顯示具有 SOLID 標籤的文章。 顯示所有文章
顯示具有 SOLID 標籤的文章。 顯示所有文章

2018年9月29日 星期六

『SOLID 重構挑戰練習』4. 使用 策略 設計模式 來重構程式碼


『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();
}
}
}