Ok, what is wrong with this example from the SDK? Invalid Cast exception
at the line marked ***. Do you have a working example or a pointer to
one :)
<%@ Page language="c#" %>
<html>
<head>
<script language="C#" runat="server">
void Page_Load(object sender, System.EventArgs
e)
{
Button myButton =
(Button)ParseControl("<asp:button runat = \"server\"/>"); //***
myButton.Text = "Hello World!";
Controls.Add(myButton);
}
private void button_OnClick(object sender,
System.EventArgs e)
{
}
</script>
</head>
</html>
-----Original Message-----
From: Moderated discussion of advanced .NET topics.
[mailto:[EMAIL PROTECTED]] On Behalf Of Kirk Allen
Evans
Sent: 17 September 2002 18:51
To: [EMAIL PROTECTED]
Subject: Re: [ADVANCED-DOTNET] Controls, .Net and Xslt insanity
No, it is a string. Retrieve your output from the transformation as a
string, and parsecontrol can load that string in. The example in the
SDK is actually a good representation of how to do it, since it is
simple. The key is to get the XSLT out as a string so that it can be
loaded into Page.ParseControl.
Remember to either have a form element declared in the .ASPX page and
add controls to it, or dynamically add it and use Page.Controls.Add
method to add the form and its child controls.
Kirk Allen Evans
http://www.xmlandasp.net
Author, "XML And ASP.NET", New Riders Publishing
http://www.amazon.com/exec/obidos/ASIN/073571200X
> -----Original Message-----
> From: Moderated discussion of advanced .NET topics. [mailto:ADVANCED-
> [EMAIL PROTECTED]] On Behalf Of Steven Livingstone
> Sent: Tuesday, September 17, 2002 1:28 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [ADVANCED-DOTNET] Controls, .Net and Xslt insanity
>
> Hi Kirk -
> Yep - that is exactly the way I want to do it. Any good examples of
> working with the ParseControl? The MSDN ones fail with a cast
exception.
> The LoadControl() would be cool if it took a MemoryStream - but it
> doesn't :(
>
> I think that if Xslt was better integrated with the IDE we could have
> pretty powerful server controls. I've stayed away from server
> controls, but now I am finding the fun in trying to work with them
> with the Xslt knowledge I have.
>
> Thanks,
> Steven
>
> -----Original Message-----
> From: Moderated discussion of advanced .NET topics.
> [mailto:[EMAIL PROTECTED]] On Behalf Of Kirk Allen
> Evans
> Sent: 17 September 2002 18:01
> To: [EMAIL PROTECTED]
> Subject: Re: [ADVANCED-DOTNET] Controls, .Net and Xslt insanity
>
>
> One way to do this is to use the Page.ParseControl and Controls.Add
> methods to load the controls that are dynamically created. The
downside
> to the approach is that the web forms controls are prefixed with
"asp:",
> but the page has no namespace declaration associated with the
namespace
> prefix "asp". So, you have to fake one in your XSLT, then remove it
so
> that Page.ParseControl doesn't throw an exception. So, you have to
> implement some sort of a post-processor on your XSLT result as a
string
> to remove the xmlns declaration for the dummy namespace bound to the
asp
> prefix, but leaving the asp prefix on all nodes. Or, you can output
> elements as HTML with an additional "runat='server'" attribute and
pass
> them into the Page.ParseControl method, enabling them to become HTML
> server controls. Performance takes a hit, but I couldn't pinpoint any
> huge glaring performance issues with small test sets.
>
> Personally, I prefer a mixed approach, using XML to load into DataSets
> that are bound to UI elements as well as to use XSLT for limited
display
> areas instead of entire pages.
>
> Kirk Allen Evans
> http://www.xmlandasp.net
> Author, "XML And ASP.NET", New Riders Publishing
> http://www.amazon.com/exec/obidos/ASIN/073571200X
>
> > -----Original Message-----
> > From: Moderated discussion of advanced .NET topics.
[mailto:ADVANCED-
> > [EMAIL PROTECTED]] On Behalf Of Steven Livingstone
> > Sent: Tuesday, September 17, 2002 12:02 PM
> > To: [EMAIL PROTECTED]
> > Subject: [ADVANCED-DOTNET] Controls, .Net and Xslt insanity
> >
> > Ok, even after taking time out again to think about this issue I
feel
> I
> > need some view and opinions.
> > Creating web controls in .Net - when and how?
> >
> > For years now I have almost without exception used Xslt to generate
> the
> > output for forms and content alike. Now, with web controls there is
> the
> > mixed content and code, some of which I don't like all that much. To
> > generate a menu for example, I would be more tempted to write the
code
>
> > to use Xslt to transform the data. The idea of writing out table
> > elements in C# code with javascript inserted as strings is not at
all
> > appealing.
> >
> > When it comes to forms, it is more appealing as you can get state
> > management and validation - both of which are a pain to manage in
> Xslt.
> > Still you have the annoying need to write out table elements and
form
> > elements (e.g. output.Write("<td class='clsMenuBarCell' nowrap>");)
> >
> > I have hit one of those mind block days where I am arguing with
myself
>
> > over the better way to do things, so it's out to the jury to let me
> know
> > what you have been doing.
> > I'm pretty sure the best way is some combination - this would
ideally
> be
> > a way of still getting state management and validation, with OO, but
> > being able to separate the display from the Asp.Net, but this
doesn't
> > seem possible.
> >
> > I also dislike the idea of transforming to an aspx page and then
> loading
> > that.
> >
> > Has anyone looked at in memory dynamic compilation? In other words,
> > still having your xslt's that can be loaded. These transform to an
> aspx
> > output in memory that is dynamically returned so that you can still
> get
> > all the benefits of state management and validation methods? An
> example
> > may be:
> >
> > - user vists page
> > - aspx page generates form using Xml data and Xslt to create aspx
code
> > - user submits data
> > - aspx code behind validates and maintains viewstate
> > - in memory aspx output section is modified by code-behind (e.g.
> > label.Text="Invalid Telephone Number")
> > - result is sent to the output
> >
> > Thanks,
> > Steven.
> >
> >
> > ==========================================================
> > Steven Livingstone BSc (hons), PgDip ITS
> [[EMAIL PROTECTED]]
> > .Net & Xml Consultant
> >
> > Change your business at http://www.deltabis.net
> > Grow your business at http://www.venturetogether.com
> > Change European Football at http://www.theatlanticleague.com
> >
> > *** Author of "Application Development with MSXML 4.0"
> > *** Coming Soon to a developer near you...
> > "Beg VB.NET XML:Essential XML Skills for VB.NET Programmers" "Beg C#
> > XML:Essential XML Skills for C# Programmers"
> > ==========================================================
> >
> > You can read messages from the Advanced DOTNET archive, unsubscribe
> from
> > Advanced DOTNET, or
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http://discuss.develop.com.
>
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