I figured this out. You don't have to reply, but thanks for looking!
It turns out the info is posted back in the postCollection just not in a
normal format (and for some reason it isn't in ViewState and is not loaded up
by ASP.NET). It has to be parsed. The value in
postCollection[this.UniqueID + ":" + this.GroupName]
is the UniqueID of the radio button that is selected. So I added the
following to IPostBackDataHandler.LoadPostData
string postCollectionRadioButtonKey = this.UniqueID + ":" + this.GroupName;
string postedValue = postCollection[postCollectionRadioButtonKey];
if(postedValue != null)
{
foreach(Control thisControl in Controls)
{
if(thisControl.UniqueID == postedValue)
{
// this is the radio button that is checked,
// the ID is null so you have to check another
// property such as
// ((RadioButton) thisControl).Text
}
}
}
[quoted text, click to view] "Solel Software" wrote:
> Hi,
>
> I am having a problem with a custom server control I'm working on and put
> together a skeleton example to demonstrate the problem. Basically, I have a
> custom server control with two RadioButton controls added in
> CreateChildControls. They work great and all is well except for some reason
> their information is not available in IPostBackDataHandler.LoadPostData.
> I've gone through the ViewState and the postCollection argument to
> LoadPostData but haven't found the radio buttons' information there either.
> Is there something special that I have to do? For some reason, the
> information is not being stored in ViewState so it is not a LoadViewState
> issue (or maybe it is?). I _am_ able to access a TextBox and DropDownList's
> information in IPostBackDataHandler.LoadPostData so it seems to affect only
> RadioButton controls. The code for the bare-bones server control to
> illustrate the problem is below. Any help would be appreciated! Thanks so
> much!
>
> --
> Sincerely,
>
> Mark Fox
>
> public class TestRadio : System.Web.UI.Control, IPostBackDataHandler,
> INamingContainer
> {
> public TestRadio() : base() {}
>
> #region Implementation of IPostBackDataHandler
> void IPostBackDataHandler.RaisePostDataChangedEvent()
> {
> }
>
> bool IPostBackDataHandler.LoadPostData(string postDataKey,
> System.Collections.Specialized.NameValueCollection postCollection)
> {
> // HERE IS THE PROBLEM: both the RadioButtons have Checked == false
> // on postback even when one is selected
> RadioButton rb1 = (RadioButton) Controls[0];
> RadioButton rb2 = (RadioButton) Controls[1];
>
> return false;
> }
> #endregion
>
> #region Render Overrides
> protected override void CreateChildControls()
> {
> #region rb1
> _rb1 = new RadioButton();
> _rb1.GroupName = "DateSet";
> _rb1.CssClass = "Normal";
> _rb1.Text = "1";
> this.Controls.Add(_rb1);
> #endregion rb1
>
> #region rb2
> _rb2 = new RadioButton();
> _rb2.GroupName = "DateSet";
> _rb2.CssClass = "Normal";
> _rb2.Text = "2";
> this.Controls.Add(_rb2);
> #endregion rb2
> }
>
> protected override void Render( HtmlTextWriter writer )
> {
> this.EnsureChildControls();
> base.Render(writer);
> writer.AddAttribute(HtmlTextWriterAttribute.Type, "Hidden");
> writer.AddAttribute(HtmlTextWriterAttribute.Value, "");
> writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
> writer.RenderBeginTag(HtmlTextWriterTag.Input);
> writer.RenderEndTag();
> }
> #endregion
>
> protected internal RadioButton rb1
> {
> get { EnsureChildControls(); return _rb1; }
> }
> protected internal RadioButton rb2
> {
> get { EnsureChildControls(); return _rb2; }
> }
> private RadioButton _rb1;
> private RadioButton _rb2;
