Checkbox control is not firing RenderBeginTag

Question

User-2092341045 posted

Hello.

I'm to add some custom attributes to a custom checkbox control, but I'm getting stuck because the base CheckBox control is behaving weird (I guess).

I tested several ways to add the attribute, but for this post I'll say that RenderBeginTag() is not being executed. See:

    public class CheckBox : System.Web.UI.WebControls.CheckBox
    {
        public override void RenderBeginTag(HtmlTextWriter writer)
        {
            base.RenderBeginTag(writer); // <== NOTE: I added a breakpoint here
            writer.WriteAttribute("MyAttribute", "someValue");
        }
    }
 

Note I added a breakpoint to check if it is working. It is not! When I run the page hosting the control, the process never breaks in the breakpoint I defined.

NOTE 1: To test if I'm not crazy, I added the breakpoints to another overrides, and it works well. The only overrides I noticed are not working are RenderBeginTag() and RenderEndTag().

NOTE 2: This issue happen only with CheckBox. Buttons, for example, are working fine in my tests.

NOTE 3: AddAttributesToRender() also don't work for the CheckBox, because it is producing a span tag out of the control. See:

    <span MyAttribute="someValue">
        <input id="CheckBox2" type="checkbox" name="CheckBox2" />
        <label for="CheckBox2">MyCheckBox</label>
    </span> 

 

Do you know how can I add my custom attributes to my custom CheckBox, like the sample below?

    <input id="CheckBox2" type="checkbox" name="CheckBox2" MyAttribute="someValue" />

I hope I dont need to full override the RenderControl(), hehe. I want to enjoy all the working features of CheckBox control.