Re: How to get all web controls from a page?
- From: "Patirck Ige" <naijacoder@xxxxxxxxxxx>
- Date: Wed, 5 Oct 2005 12:53:30 +1000
Antony there is a clean example here at:-
http://aspnet101.com/aspnet101/tutorials.aspx?id=20
Hope tha helps
Patrick
<antonyliu2002@xxxxxxxxx> wrote in message
news:1128460641.669356.234940@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hmm, that looks great. Looks like this way I am liberated from the
> tedious session creation and retrieval task. I will definitely try to
> test this. You might wanna put a tutorial about this on your web.
>
>
> Karl Seguin wrote:
> > Well, if you only need the data to exist while a user hits next> next>
next>
> > or <prev <prev <prev, you could do:
> >
> > dim user as new User()
> > ....
> > Context.Items.Add("NewUser", user)
> > Server.Transfer("Page2.aspx")
> >
> >
> > and then you can retrieve the user from Page2.aspx ala:
> > dim user as User = ctype(Context.Items("NewUser", User")
> > 'don't forget to check for nothing..
> >
> > Karl
> >
> > --
> > MY ASP.Net tutorials
> > http://www.openmymind.net/
> > <antonyliu2002@xxxxxxxxx> wrote in message
> > news:1128451577.162694.126320@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > > Hi,
> > >
> > > Thanks a lot. Sounds like that is a much better way than session to
> > > achieve my goal. However, I still don't know anything about that yet.
> > >
> > >
> > > Actually, a few days ago, I asked in this group if there is a better
> > > way than session, here:
> > >
> > >
http://groups.google.com/group/microsoft.public.dotnet.framework.aspnet/browse_frm/thread/a556ad31b5d7acb1/7656748848a2d36d?q=antonyliu2002+session&rnum=4&hl=en#7656748848a2d36d
> > >
> > > The MSDN link is helpful, but I cannot jumpstart from that brief doc.
> > > Could you point me to some more detailed documentation about how to
> > > implement this?
> > >
> > > Thanks.
> > >
> > > Karl Seguin wrote:
> > >> Well, it's just going to lead to a cumbersome and complex design, in
my
> > >> opinion.
> > >>
> > >> Either use Server.Transfer and PreserveForm
> > >>
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html
/frlrfSystemWebHttpServerUtilityClassTransferTopic2.asp)
> > >> which will maintain REquest.Form so atleast it's only 1/2 as
hackish...or
> > >> better yet...
> > >>
> > >> create a business object and passthat in your session.
> > >>
> > >> Say you are building a user registration thing with 3 pages, page 1 :
> > >> basic
> > >> information, page 2: address, page 3: membership details
> > >>
> > >> Page 1 -->
> > >>
> > >> sub btnPage2_Clicked
> > >> dim user as new User()
> > >> user.Name = UserName.Text
> > >> user.Email= Email.Text
> > >> user.Country= Country.SelectedValue
> > >> Session("NewUser") = user
> > >> Response.Redirect("Page2.aspx")
> > >> end sub
> > >>
> > >> Page 2 -->
> > >> dim user as User = ctype(Session("NewUser"), User)
> > >> if user is nothing then
> > >> 'error, has to start on page 1
> > >> end if
> > >> user.Telephone = telephone.TExt
> > >> ...
> > >> ..
> > >> Response.Redirect("Page2.aspx")
> > >> end sub
> > >>
> > >> or you could just store the user in Context.ITems and use a
> > >> Server.Transfer.
> > >>
> > >> Anyways, it's similar to what you are doing, but it's better
> > >> encapsulated.
> > >> You aren't passing 100 pieces of free floating information around,
but
> > >> rather passing a single object and building it up....assuming that's
> > >> applicable to what you are doing.
> > >>
> > >> Karl
> > >>
> > >> --
> > >> MY ASP.Net tutorials
> > >> http://www.openmymind.net/
> > >> <antonyliu2002@xxxxxxxxx> wrote in message
> > >> news:1128449434.731741.183270@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > >> > First of all, thanks a lot for the sample code.
