the superclasses of the OnInit and

OnLoad

> > classes? That would seem to make more sense from a class hierarchy
> > standpoint. Each page class, for example
> >
> > 'Instead of this:
> >
> > Public Class WebForm1
> >
> > Inherits System.Web.UI.Page
> >
> > Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
> > System.EventArgs) Handles MyBase.Load
> >
> > 'Put user code to initialize the page here
> >
> > End Sub
> >
> > End Class
> >
> > 'Do this:
> >
> > Public Class WebForm1
> >
> > Inherits System.Web.UI.Page
> >
> > Protected Overrides Sub OnLoad(ByVal e As EventArgs)
> >
> > 'Put user code to initialize the page here
> >
> > MyBase.OnLoad(e)
> >
> > End Sub 'OnInit
> >
> > End Class
> >
> >
> >

>
>