public class Singleton {\n private static Singleton _instance;\n private Singleton() { } \/\/ private constructor to prevent external instantiation\n\n public static Singleton Instance {\n get {\n if (_instance == null)\n _instance = new Singleton();\n return _instance;\n }\n }\n\n public void DoSomething() {\n Console.WriteLine("Doing something...");\n }\n}\n<\/code><\/pre><\/div>\n\n\n\n<\/pre>\n\n\n\n
\n- \u30dd\u30a4\u30f3\u30c8<\/strong>\n
\n- \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092
private<\/code>\u306b\u3059\u308b \u2192 \u5916\u304b\u3089new<\/code>\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002<\/li>\n\n\n\nstatic<\/code>\u306a\u30d7\u30ed\u30d1\u30c6\u30a3Instance<\/code>\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3059\u3002<\/li>\n\n\n\n- \u521d\u56de\u30a2\u30af\u30bb\u30b9\u6642\u306b\u3060\u3051\u751f\u6210\u3057\u30012\u56de\u76ee\u4ee5\u964d\u306f\u540c\u3058\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u3002<\/li>\n\n\n\n
- \u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306f\u30ed\u30c3\u30af\u3084
System.Lazy<T><\/code>\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u3042\u308a\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\nFactory Method\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n\/\/ Product interface and its implementations\npublic interface IProduct { void Execute(); }\npublic class ConcreteProduct1 : IProduct {\n public void Execute() => Console.WriteLine("Execute Product1");\n}\npublic class ConcreteProduct2 : IProduct {\n public void Execute() => Console.WriteLine("Execute Product2");\n}\n\n\/\/ Creator abstract class\npublic abstract class Creator {\n public abstract IProduct FactoryMethod(); \/\/ Factory Method\n\n public void SomeOperation() {\n IProduct product = FactoryMethod();\n product.Execute();\n }\n}\n\npublic class CreatorA : Creator {\n public override IProduct FactoryMethod() {\n return new ConcreteProduct1();\n }\n}\n\npublic class CreatorB : Creator {\n public override IProduct FactoryMethod() {\n return new ConcreteProduct2();\n }\n}<\/code><\/pre><\/div>\n\n\n\n\u4f7f\u3044\u65b9<\/pre>\n\n\n\nCreator creator = new CreatorA(); \ncreator.SomeOperation(); \/\/ \u2192 "Execute Product1" \u3068\u8868\u793a \ncreator = new CreatorB();\ncreator.SomeOperation(); \/\/ \u2192 "Execute Product2" \u3068\u8868\u793a<\/code><\/pre><\/div>\n\n\n\n\n- \u30dd\u30a4\u30f3\u30c8<\/strong>\n
\nCreator<\/code>\u3068\u3044\u3046\u62bd\u8c61\u30af\u30e9\u30b9\u306b\u300c\u5de5\u5834\u30e1\u30bd\u30c3\u30c9\u300d\u3092\u5b9a\u7fa9\u3002<\/li>\n\n\n\nConcreteProduct1<\/code>\u3084ConcreteProduct2<\/code>\u306e\u3069\u3061\u3089\u3092\u4f5c\u308b\u304b\u306f\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u304a\u307e\u304b\u305b\u3002<\/li>\n\n\n\n- \u4f5c\u308a\u305f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7a2e\u985e\u3092\u5f8c\u304b\u3089\u7c21\u5358\u306b\u5909\u66f4\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
Abstract Factory\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<\/pre>\n\n\n\n\/\/ \u62bd\u8c61\u30d5\u30a1\u30af\u30c8\u30ea\npublic interface IUIFactory {\n IButton CreateButton();\n ITextBox CreateTextBox();\n}\n\n\/\/ \u5177\u4f53\u30d5\u30a1\u30af\u30c8\u30ea1\npublic class WindowsUIFactory : IUIFactory {\n public IButton CreateButton() => new WindowsButton();\n public ITextBox CreateTextBox() => new WindowsTextBox();\n}\n\n\/\/ \u5177\u4f53\u30d5\u30a1\u30af\u30c8\u30ea2\npublic class MacUIFactory : IUIFactory {\n public IButton CreateButton() => new MacButton();\n public ITextBox CreateTextBox() => new MacTextBox();\n}<\/code><\/pre><\/div>\n\n\n\n\n- \u30dd\u30a4\u30f3\u30c8<\/strong>\n
\nWindowsUIFactory<\/code>\u3067\u4f5c\u308b\u3068Windows\u98a8\u306e\u30dc\u30bf\u30f3\u3084\u30c6\u30ad\u30b9\u30c8\u30dc\u30c3\u30af\u30b9\u304c\u63c3\u3046\u3002<\/li>\n\n\n\nMacUIFactory<\/code>\u3067\u4f5c\u308b\u3068Mac\u98a8\u306b\u63c3\u3046\u3002<\/li>\n\n\n\n- \u3053\u3046\u3044\u3046UI\u90e8\u54c1\u306f\u300c\u30bb\u30c3\u30c8\u300d\u3067\u63c3\u3048\u305f\u3044\u306e\u3067\u3001Abstract Factory\u30d1\u30bf\u30fc\u30f3\u304c\u3074\u3063\u305f\u308a\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
Builder\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\npublic class Character {\n public string Hair { get; set; }\n public string Eyes { get; set; }\n public string Outfit { get; set; }\n public override string ToString() => $"Hair:{Hair}, Eyes:{Eyes}, Outfit:{Outfit}";\n}\n\n\/\/ Builder interface\npublic interface ICharacterBuilder {\n ICharacterBuilder SetHair(string style);\n ICharacterBuilder SetEyes(string type);\n ICharacterBuilder SetOutfit(string outfit);\n Character Build();\n}\n\npublic class CharacterBuilder : ICharacterBuilder {\n private Character _char = new Character();\n\n public ICharacterBuilder SetHair(string style) {\n _char.Hair = style;\n return this; \/\/ \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u304d\u308b\n }\n\n public ICharacterBuilder SetEyes(string type) {\n _char.Eyes = type;\n return this;\n }\n\n public ICharacterBuilder SetOutfit(string outfit) {\n _char.Outfit = outfit;\n return this;\n }\n\n public Character Build() {\n return _char;\n }\n}<\/code><\/pre><\/div>\n\n\n\n\n- \u4f7f\u3044\u65b9<\/strong><\/li>\n<\/ul>\n\n\n\n
var builder = new CharacterBuilder(); \nCharacter myAvatar = builder .SetHair("Long") .SetEyes("Blue") .SetOutfit("Warrior") .Build(); \nConsole.WriteLine(myAvatar.ToString()); \/\/ \u2192 "Hair:Long, Eyes:Blue, Outfit:Warrior"<\/code><\/pre><\/div>\n\n\n\n