How to set checked property of CheckBoxList items in aspx markup?

I have a CheckBoxList in my page, with the DataTextField and DataValueField attributes set, is there an attribute that I can use to specify a property that indicates if it should be checked?

开发者_Python百科I'm hoping to just set the datasource, and not have to have any code behind to set the checked property. Possible?

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No it's not possible because the control uses the same binding as other controls such as ListBox, DropDownList, RadioButtonList, etc.

As per MSDN:

To set multiple selections in a list control programmatically loop through the control's Items collection and set the Selected property of every individual item.

You could implement the OnDataBinding of the CheckListBox and then do a lookup for each item that gets bound but it would probably just be easier to do it all in one place.

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lock at this example:

string[] strUserRoles = Roles.GetRolesForUser("Ali");
foreach (var item in Roles.GetAllRoles())
{
         chkRoleList.Items.Add(new ListItem()
         {
             Text = item,
             Value = item,
             Selected = strUserRoles.Contains(item)
         });
}

Note: when you bind CheckListBox, you must set Both of Text and Value of each Item.