is there a way to refer to public properties in other user controls -- asp.net webcontrols

asp.net webcontrols : is there a way to refer to public properties in other user controls

Web Search Store
4/21/2008 12:21:24 PM

Hello,

I set up a web page with 2 user controls.

In classic asp, the first one did all the declarations, and the second one
used the values, and could reset it.

In ASP.Net so far I can't see how to relate them so this will work.

This user control defines the properties:

<%@ Control ClassName="topdcl" %>

<script language="vb" runat="server">

Private m_addressesstring as String= "adr,phone,zip,"

Public Property addressesstring() As String

Get

Return m_addressesstring

End Get

Set(ByVal value As String)

m_addressesstring = Value

End Set

End Property

Public Sub topdcl1()

addressesstring= "adr,phone,zip,"

End Sub

</script>

This user control tries to access the public property 'addressstring', but
can't:

<%@ Control ClassName="w" %>

<script language="vb" runat="server">

Public Sub w1()

my_topdcl.addressesstring = addressesstring & ",zip"

End Sub

</script>

Here's the page that calls them:

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb"
Inherits="_Default" %>

<%@ Register TagPrefix="Utils" TagName="topdcl" Src="utils/topdcl_try.ascx"
%>

<%@ Register TagPrefix="Utils" TagName="w" Src="utils/w_try.ascx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

<title>Untitled Page</title>

</head>

<body>

<form id="form1" runat="server">

<div>

</div>

</form>

<Utils:topdcl id="My_topdcl" runat="server"/>

<Utils:w id="My_w" runat="server"/>

</body>

</html>

Here's the code behind for this page:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.Load

My_topdcl.topdcl1()

My_w.w1()

End Sub

I would really appreciate any help.

At this point, my only working solution seems to be to combine all the code
into 1 usercontrol, instead of having several. Then variables can refer to
variables in their own class with no problem.

In classic asp, I used includes with all the 'dim' statements in the first,
and the subroutines in later includes.

Thanks.

Scott Baxter.

Web Search Store
4/21/2008 1:42:24 PM

Thanks a lot.

I'll read it.

Scott
[quoted text, click to view]

Teemu Keiski
4/21/2008 11:14:02 PM

Using @reference directive
(http://msdn2.microsoft.com/en-us/library/w70c655a(VS.80).aspx) makes the
UCs type accessible, although not 100% sure how it would behave in this
situation as they'd (UCs) need to reference each other but you can try.

--
Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

[quoted text, click to view]

Stan
4/22/2008 1:40:56 AM

[quoted text, click to view]

Dear Scott

Forget classic asp

ASP.NET is an entirely different platform. It is not merely an
extension of ASP and inherits practically nothing from it. VB.NET is
not the same as the VB used in ASP.

If you want re-usable code or global variables that are not integral
to any visual controls then create them in a separate .vb code file
and store it in the APP_CODE folder of the web site. Any namespaces or
classes created there will be within scope of all pages without the
need for include directives.

User controls are for re-usable visual controls and layouts. They are
not designed to act as an application-wide repository for code.
Anything contained within them that is publicly scoped is accessible
only from a host page that contains an instance of it. For example if
a page has an instance of topdcl placed on it (there can be as many of
them as you like) it will have a unique identifier e.g. topdcl1 The
property named "addressesstring" then becomes topdcl1.addressstring.
It will not be accessible from any other user control either within
the same or a different page, furthermore the value is only relevent
to that particular instance of topdcl.

Web Search Store
4/22/2008 12:23:22 PM

Thank you for that insight.

I'll try putting a class in the app_code folder and see if I can get what I
want.

I'm fully aware that classic .asp is a totally different story. I'm just
trying to accomplish what I used to be able to do there.

Anyway. I'll give it a try.

Thanks.

Scott
[quoted text, click to view]

Dear Scott

Forget classic asp

ASP.NET is an entirely different platform. It is not merely an
extension of ASP and inherits practically nothing from it. VB.NET is
not the same as the VB used in ASP.

If you want re-usable code or global variables that are not integral
to any visual controls then create them in a separate .vb code file
and store it in the APP_CODE folder of the web site. Any namespaces or
classes created there will be within scope of all pages without the
need for include directives.

User controls are for re-usable visual controls and layouts. They are
not designed to act as an application-wide repository for code.
Anything contained within them that is publicly scoped is accessible
only from a host page that contains an instance of it. For example if
a page has an instance of topdcl placed on it (there can be as many of
them as you like) it will have a unique identifier e.g. topdcl1 The
property named "addressesstring" then becomes topdcl1.addressstring.
It will not be accessible from any other user control either within
the same or a different page, furthermore the value is only relevent
to that particular instance of topdcl.

HTH

Web Search Store
4/22/2008 1:03:17 PM

Hello,

Sorry to be so dense. I have been reading about the App_code folder and
trying to put a class in there with a global variable.

Here's what I have:

in a file globals.vb:

Partial Class allofthem

Public ccc As String = "howdy"

End Class

Then, I rightclicked the project, and added existing item, and added this
file, which is in the app_code folder. But the project doesn't seem to know
about it.

