c# - 将 List 复制到其他但将函数应用于 LINQ 中的属性

Question

我有一个类:

public class IdXYZ
    {
        int id;
        double x;
        double y;
        double z;
        public int ID
        {
            get { return id; }
            set { id = value; }
        }
        public double X
        {
            get { return x; }
            set { x = value; }
        }

        public double Y
        {
            get { return y; }
            set { y = value; }
        }
        public double Z
        {
            get { return z; }
            set { z = value; }
        }
        public IdXYZ(int argid, double argx, double argy, double argz)
        {
            id = argid;
            x = argx;
            y = argy;
            z = argz;
        }
        public IdXYZ(double argx, double argy, double argz)
        {
            x = argx;
            y = argy;
            z = argz;
        }
    }

假设我已经填写了一个列表:

List<IdXYZ> Points = new List<IdXYZ>();
Points.Add(new IdXYZ(520, 150, 520 ));
Points.Add(new IdXYZ(567, 120, 522 ));
Points.Add(new IdXYZ(614, 520, 541 ));
Points.Add(new IdXYZ(661, 520, 540 ));
Points.Add(new IdXYZ(520, 110, 544 ));
Points.Add(new IdXYZ(543, 110, 545 ));
Points.Add(new IdXYZ(567, 610, 549 ));
Points.Add(new IdXYZ(614, 610, 510 ));
Points.Add(new IdXYZ(661, 160, 820 ));
Points.Add(new IdXYZ(520, 166, 530 ));
Points.Add(new IdXYZ(543, 166, 330 ));
Points.Add(new IdXYZ(567, 660, 520 ));
Points.Add(new IdXYZ(614, 660, 520 ));
Points.Add(new IdXYZ(661, 660, 620 ));

如何将该列表复制到其他但应用以下条件

if (item.Z % 2 == 0 || item.Z % 100 == 0) 
  item.Z = item.Z - 505;
else
  item.Z = item.Z - 405;

我在做

var PointsB = (from item in Points select item.Z % 2 == 0 || item.Z % 100 == 0 ? item.Z - 505 : item.Z - 405);

但这只会得到 Z 的可枚举

如何使用上述条件获取带 Z 的新列表？

Answer 1

你需要做这样的事情:

var newList =
    Points
        .Select(item =>
        {
            if (item.Z % 2 == 0 || item.Z % 100 == 0)
                item.Z = item.Z - 505;
            else
                item.Z = item.Z - 405;
            return item;
        })
        .ToList();