User Control; read value from hosting aspx code-behind

[Gene]

I have a number of aspx pages on which a single user control appears. All of
the aspx pages and the user control make user of code-behind modules. I need
for logic in the user control's code-behind to read the current value of a
variable in the hosting aspx page's code-behind. How is this accomplished?

Thanks.

[Steve C. Orr [MVP, MCSD]]

From your user control code-behind you can use code similar to this:

If Page.SomePublic Property = "Whatever" Then ...

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://Steve.Orr.net
"Gene" <Mr******@jw.co m> wrote in message
news:O5******** ******@TK2MSFTN GP11.phx.gbl...

I have a number of aspx pages on which a single user control appears. All of the aspx pages and the user control make user of code-behind modules. I need for logic in the user control's code-behind to read the current value of a
variable in the hosting aspx page's code-behind. How is this accomplished?

Thanks.

[Curt_C [MVP]]

On the page make sure it's public

From the control, something like
string myVar = this.ParentPage .variableName.T oString();

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:O5******** ******@TK2MSFTN GP11.phx.gbl...

I have a number of aspx pages on which a single user control appears. All of the aspx pages and the user control make user of code-behind modules. I need for logic in the user control's code-behind to read the current value of a
variable in the hosting aspx page's code-behind. How is this accomplished?

Thanks.

[Gene]

Thanks Curt and Steve: Now a related question: I set the public variable
from the aspx page_load event procedure, and want to I read that public
variable from the page_load event procedure of the user control. In order
for this to work as expected, I need for the page_load event of the aspx to
fire *before* the page_load of the user control. Is that a safe assumption?

Thanks again.

"Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
news:e7******** ******@TK2MSFTN GP09.phx.gbl...

On the page make sure it's public

From the control, something like
string myVar = this.ParentPage .variableName.T oString();

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:O5******** ******@TK2MSFTN GP11.phx.gbl...

I have a number of aspx pages on which a single user control appears. All

of

the aspx pages and the user control make user of code-behind modules. I

need

for logic in the user control's code-behind to read the current value of

a variable in the hosting aspx page's code-behind. How is this accomplished?
Thanks.

[Curt_C [MVP]]

put in a break point and test it to see.
You may need to move it up to the intialize event though

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:OT******** ******@tk2msftn gp13.phx.gbl...

Thanks Curt and Steve: Now a related question: I set the public variable
from the aspx page_load event procedure, and want to I read that public
variable from the page_load event procedure of the user control. In order
for this to work as expected, I need for the page_load event of the aspx to fire *before* the page_load of the user control. Is that a safe assumption?
Thanks again.

"Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
news:e7******** ******@TK2MSFTN GP09.phx.gbl...

On the page make sure it's public

From the control, something like
string myVar = this.ParentPage .variableName.T oString();

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:O5******** ******@TK2MSFTN GP11.phx.gbl...

I have a number of aspx pages on which a single user control appears. All

of

the aspx pages and the user control make user of code-behind modules.

I need

for logic in the user control's code-behind to read the current value

of a variable in the hosting aspx page's code-behind. How is this accomplished?
Thanks.

[Gene]

I've tried the initial task using the syntax both you and Steve recommended,
however, either way I get compile-time errors, the message of which is
something like:
'System.Web.UI. Page' does not contain a definition for 'myPublicVariab le'

It makes sense that such compile-time errors would occur, as the user
control - at compile time - does not know which aspx page will be hosting
it, and the compiler therefore cannot know where to look to see if the
public property exists. Am I confused? Is it possible to do this without
getting the compile-time error and I'm just missing something.

Thanks.


"Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
news:ug******** ******@TK2MSFTN GP11.phx.gbl...

put in a break point and test it to see.
You may need to move it up to the intialize event though

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:OT******** ******@tk2msftn gp13.phx.gbl...

Thanks Curt and Steve: Now a related question: I set the public variable
from the aspx page_load event procedure, and want to I read that public
variable from the page_load event procedure of the user control. In order

for this to work as expected, I need for the page_load event of the aspx to

fire *before* the page_load of the user control. Is that a safe

assumption?

Thanks again.

"Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
news:e7******** ******@TK2MSFTN GP09.phx.gbl...

On the page make sure it's public

From the control, something like
string myVar = this.ParentPage .variableName.T oString();

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:O5******** ******@TK2MSFTN GP11.phx.gbl...
> I have a number of aspx pages on which a single user control

appears. All

of
> the aspx pages and the user control make user of code-behind

modules. I need
> for logic in the user control's code-behind to read the current

value of

a

> variable in the hosting aspx page's code-behind. How is this

accomplished?

>
> Thanks.
>
>

[Curt_C [MVP]]

newVar = ((YourPage)Page ).publicVariabl eName.ToStirng( );
--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:%2******** *********@tk2ms ftngp13.phx.gbl ...

I've tried the initial task using the syntax both you and Steve recommended, however, either way I get compile-time errors, the message of which is
something like:
'System.Web.UI. Page' does not contain a definition for 'myPublicVariab le'

It makes sense that such compile-time errors would occur, as the user
control - at compile time - does not know which aspx page will be hosting
it, and the compiler therefore cannot know where to look to see if the
public property exists. Am I confused? Is it possible to do this without
getting the compile-time error and I'm just missing something.

Thanks.


"Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
news:ug******** ******@TK2MSFTN GP11.phx.gbl...

put in a break point and test it to see.
You may need to move it up to the intialize event though

--
Curt Christianson
Owner/Lead Developer, DF-Software
www.Darkfalz.com
"Gene" <Mr******@jw.co m> wrote in message
news:OT******** ******@tk2msftn gp13.phx.gbl...

Thanks Curt and Steve: Now a related question: I set the public variable from the aspx page_load event procedure, and want to I read that public variable from the page_load event procedure of the user control. In order for this to work as expected, I need for the page_load event of the

aspx

to

fire *before* the page_load of the user control. Is that a safe

assumption?

Thanks again.

"Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
news:e7******** ******@TK2MSFTN GP09.phx.gbl...
> On the page make sure it's public
>
> From the control, something like
> string myVar = this.ParentPage .variableName.T oString();
>
> --
> Curt Christianson
> Owner/Lead Developer, DF-Software
> www.Darkfalz.com
>
>
> "Gene" <Mr******@jw.co m> wrote in message
> news:O5******** ******@TK2MSFTN GP11.phx.gbl...
> > I have a number of aspx pages on which a single user control

appears. All
> of
> > the aspx pages and the user control make user of code-behind

modules.

I

> need
> > for logic in the user control's code-behind to read the current

value

of

a
> > variable in the hosting aspx page's code-behind. How is this
accomplished?
> >
> > Thanks.
> >
> >
>
>

[Matt Berther]

Hello Gene,

see if the public property exists. Am I confused? Is it possible to do
this without getting the compile-time error and I'm just missing
something.

Derive your own page class.

Ex:

public class MyPage : System.Web.UI.P age
{
public string myPublicVariabl e; // Note: I would never make this as a field in production code. This is just to illustrate.
}

From your user control:

MyPage myPage = (MyPage)this.Pa ge;
string s = myPage.myPublic Variable;

--
Matt Berther
http://www.mattberther.com