[英]How can I use Function as value in dictionary? (C#)
我想創建一個字典並以特定的方式填充它。
public struct Position
{
public int X { get; set; }
public int Y { get; set; }
public char Orientation { get; set; }
}
public Dictionary<Position, Position> ChangePosition;
方向可以是'N','S','E','W'表示北,南,......
當第一個鍵是X,Y,'N' --->值應為X,Y + 1,'N'
因此,字典可以基於當前位置和移動方向來預測項目的下一個位置。
我怎么能填這個字典? 或者還有其他更好的方法來實現它嗎?
任何幫助,將不勝感激。
更新
我找到了這個解決方案,但是我猜想像Action<>
可能會讓它變得更好:
ChangePosition= new Dictionary<char, Func<Position, Position>>
{
{'N', pos => new Position {X = pos.X, Y = pos.Y + 1, Orientation = pos.Orientation}},
{'E', pos => new Position {X = pos.X+1, Y = pos.Y , Orientation = pos.Orientation}},
{'W', pos => new Position {X = pos.X-1, Y = pos.Y, Orientation = pos.Orientation}},
{'S', pos => new Position {X = pos.X, Y = pos.Y - 1, Orientation = pos.Orientation}},
};
我強烈建議將Position定位為對象和指南針方向字符('N','E','W','S')枚舉。 生成的界面更清晰,更直觀。
using System;
using System.Collections.Generic;
namespace DictionaryOfFunctions_StackOverflow
{
class Program
{
static void Main(string[] args)
{
Position start = new Position()
{
X = 0,
Y = 0,
Orientation = CompassDirection.North
};
start.Move(CompassDirection.North, 5);
start.Print(); // X: 0 Y: 5 Orientation: North
start.Move(CompassDirection.SouthWest, 5);
start.Print(); // X: -5 Y: 0 Orientation: SouthWest
start.Move(CompassDirection.East);
start.Print(); // X: -5 Y: 0 Orientation: East
start.Move(dX: 5, dY: 1, newDirection: CompassDirection.West);
start.Print(); // X: 0 Y: 1 Orientation: West
start.Move(dY: -1, newDirection: CompassDirection.North);
start.Print(); // X: 0 Y: 0 Orientation: North
Console.ReadKey();
}
}
public enum CompassDirection
{
NorthWest,
North,
NorthEast,
East,
SouthEast,
South,
SouthWest,
West
}
public class Position
{
public CompassDirection Orientation { get; set; }
public int X { get; set; }
public int Y { get; set; }
public void Move(int dX = 0, int dY = 0, CompassDirection? newDirection = null)
{
X += dX;
Y += dY;
Orientation = newDirection.HasValue ? newDirection.Value : Orientation;
}
public void Move(CompassDirection newDirection, int distance = 0)
{
var movement = new Dictionary<CompassDirection, Action>
{
{CompassDirection.NorthWest, () => Move(dY: 1, dX: -1)},
{CompassDirection.North, () => Move(dY: 1)},
{CompassDirection.NorthEast, () => Move(dY: 1, dX: 1)},
{CompassDirection.East, () => Move(dX: 1)},
{CompassDirection.SouthEast, () => Move(dY: -1, dX: 1)},
{CompassDirection.South, () => Move(dY: -1)},
{CompassDirection.SouthWest, () => Move(dY: -1, dX: -1)},
{CompassDirection.West, () => Move(dX: -1)}
};
Orientation = newDirection;
for (int i=0; i< distance; i++)
{
Action changePosition = movement[Orientation];
changePosition();
}
}
}
public static class ExtensionMethods
{
public static void Print(this Position pos)
{
string display = $"X: {pos.X} Y: {pos.Y} Orientation: {pos.Orientation}";
Console.WriteLine(display);
}
}
}
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