protected override object ConvertValue(object newValue)
{
List <ItemType> selectedItems = new List <ItemType>();
var vals = newValue.ToString().Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
selectedItems.AddRange(Items.Where(i => vals.Any(v => v == GetItemKey(i))));
return(vals.ToList().Select(value => (ValueType)SemDataSelectControlHelper <ItemType, ValueType> .ConvertValue(value, Items, ItemKey, ValueSelector)).ToList());
}
protected override object ConvertValue(object newValue) => SemDataSelectControlHelper <ItemType, ValueType> .ConvertValue(newValue, Items, ItemKey, ValueSelector);
