Question

我有以下数据，我希望根据角度的方向填充collection。我希望集合具有数量的总和值。我应该使用哪个系列？

double angle = 20;
double quantity = 200;

double angle = 20;
double quantity = 250;

double angle = 30;
double quantity = 300;

double angle = 40;
double quantity = 400;

到目前为止，我已尝试使用枚举创建dictionary，如下所示。我相信这是一个好主意。有没有更好的方式

public enum Direction
{
    NorthToNortheast,
    NortheastToEast,
    EastToSoutheast,
    SoutheastToSouth,
    SouthToSouthwest,
    SouthwestToWest,
    WestToNorthwest,
    NorthwestToNorth
}

在我班上

Dictionary<Direction, double> elements = new Dictionary<Direction, double>();

然后对于每个值我填充字典

if (angle >= 0 && angle < 45)
    elements[Direction.NorthToNortheast] += quantity;
else if (angle >= 45 && angle < 90)
    elements[Direction.NortheastToEast] += quantity;

Answer 1

您可以将每个枚举值用作收集器类中的Property：

//The class is describing your items
class Item
    {
        public double Angle;
        public double Quantity;

        public Item(double angle, double quantity)
        {
            Angle = angle;
            Quantity = quantity;
        }       
    }

//Collector class
class Element
{
    public Element()
    {
        NorthToNortheast.Quantity = 200;
        NorthToNortheast.Angle = 250;

        NortheastToEast.Quantity = 30;
        NortheastToEast.Angle = 300;
    }
    public Item NorthToNortheast { set; get; }
    public Item NortheastToEast { set; get; }
}

Answer 2

您可以通过将方向和角度保持在列表中来简化方向查找，例如：

static readonly IReadOnlyList<CardinalDirection> _directionsByAngle = InitDirections();

// map each starting angle to a direction,
// sorted descending (largest angle first)
static IReadOnlyList<CardinalDirection> InitDirections()
{
    return new List<CardinalDirection>
    {
        new CardinalDirection (0, Direction.NorthToNortheast),
        new CardinalDirection (45, Direction.NortheastToEast),
        ...
    }
    .OrderByDescending(d => d.StartAngle)
    .ToList();
}

// find the first (largest) d.StartAngle such that angle >= d.StartAngle
static CardinalDirection GetDirectionForAngle(double angle)
{
    return _directionsByAngle
        .Where(d => angle >= d.StartAngle)
        .FirstOrDefault();
}

根据您想要对值执行的操作，将字符串保存在字典中就像您现在使用的那样可以正常工作。通过上面的剪辑，您将拥有：

var direction = GetDirectionForAngle(angle % 360);
elements[direction.Direction] += quantity;

哪个集合用于固定值列表

2 个答案: