├── .gitignore ├── AbstractFactoryPattern ├── AbstractFactoryPattern.csproj └── Program.cs ├── AdapterPattern ├── AdapterPattern.csproj └── Program.cs ├── BridgePattern ├── BridgePattern.csproj └── Program.cs ├── BuilderPattern ├── BuilderPattern.csproj └── Program.cs ├── ChainOfResponsibilityPattern ├── ChainOfResponsibilityPattern.csproj └── Program.cs ├── CommandPattern ├── CommandPattern.csproj └── Program.cs ├── CompositePattern ├── CompositePattern.csproj └── Program.cs ├── DecoratorPattern ├── DecoratorPattern.csproj └── Program.cs ├── DesignPatterns.sln ├── FacadePattern ├── FacadePattern.csproj └── Program.cs ├── FactoryMethodPattern ├── FactoryMethodPattern.csproj └── Program.cs ├── FactoryPattern ├── FactoryPattern.csproj └── Program.cs ├── FlyweightPattern ├── FlyweightPattern.csproj └── Program.cs ├── IteratorPattern ├── IteratorPattern.csproj └── Program.cs ├── LICENSE ├── MediatorPattern ├── MediatorPattern.csproj └── Program.cs ├── Memento ├── MementoPattern.csproj └── Program.cs ├── ObserverPattern ├── ObserverPattern.csproj └── Program.cs ├── PrototypePattern ├── Program.cs └── PrototypePattern.csproj ├── ProxyPattern ├── Program.cs └── ProxyPattern.csproj ├── README.md ├── SingletonPattern ├── Program.cs └── SingletonPattern.csproj ├── StatePattern ├── Program.cs └── StatePattern.csproj ├── StrategyPattern ├── Program.cs └── StrategyPattern.csproj ├── TemplateMethodPattern ├── Program.cs └── TemplateMethodPattern.csproj └── VisitorPattern ├── Program.cs └── VisitorPattern.csproj /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.suo 8 | *.user 9 | *.userosscache 10 | *.sln.docstates 11 | 12 | # User-specific files (MonoDevelop/Xamarin Studio) 13 | *.userprefs 14 | 15 | # Build results 16 | [Dd]ebug/ 17 | [Dd]ebugPublic/ 18 | [Rr]elease/ 19 | [Rr]eleases/ 20 | x64/ 21 | x86/ 22 | bld/ 23 | [Bb]in/ 24 | [Oo]bj/ 25 | [Ll]og/ 26 | 27 | # Visual Studio 2015 cache/options directory 28 | .vs/ 29 | # Uncomment if you have tasks that create the project's static files in wwwroot 30 | #wwwroot/ 31 | 32 | # MSTest test Results 33 | [Tt]est[Rr]esult*/ 34 | [Bb]uild[Ll]og.* 35 | 36 | # NUNIT 37 | *.VisualState.xml 38 | TestResult.xml 39 | 40 | # Build Results of an ATL Project 41 | [Dd]ebugPS/ 42 | [Rr]eleasePS/ 43 | dlldata.c 44 | 45 | # .NET Core 46 | project.lock.json 47 | project.fragment.lock.json 48 | artifacts/ 49 | **/Properties/launchSettings.json 50 | 51 | *_i.c 52 | *_p.c 53 | *_i.h 54 | *.ilk 55 | *.meta 56 | *.obj 57 | *.pch 58 | *.pdb 59 | *.pgc 60 | *.pgd 61 | *.rsp 62 | *.sbr 63 | *.tlb 64 | *.tli 65 | *.tlh 66 | *.tmp 67 | *.tmp_proj 68 | *.log 69 | *.vspscc 70 | *.vssscc 71 | .builds 72 | *.pidb 73 | *.svclog 74 | *.scc 75 | 76 | # Chutzpah Test files 77 | _Chutzpah* 78 | 79 | # Visual C++ cache files 80 | ipch/ 81 | *.aps 82 | *.ncb 83 | *.opendb 84 | *.opensdf 85 | *.sdf 86 | *.cachefile 87 | *.VC.db 88 | *.VC.VC.opendb 89 | 90 | # Visual Studio profiler 91 | *.psess 92 | *.vsp 93 | *.vspx 94 | *.sap 95 | 96 | # TFS 2012 Local Workspace 97 | $tf/ 98 | 99 | # Guidance Automation Toolkit 100 | *.gpState 101 | 102 | # ReSharper is a .NET coding add-in 103 | _ReSharper*/ 104 | *.[Rr]e[Ss]harper 105 | *.DotSettings.user 106 | 107 | # JustCode is a .NET coding add-in 108 | .JustCode 109 | 110 | # TeamCity is a build add-in 111 | _TeamCity* 112 | 113 | # DotCover is a Code Coverage Tool 114 | *.dotCover 115 | 116 | # Visual Studio code coverage results 117 | *.coverage 118 | *.coveragexml 119 | 120 | # NCrunch 121 | _NCrunch_* 122 | .*crunch*.local.xml 123 | nCrunchTemp_* 124 | 125 | # MightyMoose 126 | *.mm.* 127 | AutoTest.Net/ 128 | 129 | # Web workbench (sass) 130 | .sass-cache/ 131 | 132 | # Installshield output folder 133 | [Ee]xpress/ 134 | 135 | # DocProject is a documentation generator add-in 136 | DocProject/buildhelp/ 137 | DocProject/Help/*.HxT 138 | DocProject/Help/*.HxC 139 | DocProject/Help/*.hhc 140 | DocProject/Help/*.hhk 141 | DocProject/Help/*.hhp 142 | DocProject/Help/Html2 143 | DocProject/Help/html 144 | 145 | # Click-Once directory 146 | publish/ 147 | 148 | # Publish Web Output 149 | *.[Pp]ublish.xml 150 | *.azurePubxml 151 | # TODO: Comment the next line if you want to checkin your web deploy settings 152 | # but database connection strings (with potential passwords) will be unencrypted 153 | *.pubxml 154 | *.publishproj 155 | 156 | # Microsoft Azure Web App publish settings. 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Backup files are not needed, 213 | # because we have git ;-) 214 | _UpgradeReport_Files/ 215 | Backup*/ 216 | UpgradeLog*.XML 217 | UpgradeLog*.htm 218 | 219 | # SQL Server files 220 | *.mdf 221 | *.ldf 222 | *.ndf 223 | 224 | # Business Intelligence projects 225 | *.rdl.data 226 | *.bim.layout 227 | *.bim_*.settings 228 | 229 | # Microsoft Fakes 230 | FakesAssemblies/ 231 | 232 | # GhostDoc plugin setting file 233 | *.GhostDoc.xml 234 | 235 | # Node.js Tools for Visual Studio 236 | .ntvs_analysis.dat 237 | node_modules/ 238 | 239 | # Typescript v1 declaration files 240 | typings/ 241 | 242 | # Visual Studio 6 build log 243 | *.plg 244 | 245 | # Visual Studio 6 workspace options file 246 | *.opt 247 | 248 | # Visual Studio 6 auto-generated workspace file (contains which files were open etc.) 249 | *.vbw 250 | 251 | # Visual Studio LightSwitch build output 252 | **/*.HTMLClient/GeneratedArtifacts 253 | **/*.DesktopClient/GeneratedArtifacts 254 | **/*.DesktopClient/ModelManifest.xml 255 | **/*.Server/GeneratedArtifacts 256 | **/*.Server/ModelManifest.xml 257 | _Pvt_Extensions 258 | 259 | # Paket dependency manager 260 | .paket/paket.exe 261 | paket-files/ 262 | 263 | # FAKE - F# Make 264 | .fake/ 265 | 266 | # JetBrains Rider 267 | .idea/ 268 | *.sln.iml 269 | 270 | # CodeRush 271 | .cr/ 272 | 273 | # Python Tools for Visual Studio (PTVS) 274 | __pycache__/ 275 | *.pyc 276 | 277 | # Cake - Uncomment if you are using it 278 | # tools/** 279 | # !tools/packages.config 280 | 281 | # Telerik's JustMock configuration file 282 | *.jmconfig 283 | 284 | # BizTalk build output 285 | *.btp.cs 286 | *.btm.cs 287 | *.odx.cs 288 | *.xsd.cs 289 | -------------------------------------------------------------------------------- /AbstractFactoryPattern/AbstractFactoryPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /AbstractFactoryPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace AbstractFactoryPattern 4 | { 5 | interface IDoor 6 | { 7 | 8 | void GetDescription(); 9 | 10 | } 11 | class WoodenDoor : IDoor 12 | { 13 | public void GetDescription() 14 | { 15 | Console.WriteLine("I am a wooden door"); 16 | } 17 | } 18 | 19 | class IronDoor : IDoor 20 | { 21 | public void GetDescription() 22 | { 23 | Console.WriteLine("I am a iron door"); 24 | } 25 | } 26 | 27 | interface IDoorFittingExpert 28 | { 29 | void GetDescription(); 30 | } 31 | 32 | class Welder : IDoorFittingExpert 33 | { 34 | public void GetDescription() 35 | { 36 | Console.WriteLine("I can only fit iron doors"); 37 | } 38 | } 39 | 40 | class Carpenter : IDoorFittingExpert 41 | { 42 | public void