垂直然后水平排序点 [英] Sort Points vertically then horizontally

问题描述

我有一个Points数组，我想对它进行垂直和水平排序.

I have an array of Points and i want to sort then both vertically and horizontally.

我应该排序两次吗?

推荐答案

不，您不能仅进行两次排序，因为.Net框架的Sort()算法是一种不稳定的排序，这意味着当您对项目进行排序时，它们的顺序是不考虑原始项的存在，也就是说，当两个项目相等时，它们相对于彼此的位置将是不确定的.

No you can't just sort twice because the .Net framework Sort() algorithm is an unstable sort, which means that when you sort items, the order they originaly were in is not taken into account, that is, when two items are equal, their position relative to each other will be undefined.

您需要做的是为您要排序的类实现一个自定义IComparer，并在对集合进行排序时使用该比较器:

What you will need to do is implement a custom IComparer for the class you are trying to sort and use that comparer when sorting your collection:

class PointComparer : IComparer<Point>
{
    public int Compare(Point x, Point y)
    {
        if (x.Y != y.Y)
        {
            return x.Y - y.Y;
        }
        else
        {
            return x.X - y.X;
        }
    }
}

用法:

List<Point> list = ...;
list.Sort(new PointComparer());

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