c# - Linq to Objects 按任意数量的参数排序

Question

我有一个 Func 列表定义了一个顺序:

var ordering = new List<Func<Person, IComparable>> 
                 { x => x.Surname, x => x.FirstName };

我可以用类似...的方式排序结果

people = people.OrderBy(ordering[0]).ThenBy(ordering[1]);

当列表可以包含任意数量的顺序排序时，我正在尝试弄清楚如何执行上述操作。可能吗？

Answer 1

people = people.OrderBy(ordering[0]).ThenBy(ordering[1]).ThenBy(ordering[2]);

与

相同

var orderedPeople = people.OrderBy(ordering[0]);
orderedPeople = orderedPeople.ThenBy(ordering[1]);
orderedPeople = orderedPeople.ThenBy(ordering[2]);
people = orderedPeople;

所以你只需像这样写一个循环:

if (ordering.Count != 0)
{
    var orderedPeople = people.OrderBy(ordering[0]);
    for (int i = 1; i < ordering.Count; i++)
    {
        orderedPeople = orderedPeople.ThenBy(ordering[i]);
    }
    people = orderedPeople;
}