『SOLID 重構挑戰練習』4. 使用 策略 設計模式 來重構程式碼

using System;
	using System.Collections.Generic;
	using System.Drawing;
	using System.Linq;
	namespace RefactorSwitchStrategy
	{
	public class StringToColor
	{
	public Color Transfer(string name)
	{
	Color transferResult;
	switch (name.ToLower())
	{
	case "red":
	transferResult = Color.FromArgb(0xFF, 0xFF, 0x00, 0x00);
	break;
	case "green":
	transferResult = Color.FromArgb(0xFF, 0x80, 0x80, 0x80);
	break;
	case "blue":
	transferResult = Color.FromArgb(0xFF, 0x00, 0x00, 0xFF);
	break;
	default:
	throw new ArgumentException("不正確的顏色名稱");
	}
	return transferResult;
	}
	}
	namespace RefactorSwitchStrategy.Refactoring
	{
	#region 將不同顏色名稱轉換成為顏色物件的過程，設計成為不同的類別
	public interface IColorTranserService
	{
	Color Transfer(string name);
	}
	public class ColorTransferServce : IColorTranserService
	{
	List<ColorTransfer> _colorMaps;
	public ColorTransferServce()
	{
	_colorMaps = new List<ColorTransfer>()
	{
	{new TransferToRed() },
	{new TransferToGreen() },
	{new TransferToBlue() },
	};
	}
	public Color Transfer(string name)
	{
	return _colorMaps.FirstOrDefault(x => x.ColorName == name).Transfer();
	}
	}
	public abstract class ColorTransfer
	{
	public abstract Color Transfer();
	public abstract string ColorName { get; }
	}
	public class TransferToRed : ColorTransfer
	{
	public override string ColorName => "Red";
	public override Color Transfer()
	{
	return Color.FromArgb(0xFF, 0xFF, 0x00, 0x00);
	}
	}
	public class TransferToGreen : ColorTransfer
	{
	public override string ColorName => "Green";
	public override Color Transfer()
	{
	return Color.FromArgb(0xFF, 0x80, 0x80, 0x80);
	}
	}
	public class TransferToBlue : ColorTransfer
	{
	public override string ColorName => "Blue";
	public override Color Transfer()
	{
	return Color.FromArgb(0xFF, 0x00, 0x00, 0xFF);
	}
	}
	public class StringToColor
	{
	IColorTranserService _colorTranserService;
	Dictionary<string, Color> ColorMaps;
	public StringToColor(IColorTranserService colorTranserService)
	{
	_colorTranserService = colorTranserService;
	}
	public StringToColor() : this(new ColorTransferServce())
	{
	}
	public Color Transfer(string name)
	{
	return _colorTranserService.Transfer(name);
	}
	}
	#endregion
	}
	class Program
	{
	static void Main(string[] args)
	{
	string MyColorName = "Blue";
	Console.WriteLine("使用 Swith 來設計方法");
	StringToColor foo = new StringToColor();
	Color fooColor = foo.Transfer(MyColorName);
	Console.WriteLine($"{MyColorName} = A:{fooColor.A} R:{fooColor.R} G:{fooColor.G} B:{fooColor.B}");
	Console.WriteLine("Press any key for continuing...");
	Console.ReadKey();
	Console.WriteLine("使用 使用策略設計模式與簡易相依注入 來重構方法，進行 Swith 需求設計");
	RefactorSwitchStrategy.Refactoring.StringToColor fooRefactoring = new RefactorSwitchStrategy.Refactoring.StringToColor();
	Color fooRefactoringColor = fooRefactoring.Transfer(MyColorName);
	Console.WriteLine($"{MyColorName} = A:{fooRefactoringColor.A} R:{fooRefactoringColor.R} G:{fooRefactoringColor.G} B:{fooRefactoringColor.B}");
	Console.WriteLine("Press any key for continuing...");
	Console.ReadKey();
	}
	}
	}