order of execution of page_load in a base and derived classes

[z. f.]

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the original
System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" / derived
page gets to be executed.

but i have noticed that the derived page load event gets to be called before
the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like button)
event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before the
base?

is this also the order of execution in inheritence or only with delegated
event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

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

Hi,

I have never been in this situation, but the first thing I would try is in
the Form.OnInit move the base.OnInit to the start of the method, before
register the Load handler for the current page.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the original System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" / derived page gets to be executed.

but i have noticed that the derived page load event gets to be called before the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like button) event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before the base?

is this also the order of execution in inheritence or only with delegated
event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[Karl]

Please don't cross-post.

I'm assuming you are using C# 'cuz you wouldn't have this behaviour in
VB....anyways, the simplest solution is to go into your derived page's
OnInit function in the "Web Form Designer generated code" region, and change
the order of the two executions:

InitializeComponent();
base.OnInit(e);

to

base.OnInit(e);
InitializeComponent();

This will cause the base page's init to load first, which will cause it's
Load event to get hooked up first, thus causing it to fire first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the original System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" / derived page gets to be executed.

but i have noticed that the derived page load event gets to be called before the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like button) event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before the base?

is this also the order of execution in inheritence or only with delegated
event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

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

Hi again

I'm not very sure that the previous answer will solve the problem, IIRC
the order of execution of the handlers is not defined. therefore even ify ou
register first the parent you may get the derived executing first after all.

Therefore you have to use another approach, you could use a virtual method
that you call in the OnLoad event, so each class Page) define what needs to
be checked , being the trick to verify the parent first to have the first
line calling the parent method:
protected override Check()
{
parent.Check();
//do the checking
}

I think this will solve your problem.
Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the original System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" / derived page gets to be executed.

but i have noticed that the derived page load event gets to be called before the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like button) event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before the base?

is this also the order of execution in inheritence or only with delegated
event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[z. f.]

i use vb.net
and i don't override the OnInit method in my PageBase.

"Karl" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net> wrote in
message news:uP**************@TK2MSFTNGP09.phx.gbl...

Please don't cross-post.

I'm assuming you are using C# 'cuz you wouldn't have this behaviour in
VB....anyways, the simplest solution is to go into your derived page's
OnInit function in the "Web Form Designer generated code" region, and change the order of the two executions:

InitializeComponent();
base.OnInit(e);

to

base.OnInit(e);
InitializeComponent();

This will cause the base page's init to load first, which will cause it's
Load event to get hooked up first, thus causing it to fire first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before

the

base?

is this also the order of execution in inheritence or only with delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[z. f.]

i wouldn't like to add code to each page-class i add.
the idea behind using a PageBase is to not change the way i write the other
pages, just let them use the services the PageBase implement without even
"knowing" anout it.
"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote
in message news:%2****************@tk2msftngp13.phx.gbl...

Hi again

I'm not very sure that the previous answer will solve the problem, IIRC
the order of execution of the handlers is not defined. therefore even ify ou register first the parent you may get the derived executing first after all.
Therefore you have to use another approach, you could use a virtual method that you call in the OnLoad event, so each class Page) define what needs to be checked , being the trick to verify the parent first to have the first
line calling the parent method:
protected override Check()
{
parent.Check();
//do the checking
}

I think this will solve your problem.
Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before

the

base?

is this also the order of execution in inheritence or only with delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[Benjamin Schwitter]

We had the same problem with the Page_Load Event.

We solved it similar to the way Ignacio Machin describes using the OnLoad
event.

Good luck,

Benjamin Schwitter

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote
in message news:#n**************@tk2msftngp13.phx.gbl...

Hi again

I'm not very sure that the previous answer will solve the problem, IIRC
the order of execution of the handlers is not defined. therefore even ify ou register first the parent you may get the derived executing first after all.
Therefore you have to use another approach, you could use a virtual method that you call in the OnLoad event, so each class Page) define what needs to be checked , being the trick to verify the parent first to have the first
line calling the parent method:
protected override Check()
{
parent.Check();
//do the checking
}

I think this will solve your problem.
Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before

the

base?

is this also the order of execution in inheritence or only with delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[z. f.]

also

from the IL created by VB compiler you see that in the constructor it is
adding the event handler:

Public Sub New()
AddHandler MyBase.Load, New EventHandler(AddressOf Me.Page_Load)
End Sub

"Karl" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net> wrote in
message news:uP**************@TK2MSFTNGP09.phx.gbl...

Please don't cross-post.

I'm assuming you are using C# 'cuz you wouldn't have this behaviour in
VB....anyways, the simplest solution is to go into your derived page's
OnInit function in the "Web Form Designer generated code" region, and change the order of the two executions:

InitializeComponent();
base.OnInit(e);

to

base.OnInit(e);
InitializeComponent();

This will cause the base page's init to load first, which will cause it's
Load event to get hooked up first, thus causing it to fire first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the
class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called before

the

base?

is this also the order of execution in inheritence or only with delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[Karl]

Can you show me some code? If I do this:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Trace.Write("derived load")
end sub

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Trace.Write("baseload")
end sub

the base load always fires first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2***************@TK2MSFTNGP09.phx.gbl...

i use vb.net
and i don't override the OnInit method in my PageBase.

"Karl" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net> wrote in
message news:uP**************@TK2MSFTNGP09.phx.gbl...

Please don't cross-post.

