public class TextBoxDerived : System.Web.UI.WebControls.TextBox
{
protected override void OnLoad(EventArgs e)
{
this.Controls.Add(new LiteralControl("Hello"));
}
}
The above code does not seem to do anything?
I was hoping something like
Hello
<input type"textbox" />
to be rendered in HTML.
A TextBox is not a CompositeControl, so it's children won't be rendered automatically.
What you could do, for example, is overwriting the Render method and manually rendering the control beforehand.
If you want to, as I assume, provide a textbox label and not some literal content, maybe using a HtmlGenericControl with a span or div tag would be more suitable, in order to automatically render escaped text.
protected override void Render(HtmlTextWriter writer)
{
var label = new HtmlGenericControl("span");
label.InnerText = "Hello";
label.RenderControl(writer);
base.Render(writer);
}
CompositeControl - by default WebControl also renders its child controls. I took a look at the TextBox Render() method in Reflector and see that it doesn't actually call base.Render() (which would render the child controls), but instead manually renders the begin tag, text and end tag.