How to render ControlStyle and other standard attributes?

[Ken Baltrinic]

I am writing a control that inherits from WebControl. It will be rendered
as a text box, image, and an iframe wrapped in span. Now here is my
problem. I want to render the entire contents more or less myself (i.e
override the Render method) for reasons to complex to explain here.
Everything I want to do is straight forward except for one item. My control
inherits all sorts of standard at WebControl properties, especially the ones
encapsulated in the ControlStyle property. Is there a method somewhere that
will convert the ControlStyle property to the appropriate string (i.g.
"style=\"height: 20px; width:75px\"" or perhas a method that I pass a
writter to and a style and it will call the AddAttribute() method, or
something of this sort. Basically I am trying to avoid coding a method to
build the style attribute from scratch.

 

[Teemu Keiski]

ControlStyle property exposes System.Web.UI.WebControls.Style type, and it
has AddAttributesToRender method, to which you can pass the HtmlTextWriter
instance.

Code could look something like:

if (this.ControlStyleCreated && !this.ControlStyle.IsEmpty)
{
this.ControlStyle.AddAttributesToRender(writer, this);
}

If you use v1.0, AddAttributesToRender signature might not take the owner,
and either of these properties to check for empty style could be non-public.