I'm assuming you are using C# 'cuz you wouldn't have this behaviour in
VB....anyways, the simplest solution is to go into your derived page's
OnInit function in the "Web Form Designer generated code" region, and

change

the order of the two executions:

InitializeComponent();
base.OnInit(e);

to

base.OnInit(e);
InitializeComponent();

This will cause the base page's init to load first, which will cause it's

Load event to get hooked up first, thus causing it to fire first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called

before the

base?

is this also the order of execution in inheritence or only with

delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

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

Hi,

IIRC the Page_Load is added in the OnInit handler:

override protected void OnInit(EventArgs e)
{
InitializeComponent();
base.OnInit(e);
}
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:eF**************@TK2MSFTNGP15.phx.gbl...

also

from the IL created by VB compiler you see that in the constructor it is
adding the event handler:

Public Sub New()
AddHandler MyBase.Load, New EventHandler(AddressOf Me.Page_Load)
End Sub

"Karl" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net> wrote in
message news:uP**************@TK2MSFTNGP09.phx.gbl...

Please don't cross-post.

I'm assuming you are using C# 'cuz you wouldn't have this behaviour in
VB....anyways, the simplest solution is to go into your derived page's
OnInit function in the "Web Form Designer generated code" region, and

change

the order of the two executions:

InitializeComponent();
base.OnInit(e);

to

base.OnInit(e);
InitializeComponent();

This will cause the base page's init to load first, which will cause it's

Load event to get hooked up first, thus causing it to fire first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called

before the

base?

is this also the order of execution in inheritence or only with

delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

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

Hi,

You add it where you need it. each page's method should be responsible to
handle the functionalities implemented on it. All you have to do is call the
method in the Page_Load.

Why is that not ok with you?

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:es**************@TK2MSFTNGP15.phx.gbl...

i wouldn't like to add code to each page-class i add.
the idea behind using a PageBase is to not change the way i write the other pages, just let them use the services the PageBase implement without even
"knowing" anout it.
"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote in message news:%2****************@tk2msftngp13.phx.gbl...

Hi again

I'm not very sure that the previous answer will solve the problem, IIRC

the order of execution of the handlers is not defined. therefore even ify

ou

register first the parent you may get the derived executing first after

all.

Therefore you have to use another approach, you could use a virtual

method

that you call in the OnLoad event, so each class Page) define what needs

to

be checked , being the trick to verify the parent first to have the

first line calling the parent method:
protected override Check()
{
parent.Check();
//do the checking
}

I think this will solve your problem.
Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi,

i have a class that is derived from System.Web.UI.Page, and this is the class i use in my application as PageBase.
all other page classes are deriverd from my PageBase instead of the

original

System.Web.UI.Page in order to have common checks in the page base.

i make securirty checks in the page base page_load event.
if the security fails, i can do whatever i want before the "real" /

derived

page gets to be executed.

but i have noticed that the derived page load event gets to be called

before

the base page load event.

so i have a problem.

i can cancel the use of page_load in my derived pages, but i use this
function to check on PostBack events that does not have server (like

button)

event handler, but there when will i move it to?

is this the correct execution order - the derived gets to called

before the

base?

is this also the order of execution in inheritence or only with

delegated event handlers? ( i mean when you use the syntax of Page.onLoad +=
this_onLoad )....

TIA, z.

[z. f.]

you mean in c# don't you?
it is no question, it's a fact VB does it the way i showed, you can't
control it.

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote
in message news:ux**************@tk2msftngp13.phx.gbl...

Hi,

IIRC the Page_Load is added in the OnInit handler:

override protected void OnInit(EventArgs e)
{
InitializeComponent();
base.OnInit(e);
}
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:eF**************@TK2MSFTNGP15.phx.gbl...

also

from the IL created by VB compiler you see that in the constructor it is
adding the event handler:

Public Sub New()
AddHandler MyBase.Load, New EventHandler(AddressOf Me.Page_Load)
End Sub

"Karl" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net> wrote in

message news:uP**************@TK2MSFTNGP09.phx.gbl...

Please don't cross-post.

I'm assuming you are using C# 'cuz you wouldn't have this behaviour in
VB....anyways, the simplest solution is to go into your derived page's
OnInit function in the "Web Form Designer generated code" region, and

change

the order of the two executions:

InitializeComponent();
base.OnInit(e);

to

base.OnInit(e);
InitializeComponent();

This will cause the base page's init to load first, which will cause

it's Load event to get hooked up first, thus causing it to fire first.

Karl

"z. f." <zi**@info-scopeREMSPAM.co.il> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...
> Hi,
>
> i have a class that is derived from System.Web.UI.Page, and this is the > class i use in my application as PageBase.
> all other page classes are deriverd from my PageBase instead of the
original
> System.Web.UI.Page in order to have common checks in the page base.
>
> i make securirty checks in the page base page_load event.
> if the security fails, i can do whatever i want before the "real" /
derived
> page gets to be executed.
>
> but i have noticed that the derived page load event gets to be called before
> the base page load event.
>
> so i have a problem.
>
> i can cancel the use of page_load in my derived pages, but i use this > function to check on PostBack events that does not have server (like
button)
> event handler, but there when will i move it to?
>
> is this the correct execution order - the derived gets to called before the
> base?
>
> is this also the order of execution in inheritence or only with

delegated

> event handlers? ( i mean when you use the syntax of Page.onLoad +=
> this_onLoad )....
>
> TIA, z.
>
>