How to Override LoadPostData

Question

User764522383 posted

Im overriding a RadioButton , but here is the problem I can not have base Properties in my codeBehind & also can not have the checked property its alwasys true,

problem is from LoadPostData how should I override this.

 

namespace CRS.Web.UI.WebControls
{
	
    [ToolboxData("&lt;{0}:GroupRadioButton runat=server></{0}:GroupRadioButton>")]
    public class GroupRadioButton : RadioButton, IPostBackDataHandler
    {
        private string tmpID;

        public GroupRadioButton()
            : base()
        {

        }
        public GroupRadioButton(string RadioButtonValue, string RadioButtonText, System.Drawing.Color TextForeColor)
        {
            this.Text = RadioButtonText;
            this.ForeColor = TextForeColor;
            this.RadioButtonValue = RadioButtonValue;
            this.Checked = Checked;
        }
        public GroupRadioButton(string RadioButtonValue, string RadioButtonText)
        {
            this.Text = RadioButtonText;
            this.RadioButtonValue = RadioButtonValue;
            this.Checked = Checked;

        }
        #region Properties

        private string RadioButtonValue_;
        public string RadioButtonValue
        {
            get { return RadioButtonValue_; }
            set { RadioButtonValue_ = value; }
        }
        private string RadioID
        {
            get
            {
                string id = Attributes["id"];
                if (id == null)
                    id = UniqueID;
                else
                    id = UniqueID + "_" + id;
                return id;
            }
        }
        #endregion

        #region Rendering

        protected override void Render(HtmlTextWriter output)
        {
            RenderInputTag(output);
        }

        private void RenderInputTag(HtmlTextWriter htw)
        {
            /*************************************************************************/
            this.tmpID = this.UniqueID;
            this.tmpID = this.tmpID.Replace("$", "_");
            this.ID = this.tmpID;
            /*************************************************************************/

            htw.Write(string.Format("&lt;span style='color:{0};'>", this.ForeColor.Name));
            htw.AddAttribute(HtmlTextWriterAttribute.Id, this.ID);
            htw.AddAttribute(HtmlTextWriterAttribute.Type, "radio");
            htw.AddAttribute(HtmlTextWriterAttribute.Name, GroupName);
            htw.AddAttribute(HtmlTextWriterAttribute.Value, this.RadioButtonValue);

            if (Checked)
                htw.AddAttribute(HtmlTextWriterAttribute.Checked, "checked");
            if (!Enabled)
                htw.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");

            string onClick = Attributes["onclick"];
            if (AutoPostBack)
            {
                if (onClick != null)
                    onClick = String.Empty;
                onClick += Page.GetPostBackClientEvent(this, String.Empty);
                htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
                htw.AddAttribute("language", "javascript");
            }
            else
            {
                if (onClick != null)
                    htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
            }

            if (AccessKey.Length > 0)
                htw.AddAttribute(HtmlTextWriterAttribute.Accesskey, AccessKey);
            if (TabIndex != 0)
                htw.AddAttribute(HtmlTextWriterAttribute.Tabindex,
                    TabIndex.ToString(NumberFormatInfo.InvariantInfo));
            htw.RenderBeginTag(HtmlTextWriterTag.Input);
            htw.RenderEndTag();
            //Add Text Property For RadioButton
            htw.Write(string.Format("&lt;label for='{0}'>{1}</label>", this.ID, this.Text));
            //End Span tag for ForeColor
            htw.Write("&lt;/span>");

        }

        #endregion

        #region IPostBackDataHandler Members

        void IPostBackDataHandler.RaisePostDataChangedEvent()
        {
            OnCheckedChanged(EventArgs.Empty);
        }

        bool IPostBackDataHandler.LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
        {
            bool result = false;
            string ControlID = postCollection[GroupName];
            if ((ControlID != null) && (ControlID == RadioID))
            {
                if (!this.Checked)
                {
                    this.Checked = true;
                    result = true;
                }
            }
            else
            {
                if (this.Checked)
                    this.Checked = false;
            }
            return result;
        }

        #endregion
    }
}