How do I access MasterPage functionality from an App_Code class?

[dawg1998]

I am trying to access a label located in a MasterPage from a class
located in my application's App_Code folder. The problem seems to be
that the class cannot communicate with the MasterPage due to a lack of
reference to it. How do I supply a reference to the class so that it
can populate the label? My code is below...

*The reason I am doing it this way, is that I want the typical code
used to supply a string to the MasterPage label to be hidden away in
case I change it later on. Using an object to send a string to the
class allows me to do this without committing each and every page to a
specific method.*

``````````````` ``````````````` ``````````````` ``````````````` `
1) So, in my MasterPage I set up a simple Label control:

<asp:label id="lblLabel" runat="server" />

2) In a class stored in App_Code I set up a procedure to populate the
label in the MasterPage:

Public Namespace CustomClasses
Public Class MessageMaker
Public Sub CreateMessage(B yVal strMessage As String)

Dim lblError As Label
lblError = Master.FindCont rol("lblLabel")
lblError.Text = strMessage

End Sub
End Class
End Namespace

In a content page, I want a procedure to create that creates a message
in the MasterPage label. This will be used for all system messages sent
to the user.

Dim objMessage As New CustomClasses.M essageMaker()
objMessage.Crea teMessage("This is a Test")

[Peter Bromberg [C# MVP]]

RE: How do I access MasterPage functionality from an App_Code class?

You may find it easier by changing the pattern:

Public Function CreateMessage(B yVal strMessage As String) As String
strMessage="Her e it is" & strMessage
return strMessage
End Function

In your page,


Dim objMessage As New CustomClasses.M essageMaker()
Dim lbl As Label = Master.FindCont rol("label1")
Dim msg as String =Master.FindCon trol(objMessage .CreateMessage( "This is a
Test")
lbl.Text=msg

Otherwise, you would need to figure out a way to pass the page context to
your class. You *CAN* do this if absolutely necessary:

Public Function CreateMessage(B yVal strMessage As String, ByRef Page as
System.Web.UI.P age) As String
' etc.
End Function



Hope that helps.
Peter


--
Co-founder, Eggheadcafe.com developer portal:

http://www.eggheadcafe.com

UnBlog:

http://petesbloggerama.blogspot.com

"dawg1998" wrote:
[color=blue]
> I am trying to access a label located in a MasterPage from a class
> located in my application's App_Code folder. The problem seems to be
> that the class cannot communicate with the MasterPage due to a lack of
> reference to it. How do I supply a reference to the class so that it
> can populate the label? My code is below...
>
> *The reason I am doing it this way, is that I want the typical code
> used to supply a string to the MasterPage label to be hidden away in
> case I change it later on. Using an object to send a string to the
> class allows me to do this without committing each and every page to a
> specific method.*
>
> ``````````````` ``````````````` ``````````````` ``````````````` `
> 1) So, in my MasterPage I set up a simple Label control:
>
> <asp:label id="lblLabel" runat="server" />
>
> 2) In a class stored in App_Code I set up a procedure to populate the
> label in the MasterPage:
>
> Public Namespace CustomClasses
> Public Class MessageMaker
> Public Sub CreateMessage(B yVal strMessage As String)
>
> Dim lblError As Label
> lblError = Master.FindCont rol("lblLabel")
> lblError.Text = strMessage
>
> End Sub
> End Class
> End Namespace
>
> In a content page, I want a procedure to create that creates a message
> in the MasterPage label. This will be used for all system messages sent
> to the user.
>
> Dim objMessage As New CustomClasses.M essageMaker()
> objMessage.Crea teMessage("This is a Test")
>
>[/color]

[dawg1998]

Re: How do I access MasterPage functionality from an App_Code class?

Peter:

Thanks for the reply.

My goal, though, is to eliminate the "Master.FindCon trol('label1')" bit
of code from my content page and move that to the class in App_Code.

So, yes, I guess my goal is to pass the page context to the class. Is
the method you detailed a costly one in terms of resource usage?

rb