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]]

Re: User Control; read value from hosting aspx code-behind

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" <MrWilder@jw.co m> wrote in message
news:O5uVJojJEH A.2680@TK2MSFTN GP11.phx.gbl...[color=blue]
> I have a number of aspx pages on which a single user control appears. All[/color]
of[color=blue]
> the aspx pages and the user control make user of code-behind modules. I[/color]
need[color=blue]
> 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.
>
>[/color]

[Curt_C [MVP]]

Re: User Control; read value from hosting aspx code-behind

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

https://www.Darkfalz.com

"Gene" <MrWilder@jw.co m> wrote in message
news:O5uVJojJEH A.2680@TK2MSFTN GP11.phx.gbl...[color=blue]
> I have a number of aspx pages on which a single user control appears. All[/color]
of[color=blue]
> the aspx pages and the user control make user of code-behind modules. I[/color]
need[color=blue]
> 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.
>
>[/color]

[Gene]

Re: User Control; read value from hosting aspx code-behind

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:e7jCGsjJEH A.1388@TK2MSFTN GP09.phx.gbl...[color=blue]
> 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" <MrWilder@jw.co m> wrote in message
> news:O5uVJojJEH A.2680@TK2MSFTN GP11.phx.gbl...[color=green]
> > I have a number of aspx pages on which a single user control appears.[/color][/color]
All[color=blue]
> of[color=green]
> > the aspx pages and the user control make user of code-behind modules. I[/color]
> need[color=green]
> > for logic in the user control's code-behind to read the current value of[/color][/color]
a[color=blue][color=green]
> > variable in the hosting aspx page's code-behind. How is this[/color][/color]
accomplished?[color=blue][color=green]
> >
> > Thanks.
> >
> >[/color]
>
>[/color]

[Curt_C [MVP]]

Re: User Control; read value from hosting aspx code-behind

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

https://www.Darkfalz.com

"Gene" <MrWilder@jw.co m> wrote in message
news:OTTctyjJEH A.2244@tk2msftn gp13.phx.gbl...[color=blue]
> 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[/color]
to[color=blue]
> fire *before* the page_load of the user control. Is that a safe[/color]
assumption?[color=blue]
>
> Thanks again.
>
>
>
> "Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
> news:e7jCGsjJEH A.1388@TK2MSFTN GP09.phx.gbl...[color=green]
> > 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" <MrWilder@jw.co m> wrote in message
> > news:O5uVJojJEH A.2680@TK2MSFTN GP11.phx.gbl...[color=darkred]
> > > I have a number of aspx pages on which a single user control appears.[/color][/color]
> All[color=green]
> > of[color=darkred]
> > > the aspx pages and the user control make user of code-behind modules.[/color][/color][/color]
I[color=blue][color=green]
> > need[color=darkred]
> > > for logic in the user control's code-behind to read the current value[/color][/color][/color]
of[color=blue]
> a[color=green][color=darkred]
> > > variable in the hosting aspx page's code-behind. How is this[/color][/color]
> accomplished?[color=green][color=darkred]
> > >
> > > Thanks.
> > >
> > >[/color]
> >
> >[/color]
>
>[/color]

[Gene]

Re: User Control; read value from hosting aspx code-behind

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:ugtrF3jJEH A.4052@TK2MSFTN GP11.phx.gbl...[color=blue]
> 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" <MrWilder@jw.co m> wrote in message
> news:OTTctyjJEH A.2244@tk2msftn gp13.phx.gbl...[color=green]
> > 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[/color][/color]
order[color=blue][color=green]
> > for this to work as expected, I need for the page_load event of the aspx[/color]
> to[color=green]
> > fire *before* the page_load of the user control. Is that a safe[/color]
> assumption?[color=green]
> >
> > Thanks again.
> >
> >
> >
> > "Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
> > news:e7jCGsjJEH A.1388@TK2MSFTN GP09.phx.gbl...[color=darkred]
> > > 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" <MrWilder@jw.co m> wrote in message
> > > news:O5uVJojJEH A.2680@TK2MSFTN GP11.phx.gbl...
> > > > I have a number of aspx pages on which a single user control[/color][/color][/color]
appears.[color=blue][color=green]
> > All[color=darkred]
> > > of
> > > > the aspx pages and the user control make user of code-behind[/color][/color][/color]
modules.[color=blue]
> I[color=green][color=darkred]
> > > need
> > > > for logic in the user control's code-behind to read the current[/color][/color][/color]
value[color=blue]
> of[color=green]
> > a[color=darkred]
> > > > variable in the hosting aspx page's code-behind. How is this[/color]
> > accomplished?[color=darkred]
> > > >
> > > > Thanks.
> > > >
> > > >
> > >
> > >[/color]
> >
> >[/color]
>
>[/color]

[Curt_C [MVP]]

Re: User Control; read value from hosting aspx code-behind

newVar = ((YourPage)Page ).publicVariabl eName.ToStirng( );


--
Curt Christianson
Owner/Lead Developer, DF-Software

https://www.Darkfalz.com

"Gene" <MrWilder@jw.co m> wrote in message
news:%23D5pr%23 jJEHA.208@tk2ms ftngp13.phx.gbl ...[color=blue]
> I've tried the initial task using the syntax both you and Steve[/color]
recommended,[color=blue]
> 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:ugtrF3jJEH A.4052@TK2MSFTN GP11.phx.gbl...[color=green]
> > 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" <MrWilder@jw.co m> wrote in message
> > news:OTTctyjJEH A.2244@tk2msftn gp13.phx.gbl...[color=darkred]
> > > Thanks Curt and Steve: Now a related question: I set the public[/color][/color][/color]
variable[color=blue][color=green][color=darkred]
> > > from the aspx page_load event procedure, and want to I read that[/color][/color][/color]
public[color=blue][color=green][color=darkred]
> > > variable from the page_load event procedure of the user control. In[/color][/color]
> order[color=green][color=darkred]
> > > for this to work as expected, I need for the page_load event of the[/color][/color][/color]
aspx[color=blue][color=green]
> > to[color=darkred]
> > > fire *before* the page_load of the user control. Is that a safe[/color]
> > assumption?[color=darkred]
> > >
> > > Thanks again.
> > >
> > >
> > >
> > > "Curt_C [MVP]" <software_AT_da rkfalz.com> wrote in message
> > > news:e7jCGsjJEH A.1388@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" <MrWilder@jw.co m> wrote in message
> > > > news:O5uVJojJEH A.2680@TK2MSFTN GP11.phx.gbl...
> > > > > I have a number of aspx pages on which a single user control[/color][/color]
> appears.[color=green][color=darkred]
> > > All
> > > > of
> > > > > the aspx pages and the user control make user of code-behind[/color][/color]
> modules.[color=green]
> > I[color=darkred]
> > > > need
> > > > > for logic in the user control's code-behind to read the current[/color][/color]
> value[color=green]
> > of[color=darkred]
> > > a
> > > > > variable in the hosting aspx page's code-behind. How is this
> > > accomplished?
> > > > >
> > > > > Thanks.
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >[/color]
> >
> >[/color]
>
>[/color]

[Matt Berther]

Re: User Control; read value from hosting aspx code-behind

Hello Gene,
[color=blue]
> 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.[/color]

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