GetDescription() 43 | { 44 | Console.WriteLine("I can only fit wooden doors"); 45 | } 46 | } 47 | 48 | interface IDoorFactory 49 | { 50 | IDoor MakeDoor(); 51 | IDoorFittingExpert MakeFittingExpert(); 52 | } 53 | 54 | // Wooden factory to return carpenter and wooden door 55 | class WoodenDoorFactory : IDoorFactory 56 | { 57 | public IDoor MakeDoor() 58 | { 59 | return new WoodenDoor(); 60 | } 61 | // Iron door factory to get iron door and the relevant fitting expert 62 | public IDoorFittingExpert MakeFittingExpert() 63 | { 64 | return new Carpenter(); 65 | } 66 | } 67 | 68 | class IronDoorFactory : IDoorFactory 69 | { 70 | public IDoor MakeDoor() 71 | { 72 | return new IronDoor(); 73 | } 74 | 75 | public IDoorFittingExpert MakeFittingExpert() 76 | { 77 | return new Welder(); 78 | } 79 | } 80 | 81 | 82 | class Program 83 | { 84 | static void Main(string[] args) 85 | { 86 | var woodenDoorFactory = new WoodenDoorFactory(); 87 | var woodenDoor = woodenDoorFactory.MakeDoor(); 88 | var woodenDoorFittingExpert = woodenDoorFactory.MakeFittingExpert(); 89 | 90 | woodenDoor.GetDescription(); //Output : I am a wooden door 91 | woodenDoorFittingExpert.GetDescription();//Output : I can only fit woooden doors 92 | 93 | var ironDoorFactory = new IronDoorFactory(); 94 | var ironDoor = ironDoorFactory.MakeDoor(); 95 | var ironDoorFittingExpert = ironDoorFactory.MakeFittingExpert(); 96 | 97 | ironDoor.GetDescription();//Output : I am a iron door 98 | ironDoorFittingExpert.GetDescription();//Output : I can only fit iron doors 99 | 100 | Console.ReadLine(); 101 | } 102 | } 103 | } 104 | -------------------------------------------------------------------------------- /AdapterPattern/AdapterPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /AdapterPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace AdapterPattern 4 | { 5 | interface ILion 6 | { 7 | void Roar(); 8 | } 9 | 10 | class AfricanLion : ILion 11 | { 12 | public void Roar() 13 | { 14 | 15 | } 16 | } 17 | 18 | class AsiaLion : ILion 19 | { 20 | public void Roar() 21 | { 22 | 23 | } 24 | } 25 | 26 | // This needs to be added to the game 27 | class WildDog 28 | { 29 | public void bark() 30 | { 31 | } 32 | } 33 | 34 | // Adapter around wild dog to make it compatible with our game 35 | class WildDogAdapter : ILion 36 | { 37 | private WildDog mDog; 38 | public WildDogAdapter(WildDog dog) 39 | { 40 | this.mDog = dog; 41 | } 42 | public void Roar() 43 | { 44 | mDog.bark(); 45 | } 46 | } 47 | 48 | class Hunter 49 | { 50 | public void Hunt(ILion lion) 51 | { 52 | 53 | } 54 | } 55 | 56 | class Program 57 | { 58 | static void Main(string[] args) 59 | { 60 | var wildDog = new WildDog(); 61 | var wildDogAdapter = new WildDogAdapter(wildDog); 62 | 63 | var hunter = new Hunter(); 64 | hunter.Hunt(wildDogAdapter); 65 | 66 | Console.ReadLine(); 67 | } 68 | } 69 | } 70 | -------------------------------------------------------------------------------- /BridgePattern/BridgePattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /BridgePattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace BridgePattern 4 | { 5 | class Program 6 | { 7 | interface IWebPage 8 | { 9 | string GetContent(); 10 | } 11 | 12 | class About : IWebPage 13 | { 14 | protected ITheme theme; 15 | 16 | public About(ITheme theme) 17 | { 18 | this.theme = theme; 19 | } 20 | 21 | public string GetContent() 22 | { 23 | return String.Format("About page in {0}", theme.GetColor()); 24 | } 25 | } 26 | 27 | class Careers : IWebPage 28 | { 29 | protected ITheme theme; 30 | 