C# - 使用扩展方法排序

public static class ExtensionMethods
{
    public static IOrderedEnumerable<TSource> OrderBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
    {
        return source.OrderBy(keySelector, null);
    }

    public static IOrderedEnumerable<TSource> OrderByDescending<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
    {
        return source.OrderBy(keySelector, Comparer<TKey>.Default.Reverse());
    }
}

var numbers = new List<int> { 3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5 };

var sortedNumbers = numbers.OrderBy(n => n);

foreach (var number in sortedNumbers)
{
    Console.WriteLine(number);
}