Question

I have a dropdownlist which i’m binding to DataTable.

  ddlItems.DataSource = dt;
  ddlItems.DataBind();

in the final html I have :

...
<option value="-1">aaa</option>
<option value="-2">bbb</option>
...

But I want to catch the bind event in the DataBound event and to add an attribute to each listItem , so that the Final Html will be :

 ...
    <option value="-1" MyAttr="lalala1" >aaa</option>
    <option value="-2" MyAttr="lalala2" >bbb</option>
    ...

But the signiture of the databound event is :

  protected void ddlItemsDataBound(object sender, EventArgs e)

and e has only :

How can i catch the specific bounded listItem ?

p.s.

I do NOT want to cancel the databound event , and to use regular loop (adding lisItems in a loop)

Answer 1

DropDownList.DataBound event fires after DropDownList.DataBind() is called for the entire DropDownList.

DropDownList.Items are a ListItemCollection that have no events.

You will have to manually loop through the DropDownList.Items collection again or manually build the ListItemCollection and add it then.

NOTE: An alternative that you probably won’t like is to extend DropDownList and ListItemCollection and add the events you want.