Hi,
I want to process all controls on a page, to check for a specific attribute
(a specific custom attribute I added).
I try with the following code
Dim oCtrl As WebControls.WebControl
For Each oCtrl In Page.Controls
If oCtrl.Attributes("bzDisable") = "1" Then
oCtrl.Enabled = false
End If
Next
bzDisable is a custom attribute I added to Textbox control in .ASPX page
and it gives me this error:
Exception Details: System.InvalidCastException: Specified cast is not valid.
Can anyone tell me what I did wrong?
Thank you.
Bogdan 4 1944
"Bogdan Zamfir" <ams_soft at pcnet dot ro> wrote in message
news:ur**************@tk2msftngp13.phx.gbl... Hi,
I want to process all controls on a page, to check for a specific
attribute (a specific custom attribute I added).
I try with the following code Dim oCtrl As WebControls.WebControl
For Each oCtrl In Page.Controls
If oCtrl.Attributes("bzDisable") = "1" Then
oCtrl.Enabled = false
End If
Next
Page.Controls is a collection of Control objects, not of WebControl objects.
--
John Saunders
Internet Engineer jo***********@surfcontrol.com
Okay, first of all, starting at Page level is going to return a bunch of
LiteralControls with the HTML for the page in them, and your WebForm, which
is NOT the Page, but the form in the Page. If you want to get all the
Controls on the Form, use:
Dim objControl As Control
For Each objControl in Page.FindControl("Form1").Controls
Then you need to ascertain that the Control is a WebControl. If the Form has
any HTML in it, it will also be converted to LiteralControls. However, if
you start with a type of Control, you can use Reflection if necessary, and
cast it to whatever type you need to look at.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer http://www.takempis.com
Neither a follower nor a lender be.
"Bogdan Zamfir" <ams_soft at pcnet dot ro> wrote in message
news:ur**************@tk2msftngp13.phx.gbl... Hi,
I want to process all controls on a page, to check for a specific
attribute (a specific custom attribute I added).
I try with the following code Dim oCtrl As WebControls.WebControl
For Each oCtrl In Page.Controls
If oCtrl.Attributes("bzDisable") = "1" Then
oCtrl.Enabled = false
End If
Next
bzDisable is a custom attribute I added to Textbox control in .ASPX page
and it gives me this error: Exception Details: System.InvalidCastException: Specified cast is not
valid. Can anyone tell me what I did wrong?
Thank you. Bogdan
Hi
See below
"Kevin Spencer" <ke***@takempis.com> wrote in message
news:ee***************@TK2MSFTNGP09.phx.gbl... Okay, first of all, starting at Page level is going to return a bunch of LiteralControls with the HTML for the page in them, and your WebForm,
which is NOT the Page, but the form in the Page. If you want to get all the Controls on the Form, use:
Dim objControl As Control For Each objControl in Page.FindControl("Form1").Controls
Then you need to ascertain that the Control is a WebControl. If the Form
has any HTML in it, it will also be converted to LiteralControls. However, if you start with a type of Control, you can use Reflection if necessary, and cast it to whatever type you need to look at.
1. What is Reflection and what is it used for?
2. What is LiteralControls and how does that differentiate from our normal
web controls?
Cheers
J -- HTH,
Kevin Spencer Microsoft MVP .Net Developer http://www.takempis.com Neither a follower nor a lender be.
"Bogdan Zamfir" <ams_soft at pcnet dot ro> wrote in message news:ur**************@tk2msftngp13.phx.gbl... Hi,
I want to process all controls on a page, to check for a specific attribute (a specific custom attribute I added).
I try with the following code Dim oCtrl As WebControls.WebControl
For Each oCtrl In Page.Controls
If oCtrl.Attributes("bzDisable") = "1" Then
oCtrl.Enabled = false
End If
Next
bzDisable is a custom attribute I added to Textbox control in .ASPX page
and it gives me this error: Exception Details: System.InvalidCastException: Specified cast is not valid. Can anyone tell me what I did wrong?
Thank you. Bogdan
Hi James, 1. What is Reflection and what is it used for?
The System.Reflection namespace is a set of classes that are used to
discover information about .Net classes and assemblies. You can find out
anything you want to about any class or assembly using these classes.
2. What is LiteralControls and how does that differentiate from our normal web controls?
A LiteralControl is a Control which contains only Text. It can contain HTML
or any other type of plain text. When a Page is parsed, all HTML in the Page
that is not part of a Control is converted to LiteralControls.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer http://www.takempis.com
Neither a follower nor a lender be.
"James Zhuo" <na**************@optusnet.com.au> wrote in message
news:Oa**************@TK2MSFTNGP12.phx.gbl... Hi
See below
"Kevin Spencer" <ke***@takempis.com> wrote in message news:ee***************@TK2MSFTNGP09.phx.gbl... Okay, first of all, starting at Page level is going to return a bunch of LiteralControls with the HTML for the page in them, and your WebForm, which is NOT the Page, but the form in the Page. If you want to get all the Controls on the Form, use:
Dim objControl As Control For Each objControl in Page.FindControl("Form1").Controls
Then you need to ascertain that the Control is a WebControl. If the Form has any HTML in it, it will also be converted to LiteralControls. However,
if you start with a type of Control, you can use Reflection if necessary,
and cast it to whatever type you need to look at.
1. What is Reflection and what is it used for? 2. What is LiteralControls and how does that differentiate from our normal web controls?
Cheers
J
-- HTH,
Kevin Spencer Microsoft MVP .Net Developer http://www.takempis.com Neither a follower nor a lender be.
"Bogdan Zamfir" <ams_soft at pcnet dot ro> wrote in message news:ur**************@tk2msftngp13.phx.gbl... Hi,
I want to process all controls on a page, to check for a specific attribute (a specific custom attribute I added).
I try with the following code Dim oCtrl As WebControls.WebControl
For Each oCtrl In Page.Controls
If oCtrl.Attributes("bzDisable") = "1" Then
oCtrl.Enabled = false
End If
Next
bzDisable is a custom attribute I added to Textbox control in .ASPX
page and it gives me this error: Exception Details: System.InvalidCastException: Specified cast is not valid. Can anyone tell me what I did wrong?
Thank you. Bogdan
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