private SelectListGroup GetGroup(object container)
{
if (_groups == null)
{
return(null);
}
var groupName = Eval(container, DataGroupField);
if (string.IsNullOrEmpty(groupName))
{
return(null);
}
// We use StringComparison.CurrentCulture because the group name is used to display as the value of
// optgroup HTML tag's label attribute.
var group = _groups.FirstOrDefault(g => string.Equals(g.Name, groupName, StringComparison.CurrentCulture));
if (group == null)
{
group = new SelectListGroup()
{
Name = groupName
};
_groups.Add(group);
}
return(group);
}
public CustomerViewModel()
{
var germanGroup = new SelectListGroup {Name = "German Cars"};
var swedishGroup = new SelectListGroup { Name = "Swedish Cars" };
Vehicles = new List<SelectListItem>
{
new SelectListItem
{
Value = "audi",
Text = "Audi",
Group = germanGroup
},
new SelectListItem
{
Value = "mercedes",
Text = "Mercedes",
Group = germanGroup
},
new SelectListItem
{
Value = "saab",
Text = "Saab",
Group = swedishGroup
},
new SelectListItem
{
Value = "volvo",
Text = "Volvo",
Group = swedishGroup
}
};
}
