public SorterComparer GetComparer(bool ascending)
{
lock (ComparerLock) {
PrepareSort();
if (ascending)
{
if (AscendingSorter == null)
{
AscendingSorter = new SorterComparer(this, ascending);
}
return(AscendingSorter);
}
else
{
if (DescendingSorter == null)
{
DescendingSorter = new SorterComparer(this, ascending);
}
return(DescendingSorter);
}
}
}
private void Invalidate()
{
lock (ComparerLock) {
AscendingSorter = null;
DescendingSorter = null;
}
}
public static ISorterEnumerable <TElement> ThenByDescending <TElement, TKey>(this ISorterEnumerable <TElement> source, Func <TElement, TKey> keySelector, IComparer <TKey> comparer)
{
var sourceComparer = source.Comparer;
var nextComparer = new SorterComparer <TElement, TKey>(comparer, keySelector, true);
sourceComparer.Next = nextComparer;
return(source);
}
public static ISorterEnumerable <TElement> SortByDescending <TElement, TKey>(this ParallelQuery <TElement> source, Func <TElement, TKey> keySelector, IComparer <TKey> comparer, ISorter <TElement> sorter)
{
var sorterComparer = new SorterComparer <TElement, TKey>(comparer, keySelector, true);
return(new SorterEnumerable <TElement>(source, sorterComparer, sorter, true));
}
public static ISorterEnumerable <TElement> SortBy <TElement, TKey>(this IEnumerable <TElement> source, Func <TElement, TKey> keySelector, IComparer <TKey> comparer, ISorter <TElement> sorter)
{
var sorterComparer = new SorterComparer <TElement, TKey>(comparer, keySelector, false);
return(new SorterEnumerable <TElement>(source, sorterComparer, sorter, false));
}
