(I'm posting this question here cause I think it is an advanced issue)
For whose who don't know, when you add code inside some runat="server" tag,
the control receives a delegate (a RenderMethod delegate to be more
precise). The control should not render in it's normal way as it should
first check if someone provided a RenderMethod delegate before rendering.
To know how things work I subclassed a HtmlGenericControl and added some
code contents, like this:
<form id="Form1" method="post" runat="server">
<www:webcustomcontrol1 runat="server" id="cont">
<% = "hello" %>
<p> </p>
<INPUT type="button" value="Button">
</www:webcustomcontrol1>
</form>
(the control should render itself as a SPAN tag). ASP.Net generated the
usual method for the delegate:
private void __Rendercont(System.Web.UI.HtmlTextWriter __output,
System.Web.UI.Control parameterContainer)
{
__output.Write("\r\n\t\t\t\t");
__output.Write("hello");
__output.Write("\r\n\t\t\t\t<p> </p>\r\n\t\t\t\t<INPUT
type=\"button\" value=\"Button\" />\r\n\t\t\t");
}
So far, so good. As the Page's render begins, it calls the public
RenderControl(output) method that should call RenderChildren and recursively
render all controls.
But, wait! How things should work when they reach my control?
My-brain output begins:
The recursive call into RenderControl of my control begins
The control have a render delegate, so invoke it
ASP.Net generated render method is called
Render finished for the control (every child control should be handled in
the render method)
End of my-brain output
I'm believer that it is the way rendering works for controls with render
methods hidden by render delegates. But, I notice something strage. Where is
the call to the control render method? In this case it should render a SPAN
tag - and it does! - but where? And if someone provide (override) the render
method and write something like:
protected override void Render(HtmlTextWriter output)
{
output.WriteBeginTag... etc
output.WriteSomethingElse etc
output.WriteEndTag...
}
Where's the render method fits? Nowhere, I think.
Well, it's friday. Maybe the answer is jumping in front of me right now, but
I can't see it - maybe the answer is the RenderChildren... Any thoughts?
Regards,
hammett
MCAD