What do I do next? My project didn't have an app_code folder, I created it
manually.

Do I need to put an 'inherit' or import statement in?

any help would be appreciated.

scott

[quoted text, click to view]

Dear Scott

Forget classic asp

ASP.NET is an entirely different platform. It is not merely an
extension of ASP and inherits practically nothing from it. VB.NET is
not the same as the VB used in ASP.

If you want re-usable code or global variables that are not integral
to any visual controls then create them in a separate .vb code file
and store it in the APP_CODE folder of the web site. Any namespaces or
classes created there will be within scope of all pages without the
need for include directives.

User controls are for re-usable visual controls and layouts. They are
not designed to act as an application-wide repository for code.
Anything contained within them that is publicly scoped is accessible
only from a host page that contains an instance of it. For example if
a page has an instance of topdcl placed on it (there can be as many of
them as you like) it will have a unique identifier e.g. topdcl1 The
property named "addressesstring" then becomes topdcl1.addressstring.
It will not be accessible from any other user control either within
the same or a different page, furthermore the value is only relevent
to that particular instance of topdcl.

HTH

Stan
4/22/2008 4:35:26 PM

[quoted text, click to view]

Hi

I've tried the same scenario as you and in the same manner but
everything seems to work fine. (There is no need for any specific
import or inherit statement)

Just as a check. Did you create an ordinary web page and try some code
along the following lines (in say the Page_Load event):

Dim aot As New allofthem
Response.Write(aot.ccc)

BTW the App_Code folder can be added to the site by right-clicking the
root of the site in Solution Explorer and choosing the option:

"Add ASP.NET folder" --> App_Code

One other tip. If you add the modifier "Shared" there is no need to
create an instance of the class to access publicly scoped variables
e.g.

Public Shared AString =3D "some text"

Then the content of Astring can be accesses in one line thus:

Response.Write(allofthem.AString)

Stan
4/22/2008 4:41:16 PM

Hello again:

I've just spotted the mistake.

Your class declaration needs to have the "public" attribute as well
thus:

Public Class allofthem

....

Stan

(P.S. the attribute "Partial" is to allow Class code to be spread over

Juan T. Llibre
4/22/2008 7:25:44 PM

Please follow this walkthrough for using Properties in Class files:

http://msdn2.microsoft.com/en-us/library/we4hy2z9.aspx

You don't need to reference the Class file(s).

Make sure you use inline code for that example, whether C# or VB.NET.
There's special rules for using classes in code-behind.

Juan T. Llibre, asp.net MVP
asp.net faq : http://asp.net.do/faq/
foros de asp.net, en español : http://asp.net.do/foros/
======================================
[quoted text, click to view]

Web Search Store
4/23/2008 11:10:29 AM

Thanks.

I'll try what you have said.

Scott
[quoted text, click to view]

Hi

I've tried the same scenario as you and in the same manner but
everything seems to work fine. (There is no need for any specific
import or inherit statement)

Just as a check. Did you create an ordinary web page and try some code
along the following lines (in say the Page_Load event):

Dim aot As New allofthem
Response.Write(aot.ccc)

BTW the App_Code folder can be added to the site by right-clicking the
root of the site in Solution Explorer and choosing the option:

"Add ASP.NET folder" --> App_Code

One other tip. If you add the modifier "Shared" there is no need to
create an instance of the class to access publicly scoped variables
e.g.

Public Shared AString = "some text"

Then the content of Astring can be accesses in one line thus:

Response.Write(allofthem.AString)

Stan

Web Search Store
4/23/2008 11:11:06 AM

Thanks for this tip.

Scott
[quoted text, click to view]

Web Search Store
4/23/2008 12:00:57 PM

Hello,

I think you finally hit on what I needed. Thanks a lot. I have some user
controls that I want to refer to some public arrays, without having to
instantiate a new version of them each time. This class:

Imports Microsoft.VisualBasic

Public Class Try2

Public Shared ihope As String = "whoknows"

End Class

in the 'App_Code' folder seems to do what I need.

I can refer to the variable ihope in the page_load like this:

response.write (try2.ihope)

Also, I can refer to it in my usercontrol like this:

<%@ Control ClassName="w" %>

helloooo

<script language="vb" runat="server">

Public Sub w1()

Response.Write("again" & Try2.ihope)

End Sub

</script>

I think this will accomplish what I want, without a lot of extra property
declarations and all that.

I will see.

Thanks.

Scott

[quoted text, click to view]

Hi

I've tried the same scenario as you and in the same manner but
everything seems to work fine. (There is no need for any specific
import or inherit statement)

Just as a check. Did you create an ordinary web page and try some code
along the following lines (in say the Page_Load event):

Dim aot As New allofthem
Response.Write(aot.ccc)

BTW the App_Code folder can be added to the site by right-clicking the
root of the site in Solution Explorer and choosing the option:

"Add ASP.NET folder" --> App_Code

One other tip. If you add the modifier "Shared" there is no need to
create an instance of the class to access publicly scoped variables
e.g.

Public Shared AString = "some text"

Then the content of Astring can be accesses in one line thus:

Response.Write(allofthem.AString)

Stan

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