Reference A var on Master Page from User Control

[Guest]

I have setup a public variable in the Master Page "code-behind-file". Now I
would like to set that value from the UserControl, but I can't seem to find a
way to do this. Does anyone have any ideas? I'm basically trying to set it up
so that I can keep the User infor (userid, ect) in the Masterpage so that
other pages can access it. Thanks for any ideas.
Michael

 

[S. Justin Gengo]

Michael,

Do it with a private variable and public property.

Private _UserId As Int32

Public Property UserId() As Int32
Get
Return _UserId
End Get
Set (ByVal value As Int32)
_UserId = Value
End Set
End Property

'---And now here's the trick:
' On any page you want to access the property
' from in the HTML View just below the
' <@pagedelcaration put:
' <%@ MasterType VirtualPath="~/MasterPage.master" %> Like this:
<%@ Page Language="VB" MasterPageFile="~/MasterPage.master"
MaintainScrollPositionOnPostback="true" AutoEventWireup="false"
CodeFile="Auction.aspx.vb" Inherits="Auction" title="Auction" %>

<%@ MasterType VirtualPath="~/MasterPage.master" %>

The MasterType declaration pointing to the master file in question is what
let's you access properties and other public declarations in the master
page.

Regards,

--
S. Justin Gengo
Web Developer / Programmer

Free code library:
http://www.aboutfortunate.com

"Out of chaos comes order."
Nietzsche

 

[Craig Deelsnyder]

I have setup a public variable in the Master Page "code-behind-file".
Now I
would like to set that value from the UserControl, but I can't seem to
find a
way to do this. Does anyone have any ideas? I'm basically trying to set
it up
so that I can keep the User infor (userid, ect) in the Masterpage so that
other pages can access it. Thanks for any ideas.
Michael

The UserControl has a .Page property, from which you can get its MasterPage

ex:
this.Page.MasterPageFile

then cast that appropriately to the MasterPage type to access your
property.

 

[Guest]

Hi,
Thanks for the reply. I tried setting up a Public Property, just as you
suggested and I still can't get access to the Property in the Master Page
from the UserControl on that Master Page.
Page.Master.???? don't work
I've also tried wrapping Master Page, Usercontrol in the same namespace and
I got other errors (saw this suggestion in another message). Am I trying to
access the master in the wrong way? Or am I missing something. Thanks.
Michael

 

[Guest]

Hi Craig,
Thanks for the reply, I tried using
Dim ms as MasterPage = CType(Me.Page.MasterPageFile, MasterPage )
But I get a error trying to convert string to MasterPage. How do I do this
with the MasterPageFile property? Can you please give me a short example.
Thanks so much for the help.
Michael
P.S. Have you seen any article or books that discuss issues like this with
MasterPages?

 

[S. Justin Gengo]

Michael,

I'm not positive how to do it from the usercontrol itself, but this may lead
you in the right direction. From the page that the usercontrol is on you
just use Master.[Property]

That's what the MasterType reference lets you do.

Regards,

--
S. Justin Gengo
Web Developer / Programmer

Free code library:
http://www.aboutfortunate.com

"Out of chaos comes order."
Nietzsche

 

[Craig Deelsnyder]

Hi Craig,
Thanks for the reply, I tried using
Dim ms as MasterPage = CType(Me.Page.MasterPageFile, MasterPage )
But I get a error trying to convert string to MasterPage. How do I do
this
with the MasterPageFile property? Can you please give me a short example.
Thanks so much for the help.
Michael
P.S. Have you seen any article or books that discuss issues like this
with
MasterPages?

whoops! sleep-deprived friday for me....sorry, that property gives the
filename...change MasterPageFile to just Master

Dim ms as MasterPage = CType(Me.Page.Master, MasterPage )

sorry, I don't have many links on it, I've used master pages since 1.x so
I don't know of good 2.0 articles; I just did a refresher of the changes
they made in 2.0 by reading it in a book. Here's one article that looks
decent:

http://www.codeproject.com/aspnet/InsideMasterPages.asp

 

[Guest]

Michael,

If I understood your scenario correctly, then you have a master page (which
is a control on the page) that has a child user control that needs to
communicate data (users information that is generated perhaps after some user
input) to the parent control (the master page).

