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From: Nathan Sokalski on 3 Apr 2010 01:05
I have a custom control that I would like to have add style rules to the
Page that contains it. I know how to do this, using the following method:

Me.Page.Header.StyleSheet.CreateStyleRule

However, I only want to add the style rule once, since it is the same for
every instance of the custom control. When adding scripts, I would simply
use the following two statements to add a script and check whether it was
already added:

Me.Page.ClientScript.RegisterClientScriptBlock
Me.Page.ClientScript.IsClientScriptBlockRegistered

But I could not find anything like this for stylesheets. What would be the
best way to have a custom control add a style rule and make sure it is only
added once? Thanks.
--
Nathan Sokalski
njsokalski(a)hotmail.com
http://www.nathansokalski.com/

From: Nathan Sokalski on 4 Apr 2010 11:25
I think I may have found a solution. Here is the code I added:

At the beginning with the other declarations, declare the HtmlLink as a
Shared property:

Private Shared linktag As New HtmlLink

Then check whether this control exists in the header controls:

If Not Me.Page.Header.Controls.Contains(linktag) Then
CSSImageMap.linktag.Attributes.Add("rel", "stylesheet")
CSSImageMap.linktag.Attributes.Add("type", "text/css")
CSSImageMap.linktag.Href = "mystyle.css"
Me.Page.Header.Controls.Add(linktag)
End If

If anybody as any comments on this technique (or if I am missing something
that would cause a problem in it), I would greatly appreciate it. Thanks.
--
Nathan Sokalski
njsokalski(a)hotmail.com
http://www.nathansokalski.com/

"Nathan Sokalski" <njsokalski(a)hotmail.com> wrote in message
news:ECB61505-410C-4F29-B8C0-4B0383FC725A(a)microsoft.com...
> I have a custom control that I would like to have add style rules to the
> Page that contains it. I know how to do this, using the following method:
>
> Me.Page.Header.StyleSheet.CreateStyleRule
>
> However, I only want to add the style rule once, since it is the same for
> every instance of the custom control. When adding scripts, I would simply
> use the following two statements to add a script and check whether it was
> already added:
>
> Me.Page.ClientScript.RegisterClientScriptBlock
> Me.Page.ClientScript.IsClientScriptBlockRegistered
>
> But I could not find anything like this for stylesheets. What would be the
> best way to have a custom control add a style rule and make sure it is
> only added once? Thanks.
> --
> Nathan Sokalski
> njsokalski(a)hotmail.com
> http://www.nathansokalski.com/

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