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 } }; }