31 | public Careers(ITheme theme) 32 | { 33 | this.theme = theme; 34 | } 35 | 36 | public string GetContent() 37 | { 38 | return String.Format("Careers page in {0}", theme.GetColor()); 39 | } 40 | } 41 | 42 | interface ITheme 43 | { 44 | string GetColor(); 45 | } 46 | 47 | class DarkTheme : ITheme 48 | { 49 | public string GetColor() 50 | { 51 | return "Dark Black"; 52 | } 53 | } 54 | 55 | class LightTheme : ITheme 56 | { 57 | public string GetColor() 58 | { 59 | return "Off White"; 60 | } 61 | } 62 | 63 | class AquaTheme : ITheme 64 | { 65 | public string GetColor() 66 | { 67 | return "Light blue"; 68 | } 69 | } 70 | static void Main(string[] args) 71 | { 72 | var darkTheme = new DarkTheme(); 73 | 74 | var about = new About(darkTheme); 75 | var careers = new Careers(darkTheme); 76 | 77 | Console.WriteLine(about.GetContent()); 78 | Console.WriteLine(careers.GetContent()); 79 | Console.ReadLine(); 80 | } 81 | } 82 | } 83 | -------------------------------------------------------------------------------- /BuilderPattern/BuilderPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /BuilderPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Text; 3 | 4 | namespace BuilderPattern 5 | { 6 | class Program 7 | { 8 | class Burger 9 | { 10 | private int mSize; 11 | private bool mCheese; 12 | private bool mPepperoni; 13 | private bool mLettuce; 14 | private bool mTomato; 15 | 16 | public Burger(BurgerBuilder builder) 17 | { 18 | this.mSize = builder.Size; 19 | this.mCheese = builder.Cheese; 20 | this.mPepperoni = builder.Pepperoni; 21 | this.mLettuce = builder.Lettuce; 22 | this.mTomato = builder.Tomato; 23 | } 24 | 25 | public string GetDescription() 26 | { 27 | var sb = new StringBuilder(); 28 | sb.Append(String.Format("This is {0} inch Burger. ", this.mSize)); 29 | return sb.ToString(); 30 | } 31 | } 32 | 33 | class BurgerBuilder { 34 | public int Size; 35 | public bool Cheese; 36 | public bool Pepperoni; 37 | public bool Lettuce; 38 | public bool Tomato; 39 | 40 | public BurgerBuilder(int size) 41 | { 42 | this.Size = size; 43 | } 44 | 45 | public BurgerBuilder AddCheese() 46 | { 47 | this.Cheese = true; 48 | return this; 49 | } 50 | 51 | public BurgerBuilder AddPepperoni() 52 | { 53 | this.Pepperoni = true; 54 | return this; 55 | } 56 | 57 | public BurgerBuilder AddLettuce() 58 | { 59 | this.Lettuce = true; 60 | return this; 61 | } 62 | 63 | public BurgerBuilder AddTomato() 64 | { 65 | this.Tomato = true; 66 | return this; 67 | } 68 | 69 | public Burger Build() 70 | { 71 | return new Burger(this); 72 | } 73 | } 74 | 75 | static void Main(string[] args) 76 | { 77 | var burger = new BurgerBuilder(4).AddCheese() 78 | .AddPepperoni() 79 | .AddLettuce() 80 | .AddTomato() 81 | .Build(); 82 | Console.WriteLine(burger.GetDescription()); 83 | Console.ReadLine(); 84 | } 85 | } 86 | } 87 | -------------------------------------------------------------------------------- /ChainOfResponsibilityPattern/ChainOfResponsibilityPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /ChainOfResponsibilityPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace ChainOfResponsibilityPattern 4 | { 5 | abstract class Account 6 | { 7 | private Account mSuccessor; 8 | protected decimal mBalance; 9 | 10 | public void SetNext(Account account) 11 | { 12 | mSuccessor = account; 13 | } 14 | 15 | public void Pay(decimal amountTopay) 16 | { 17 | if (CanPay(amountTopay)) 18 | { 19 | Console.WriteLine("Paid {0:c} using {1}.", amountTopay, this.GetType().Name); 20 | } 21 | else if (this.mSuccessor != null) 