public T this[int index]
{
get
{
lock (_sync)
{
return(FilteredList.ElementAt(index));
}
}
set
{
if (IsReadOnly)
{
throw new InvalidOperationException("List is locked");
}
lock (_sync)
{
var i = List.IndexOf(this[index]);
if (i < 0)
{
return;
}
List[i] = value;
}
Changed();
}
}