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Issue with generating RadCombobox ItemTemplate dynamically

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ComboBox
This is a migrated thread and some comments may be shown as answers.
khashayar
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khashayar asked on 01 Feb 2017, 02:48 PM
Hello Telerik Team
I have a usercontrol.ascx in which I have put a RadComboBox.
I am trying to generate the RadComboBoxItems and HeaderTemplate and ItemTemplate dynamically.
I have succeded in generating the HeaderTemplate.
But I have an issue in ItemTemplate generation.
I have tried the following Code in the usercontrol.ascx where ‘drpLookup’ is the RadComboBox ID:

protected override void OnPreRender(EventArgs e)
        {
            if (!IsPostBack)
            {
                drpLookup.Attributes.Add("LookupType", LookupType);
                drpLookup.Attributes.Add("ServiceClass", ServiceClass);
            }
            HeaderTemplate.ServiceClass = drpLookup.Attributes["ServiceClass"];
            ItemTemplate.ServiceClass = drpLookup.Attributes["ServiceClass"];
            base.OnPreRender(e);
        }
protected override void OnInit(EventArgs e)
        {
            drpLookup.HeaderTemplate = new HeaderTemplate();
            drpLookup.ItemTemplate = new ItemTemplate();
            base.OnInit(e);
        }
protected void drpLookup_ItemsRequested(object sender, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e)
        {
                     Datatable dt=//some code to get data
                     BindDrpLookup(dt, properties, DataValueFieldName, DataTextFieldName);
        }
private void BindDrpLookup(DataTable dataTable, List<PropertyInfo> properties, string DataValueFieldName, string DataTextFieldName)
        {
            drpLookup.DataValueField = DataValueFieldName;
            drpLookup.DataTextField = DataTextFieldName;

            foreach (DataRow l in dataTable.Rows)
            {
                RadComboBoxItem item = new RadComboBoxItem();

                foreach (var p in properties)
                {
                    item.Attributes.Add(p.Name, l[p.Name].ToString());
                }
                drpLookup.Items.Add(item);
  item.DataBind();
            }
            drpLookup.DataBind();

        }


private class ItemTemplate : ITemplate
        {
            public static string ServiceClass { get; set; }
            public void InstantiateIn(Control container)
            {
                PropertyInfo propertyWithLookupValue =//Do Some Code To get values

                HtmlTable table = new HtmlTable();
                table.Width = "100%";
                table.CellPadding = 0;
                table.CellSpacing = 0;
                HtmlTableRow row = new HtmlTableRow();
                row.Style.Add("width", "100%");
                int numberofColumns = propertiesWithLookup.Count - 1;
                string ColumnWidth = Math.Round((decimal)(100 / numberofColumns)).ToString();
                foreach (PropertyInfo p in propertiesWithLookup)
                {
                    if (p != propertyWithLookupValue)
                    {
                        HtmlTableCell cell = new HtmlTableCell();
                        cell.Width = ColumnWidth + "%";
                        cell.ID = p.Name;
                        cell.DataBinding += new EventHandler(cell_DataBinding);
                        row.Controls.Add(cell);
                    }
                }
                table.Controls.Add(row);
                container.Controls.Add(table);
            }

            private void cell_DataBinding(object sender, EventArgs e)
            {
                HtmlTableCell target = (HtmlTableCell)sender;
                RadComboBoxItem item = (RadComboBoxItem)target.BindingContainer;
                string[] id = target.ClientID.Split('_');
string itemText = (string)DataBinder.Eval(item, id[id.Length - 1].ToString());
                target.InnerText = itemText;
            }
        }



The issue is that in the cell_DataBinding event at the following line of Code:
string itemText = (string)DataBinder.Eval(item, id[id.Length - 1].ToString());


I get an exception with the following Error message:
{"DataBinding: 'Telerik.Web.UI.RadComboBoxItem' does not contain a property with the name 'Name'."}

And following stacktrace:

   at System.Web.UI.DataBinder.GetPropertyValue(Object container, String propName)
   at System.Web.UI.DataBinder.Eval(Object container, String[] expressionParts)
   at System.Web.UI.DataBinder.Eval(Object container, String expression)
   at APA.UI.Web.APAAdmin.Views.UserControls.Lookup.ItemTemplate.cell_DataBinding(Object sender, EventArgs e) in D:\Projects\Framework\2015\APA\APA.UI.Web.APAAdmin\Views\UserControls\Lookup.ascx.cs:line 217
   at System.Web.UI.Control.OnDataBinding(EventArgs e)
   at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
   at System.Web.UI.Control.DataBind()
   at System.Web.UI.Control.DataBindChildren()



any helps will be very much appreciated !

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khashayar
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