> > >> >
> > >> > Secondly, do you mean that it is not a good idea to create a
session
> > >> > object for each web control?
> > >> >
> > >> > I don't know if this is a good design or not, but my boss wants the
> > >> > user-supplied data in web forms across multiple pages to be
retained
> > >> > while they jump around these pages.
> > >> >
> > >> > So, I think that session is the best solution. If looping through
all
> > >> > web controls is troublesome, I'll just do it the dumb way: create a
> > >> > session line after another.
> > >> >
> > >> >
> > >> > Karl Seguin wrote:
> > >> >> I'm cautious about given any help 'cuz your approach seems mad!
Why
> > >> >> in
> > >> >> the
> > >> >> world would you ever want to do what you are doing?! We'll, I'll
> > >> >> assume
> > >> >> you've thought it trough *shrug*.
> > >> >>
> > >> >> public sub LoadIntoSession(byval parent as control, byref count as
> > >> >> integer)
> > >> >> for each child as Control in Parent.Controls
> > >> >> count = count + 1
> > >> >> dim sessionKey as string = "Session" + count.ToString()
> > >> >> dim value as string
> > >> >> if typeof child is TextBox then
> > >> >> value = ctype(child, TextBox).Text
> > >> >> else if typeof child is ListControl then
> > >> >> value = ctype(child, DropDownList).SelectedValue
> > >> >> else if typeof child is ... ' youneed to do this for every
type
> > >> >> ..
> > >> >> end if
> > >> >>
> > >> >> if child.HasControl then
> > >> >> LoadIntoSession(child, count)
> > >> >> end if
> > >> >> next
> > >> >> end sub
> > >> >>
> > >> >>
> > >> >> Page_Load
> > >> >> LoadIntoSession(Page, 0)
> > >> >> end sub
> > >> >>
> > >> >>
> > >> >> That code isn't perfect, but something like that should help...
> > >> >>
> > >> >> I still think it's probably a bad design...whatever you are
doing....
> > >> >> Server.Transfer w/preserve Form might work, or using the
> > >> >> HttpContext....
> > >> >>
> > >> >> Karl
> > >> >>
> > >> >> --
> > >> >> MY ASP.Net tutorials
> > >> >> http://www.openmymind.net/
> > >> >> <antonyliu2002@xxxxxxxxx> wrote in message
> > >> >> news:1128447022.689767.319880@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > >> >> >I want to create session objects for all web controls in a page.
> > >> >> >Right
> > >> >> > now, I am doing it in a dumb way like this (for example):
> > >> >> >
> > >> >> > Session("Session1") = ctrl1.Text
> > >> >> > Session("Session2") = ctrl2.Text
> > >> >> > Session("Session3") = ctrl3.Text
> > >> >> > Session("Session4") = ctrl4.SelectedValue
> > >> >> > Session("Session5") = ctrl5.Text
> > >> >> > Session("Session6") = ctrl6.Text
> > >> >> >
> > >> >> > It would be good if I can get all web controls and loop through
> > >> >> > them.
> > >> >> > I searched this group and noticed that this topic has been
discussed
> > >> >> > in
> > >> >> > a few threads. But I've tried
> > >> >> >
> > >> >> > For Each objCtrl in Page.FindControl("MyForm").Controls
> > >> >> >
> > >> >> > and
> > >> >> >
> > >> >> > For Each objCtrl In Page.Controls
> > >> >> >
> > >> >> > and
> > >> >> >
> > >> >> > For Each objCtrl In MyForm.Controls
> > >> >> >
> > >> >> > and
> > >> >> >
> > >> >> > For Each objCtrl In Me.Controls
> > >> >> >
> > >> >> > None of them worked. Would any guru please share your idea?
> > >> >> > Thanks.
> > >> >> >
> > >> >
> > >
>
.
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