public static System.Linq.IOrderedEnumerable <TSource> ThenByDescending <TSource, TKey>(this System.Linq.IOrderedEnumerable <TSource> source, Func <TSource, TKey> keySelector, IComparer <TKey> comparer)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
return(source.CreateOrderedEnumerable(keySelector, comparer, true));
}
public static System.Linq.IOrderedEnumerable <TSource> ThenBy <TSource, TKey>(this System.Linq.IOrderedEnumerable <TSource> source, Func <TSource, TKey> keySelector)
{
if (source == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
}
return(source.CreateOrderedEnumerable(keySelector, null, false));
}
public static System.Linq.IOrderedEnumerable <TSource> ThenBy <TSource, TKey>(
this System.Linq.IOrderedEnumerable <TSource> source,
Func <TSource, TKey> keySelector,
IComparer <TKey> comparer)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (keySelector == null)
{
throw new ArgumentNullException(nameof(keySelector));
}
return(source.CreateOrderedEnumerable(keySelector, comparer, false));
}