* 已解决 - 票务更新在底部 *
我有一个"line"对象列表,每个对象都有一个"StartPoint"和一个"EndPoint"属性。这些属性包含标准的点对象,每个点对象都有一个"X"、"Y"和"Z"成分。
使用Linq,我试图首先按照最小的端点Y值升序排序,然后按照最小的端点X值升序排序(当Y值匹配时)。
我认为以下代码会起作用:
var sortedList = linesList
.OrderBy(o => Math.Min(o.StartPoint.Y, o.EndPoint.Y))
.ThenBy(o => Math.Min(o.StartPoint.X, o.EndPoint.X));
foreach (Line thisLine in sortedList)
{
Console.WriteLine(thisLine.StartPoint + ", " + thisLine.EndPoint);
}
然而,这将产生以下顺序(写为xs、ys、zs、xe、ye、ze):
737.928, 825.293, 0, 737.928, 826.293, 0
737.616, 825.293, 0, 737.616, 826.293, 0
733.928, 825.293, 0, 733.928, 826.293, 0
733.616, 825.293, 0, 733.616, 826.293, 0
729.928, 825.293, 0, 729.928, 826.293, 0
729.616, 825.293, 0, 729.616, 826.293, 0
725.928, 825.293, 0, 725.928, 826.293, 0
725.616, 825.293, 0, 725.616, 826.293, 0
721.928, 825.293, 0, 721.928, 826.293, 0
721.616, 825.293, 0, 721.616, 826.293, 0
717.928, 825.293, 0, 717.928, 826.293, 0
717.616, 825.293, 0, 717.616, 826.293, 0
713.928, 825.293, 0, 713.928, 826.293, 0
713.616, 825.293, 0, 713.616, 826.293, 0
709.928, 825.293, 0, 709.928, 826.293, 0
709.616, 825.293, 0, 709.616, 826.293, 0
705.928, 825.293, 0, 705.928, 826.293, 0
705.616, 825.293, 0, 705.616, 826.293, 0
701.928, 825.293, 0, 701.928, 826.293, 0
701.616, 825.293, 0, 701.616, 826.293, 0
697.928, 825.293, 0, 697.928, 826.293, 0
697.616, 825.293, 0, 697.616, 826.293, 0
693.928, 825.293, 0, 693.928, 826.293, 0
693.616, 825.293, 0, 693.616, 826.293, 0
689.928, 825.293, 0, 689.928, 826.293, 0
689.616, 825.293, 0, 689.616, 826.293, 0
685.928, 825.293, 0, 685.928, 826.293, 0
685.616, 825.293, 0, 685.616, 826.293, 0
681.928, 825.293, 0, 681.928, 826.293, 0
681.616, 825.293, 0, 681.616, 826.293, 0
677.928, 825.293, 0, 677.928, 826.293, 0
677.616, 825.293, 0, 677.616, 826.293, 0
673.928, 825.293, 0, 673.928, 826.293, 0
673.616, 825.293, 0, 673.616, 826.293, 0
669.928, 825.293, 0, 669.928, 826.293, 0
669.616, 825.293, 0, 669.616, 826.293, 0
737.928, 826.481, 0, 737.928, 827.481, 0
737.616, 826.481, 0, 737.616, 827.481, 0
733.928, 826.481, 0, 733.928, 827.481, 0
733.616, 826.481, 0, 733.616, 827.481, 0
729.928, 826.481, 0, 729.928, 827.481, 0
729.616, 826.481, 0, 729.616, 827.481, 0
.
.
.
正如您所看到的,"Y"值正确地按升序排列,但"X"值是按降序排列的。 * 更新 ** 在评论区中提出了OrderBy比较器中典型的浮点数容差问题可能性。为了进行快速测试,我将.OrderBy子句更改为以下内容:
.OrderBy(o => Math.Min(Math.Round(o.StartPoint.Y, 3), Math.Round(o.EndPoint.Y, 3)))
这很丑陋,但它解决了排序问题。显然,没有一个"Y"值被视为相等。现在,我强制将它们四舍五入到3位小数,值确实匹配,然后执行ThenBy子句以按"X"值进行排序。
现在,有什么更好的方法来强制匹配吗?编写自己的比较器?
Line
类中使用decimal
类型来代替当前使用的类型作为X
和Y
的数据类型? - King King