Question

假设我们有一个List<Point> Points如下所示，如何才能获得在列表中只重复一次的Point个对象：P（30,10）和P（30,0）< / p>

var Points = new List<Point>
{
    new Point { X = 0, Y = 0 },
    new Point { X = 10, Y = 20 },
    new Point { X = 30, Y = 10 },
    new Point { X = 30, Y = 0 },
    new Point { X = 0, Y = 0 },
    new Point { X = 10, Y = 20 }
};

public class Point
{
    public double X;
    public double Y;
};

Answer 1

var query = Points
    .GroupBy(p => new { p.X, p.Y }) // Group points based on (X,Y).
    .Where(g => g.Count() == 1)     // Take groups with exactly one point.
    .Select(g => g.Single());       // Select the point in each group.

如何使用LINQ查找列表中仅重复一次的项目

1 个答案: