C# Enumerable OrderByDescending(IEnumerable, Func, IComparer)
Description
Sorts the elements of a sequence in descending order by using a specified comparer.
Syntax
public static IOrderedEnumerable<TSource> OrderByDescending<TSource, TKey>(
this IEnumerable<TSource> source,
Func<TSource, TKey> keySelector,
IComparer<TKey> comparer//w w w . j a va 2 s . co m
)
Parameters
TSource- The type of the elements of source.TKey- The type of the key returned by keySelector.source- A sequence of values to order.keySelector- A function to extract a key from an element.comparer- An IComparerto compare keys.
Example
The following code example demonstrates how to use OrderByDescending to sort the elements of a sequence in descending order by using a transform function and a custom comparer.
// w w w. j a va 2 s . c o m
using System;
using System.Linq;
using System.Collections.Generic;
public class MainClass{
public static void Main(String[] argv){
List<decimal> decimals = new List<decimal> { 61.2m, 81.3m, 10.5m, 11.3m, 16.3m, 19.7m };
IEnumerable<decimal> query =
decimals.OrderByDescending(num =>
num, new SpecialComparer());
foreach (decimal num in query)
{
Console.WriteLine(num);
}
}
}
public class SpecialComparer : IComparer<decimal>
{
public int Compare(decimal d1, decimal d2)
{
return Decimal.Compare(d1, d2);
}
}
The code above generates the following result.
