public static void AddMissing <T>(this SortableObservableCollection <T> list, IEnumerable <T> items, IEqualityComparer <T> comp, SynchronizationContext context)
{
if (list == null)
{
throw new ArgumentNullException("list");
}
if (items == null)
{
throw new ArgumentNullException("items");
}
foreach (var item in items)
{
var sought = list.FirstOrDefault(el => comp.Equals(el, item));
if (sought == null)
{
context.Send(x => list.Add(item), null);
}
}
}
public static void AddRange <T>(this SortableObservableCollection <T> list, IEnumerable <T> items)
{
if (list == null)
{
throw new ArgumentNullException("list");
}
if (items == null)
{
throw new ArgumentNullException("items");
}
if (list is List <T> )
{
((SortableObservableCollection <T>)list).AddRange(items);
}
else
{
foreach (var item in items)
{
list.Add(item);
}
}
}
public static void AddMissing <T>(this SortableObservableCollection <T> list, IEnumerable <T> items, IEqualityComparer <T> comp)
{
AddMissing(list, items, comp, null);
}