In such scenarios (of communicating data between 2 controls on a web form)
you need to look at using events. When the child user control finishes
collecting the user info, then you raise an event, that would be consumed by
the parent control (the master page), which in turn would display the data on
its control (or do whatever other processing required).

To understand how to raise an event from the child control and how to
consume it by the master page, review these articles on the MSDN:
http://msdn2.microsoft.com/en-us/library/17sde2xt.aspx

 

[Guest]

Hi Phillip,
Thanks so much for the reply. I've started to look into this and have come
across one issue. It seems that AddHandler is not supported in ASP.NET. Is
this true, if so, what includes do I need to include into the project. Here
is what I have so far.
Just a refresher of what I needed:
1. User enter UserId & password and selects submit.
2. The login User control will check what roles they have and create a User
Object.
3. Set the User Object to a Value stored in the MasterPage.
4. Purchasing screen shown and depending on the Role the user has will
determine what the user sees (Admin/Standard user).
So what I have come up with so far based on the event based noticifaction.
Stand alone Class File:
Public Class UserInfoEventArgs
Inherits EventArgs
Private _User as User

Public sub new(UserInfo as User )
_User = UserInfo
End Sub

Public ReadOnly Property UserInfo() as User
Get
UserInfo = _User
End Get
End Property
End Class

In the Login User Control:
Public Event Alarm as UserInfoEventHandler

Protected OverRidable Sub OnAlarm(e as UserInfoEventArgs )
RaiseEvent Alarm(me, e)
End Sub

Sub AuthenticateUser(userId as string, password as password)
'Do stuff here.......
'Now feed the UserInfo to the MasterPage via a Event
Dim e as New UserInfoEventArgs(lUser)
OnAlarm(e)
'Do more stuff....
end sub

In the MasterPage:
AddHandler Alarm, AddressOf OnCurrentUser

Public sub OnCurrentUser(sender as Object, e as UserInfoEventArgs )
_CurrentUser = e.UserInfo
End Sub
Note: I get a syntax error on the AddHandler line.

Do I have this setup correctly for an ASP.NET page? Thanks again for any
suggestions.
Michael

 

[Guest]

Hi Michael,

You are 99% done. You just missed the correct syntax for AddHandler. It
should be like this:

AddHandler NameOfObject.Event, AddressOf MethodHandlingTheEvent
e.g.
AddHandler LoginInfoObject.Alarm, AddressOf OnCurrentUser

You could have also used the handle keyword on your method declaration like
this:

Public sub OnCurrentUser(sender as Object, e as UserInfoEventArgs ) Handles
LoginInfoObject.Alarm
_CurrentUser = e.UserInfo
End Sub

 

[Guest]

Hi Phillip,
Thanks for the reply. Ok, I think I'm almost there. What I did was add the
following to the Page_Load event of the Master Page:
AddHandler LogIn1.Alarm , AddressOf OnCurrentUser

For some reason the event is not kicked off. I stepped through the code, and
after I hit submit (Login) the code in the Login user control works right,
and calls the RaiseEvent procedure. But for some reason the Master Page event
is not kicked off. The Page_Load event of the Master Page is run again after
clicking the Login button so the AddHandler is being called. Does this make
since. Thanks for any help.
Michael

 

[Guest]

Hi Phillip,
I got the problem solved: I changed the code as follows:
Public sub OnCurrentUser(sender as Object, e as UserInfoEventArgs ) Handles
LogIn1.Alarm

Now the code is working right. I want to thank you again for the help.

 

[Guest]

My pleasure.

 

[Guest]

Hi Michael,

Yes, you should have placed the event wiring during the page.init. (The
other solution of using the handles statement of the function signature that
you got working does the same)

 

[www.clubpath.com]

Try using

Namespace.YourMasterPageName master = (Namespace.YourMasterPageName)Page.Master;

then you should be able to access your public variable from your user control through:

master.VariableName;

hth

Will

www.clubpath.com | Toronto Night Club Pictures