Iterating through controls in .Net 2.0

[Dave H]

I was doing this in a .Net 1.1 site, but it doesn't work in 2.0, because the
objects aren't public (I think)

For k = 1 To iDDLCount
ddlObject = CallByName(oPar ent, sDDLName & k, CallType.Get)
ddlObject.Items .Clear()
Next

Any ideas?

Thanks, Dave

[Steve C. Orr [MVP, MCSD]]

I'm not entirely sure what you're trying to do, but perhaps you can loop
through all the controls in a form using control tree recursion as I've
shown in this code sample:
http://SteveOrr.net/faq/ControlTreeRecursion.aspx

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://SteveOrr.net
"Dave H" <Da***@noemail. nospam> wrote in message
news:-L************** *************** *@comcast.com.. .

I was doing this in a .Net 1.1 site, but it doesn't work in 2.0, because
the objects aren't public (I think)

For k = 1 To iDDLCount
ddlObject = CallByName(oPar ent, sDDLName & k, CallType.Get)
ddlObject.Items .Clear()
Next

Any ideas?

Thanks, Dave

[Dave H]

I have a class that I put support code in, it's why I have to passs the
parent.

Say, on a page, I have 5 controls called 'DropDownList1' ...'DropDownLis t5'

I use this code to set them, and fill them with thier defaults. I'll give
this a try..

"Steve C. Orr [MVP, MCSD]" <St***@Orr.ne t> wrote in message
news:Ox******** ******@TK2MSFTN GP02.phx.gbl...

I'm not entirely sure what you're trying to do, but perhaps you can loop
through all the controls in a form using control tree recursion as I've
shown in this code sample:
http://SteveOrr.net/faq/ControlTreeRecursion.aspx

--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://SteveOrr.net
"Dave H" <Da***@noemail. nospam> wrote in message
news:-L************** *************** *@comcast.com.. .

I was doing this in a .Net 1.1 site, but it doesn't work in 2.0, because
the objects aren't public (I think)

For k = 1 To iDDLCount
ddlObject = CallByName(oPar ent, sDDLName & k, CallType.Get)
ddlObject.Items .Clear()
Next

Any ideas?

Thanks, Dave

[Walter Wang [MSFT]]

Thanks Steve for you informative input.

Hi Dave,

Based on my understanding, you question is how to use a generic method to
iterate child controls on a form and clear all DropDownList's items. If
I've misunderstood anything, please feel free to post here.

Protected Sub Button1_Click(B yVal sender As Object, ByVal e As
System.EventArg s) Handles Button1.Click
ClearAllDropDow nList(Me)
End Sub

Public Sub ClearAllDropDow nList(ByVal parent As Control)
For Each ctl As Control In parent.Controls
If TypeOf ctl Is DropDownList Then
CType(ctl, DropDownList).I tems.Clear()
Else
For Each subctl As Control In ctl.Controls
ClearAllDropDow nList(subctl)
Next
End If
Next
End Sub

Hope this helps. Please feel free to post here if anything is unclear.

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no rights.

[Dave H]

Thanks Walter.

My problem turned out to be the hierarchy of the control.

Using a MasterPage the parent was really the ContentControl. .. so I just
changed the code to:

oParent = CType(oParent.F indControl("Con tentPlaceHolder 1"),
ContentPlaceHol der)

Then it worked normally..

Maybe not the best way, but it got me past the problem..


"Walter Wang [MSFT]" <wa****@online. microsoft.com> wrote in message
news:uz******** ******@TK2MSFTN GXA01.phx.gbl.. .

Thanks Steve for you informative input.

Hi Dave,

Based on my understanding, you question is how to use a generic method to
iterate child controls on a form and clear all DropDownList's items. If
I've misunderstood anything, please feel free to post here.

Protected Sub Button1_Click(B yVal sender As Object, ByVal e As
System.EventArg s) Handles Button1.Click
ClearAllDropDow nList(Me)
End Sub

Public Sub ClearAllDropDow nList(ByVal parent As Control)
For Each ctl As Control In parent.Controls
If TypeOf ctl Is DropDownList Then
CType(ctl, DropDownList).I tems.Clear()
Else
For Each subctl As Control In ctl.Controls
ClearAllDropDow nList(subctl)
Next
End If
Next
End Sub

Hope this helps. Please feel free to post here if anything is unclear.

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no
rights.

[Walter Wang [MSFT]]

Hi Dave,

Thank you for your update.

Besides using your way to find the ContentPlaceHol der control and get the
child controls, I think using the recursive way to find the DropDownList
should work too since when compiled, the master page and the content page
will get merged.

You can verify this by turning on trace output of the content page:

<%@ Page Language="VB" MasterPageFile= "~/MasterPage.mast er"
AutoEventWireup ="false" CodeFile="Defau lt2.aspx.vb" Inherits="Defau lt2"
title="Untitled Page" Trace="true" %>

And view the page, you will see the control hierarchy such as:

__Page ASP.default2_as px 1411 0 0
ctl00 ASP.masterpage_ master 1411 0 0
ctl00$ctl02 System.Web.UI.L iteralControl 175 0 0
ctl00$ctl00 System.Web.UI.H tmlControls.Htm lHead 46 0 0
ctl00$ctl01 System.Web.UI.H tmlControls.Htm lTitle 33 0 0
ctl00$ctl03 System.Web.UI.L iteralControl 14 0 0
aspnetForm System.Web.UI.H tmlControls.Htm lForm 1156 0 0
ctl00$ctl04 System.Web.UI.L iteralControl 21 0 0
ctl00$ContentPl aceHolder1
System.Web.UI.W ebControls.Cont entPlaceHolder 746 0 0
ctl00$ContentPl aceHolder1$ctl0 0
System.Web.UI.L iteralControl 21 0 0
ctl00$ContentPl aceHolder1$Drop DownList1
System.Web.UI.W ebControls.Drop DownList
So passing "Me" to the function I've written will correctly walk down all
the child controls.

Hope this helps. Please feel free to post here if anything is unclear.

Regards,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

=============== =============== =============== =====
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=============== =============== =============== =====

This posting is provided "AS IS" with no warranties, and confers no rights.