22 | { 23 | Console.WriteLine("Cannot pay using {0}. Proceeding..", this.GetType().Name); 24 | mSuccessor.Pay(amountTopay); 25 | } 26 | else 27 | { 28 | throw new Exception("None of the accounts have enough balance"); 29 | } 30 | } 31 | private bool CanPay(decimal amount) 32 | { 33 | return mBalance >= amount ? true : false; 34 | } 35 | } 36 | 37 | class Bank : Account 38 | { 39 | public Bank(decimal balance) 40 | { 41 | this.mBalance = balance; 42 | } 43 | } 44 | 45 | class Paypal : Account 46 | { 47 | public Paypal(decimal balance) 48 | { 49 | this.mBalance = balance; 50 | } 51 | } 52 | 53 | class Bitcoin : Account 54 | { 55 | public Bitcoin(decimal balance) 56 | { 57 | this.mBalance = balance; 58 | } 59 | } 60 | class Program 61 | { 62 | static void Main(string[] args) 63 | { 64 | // Let's prepare a chain like below 65 | // $bank->$paypal->$bitcoin 66 | // 67 | // First priority bank 68 | // If bank can't pay then paypal 69 | // If paypal can't pay then bit coin 70 | var bank = new Bank(100); // Bank with balance 100 71 | var paypal = new Paypal(200); // Paypal with balance 200 72 | var bitcoin = new Bitcoin(300); // Bitcoin with balance 300 73 | 74 | bank.SetNext(paypal); 75 | paypal.SetNext(bitcoin); 76 | 77 | // Let's try to pay using the first priority i.e. bank 78 | bank.Pay(259); 79 | // Output will be 80 | // ============== 81 | // Cannot pay using bank. Proceeding .. 82 | // Cannot pay using paypal. Proceeding ..: 83 | // Paid 259 using Bitcoin! 84 | 85 | Console.ReadLine(); 86 | } 87 | } 88 | } 89 | -------------------------------------------------------------------------------- /CommandPattern/CommandPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /CommandPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace CommandPattern 4 | { 5 | class Program 6 | { 7 | // Receiver 8 | class Bulb 9 | { 10 | public void TurnOn() 11 | { 12 | Console.WriteLine("Bulb has been lit"); 13 | } 14 | 15 | public void TurnOff() 16 | { 17 | Console.WriteLine("Darkness!"); 18 | } 19 | } 20 | 21 | interface ICommand 22 | { 23 | void Execute(); 24 | void Undo(); 25 | void Redo(); 26 | } 27 | 28 | // Command 29 | class TurnOn : ICommand 30 | { 31 | private Bulb mBulb; 32 | 33 | public TurnOn(Bulb bulb) 34 | { 35 | mBulb = bulb ?? throw new ArgumentNullException("Bulb", "Bulb cannot be null"); 36 | } 37 | 38 | public void Execute() 39 | { 40 | mBulb.TurnOn(); 41 | } 42 | 43 | public void Undo() 44 | { 45 | mBulb.TurnOff(); 46 | } 47 | 48 | public void Redo() 49 | { 50 | Execute(); 51 | } 52 | } 53 | 54 | class TurnOff : ICommand 55 | { 56 | private Bulb mBulb; 57 | 58 | public TurnOff(Bulb bulb) 59 | { 60 | mBulb = bulb ?? throw new ArgumentNullException("Bulb", "Bulb cannot be null"); 61 | } 62 | 63 | public void Execute() 64 | { 65 | mBulb.TurnOff(); 66 | } 67 | 68 | public void Undo() 69 | { 70 | mBulb.TurnOn(); 71 | } 72 | 73 | public void Redo() 74 | { 75 | Execute(); 76 | } 77 | } 78 | 79 | // Invoker 80 | class RemoteControl 81 | { 82 | public void Submit(ICommand command) 83 | { 84 | command.Execute(); 85 | } 86 | } 87 | 88 | static void Main(string[] args) 89 | { 90 | var bulb = new Bulb(); 91 | 92 | var turnOn = new TurnOn(bulb); 93 | var turnOff = new TurnOff(bulb); 94 | 95 | var remote = new RemoteControl(); 96 | remote.Submit(turnOn); // Bulb has been lit! 97 | remote.Submit(turnOff); // Darkness! 98 | 99 | Console.ReadLine(); 100 | } 101 | } 102 | } 103 | -------------------------------------------------------------------------------- /CompositePattern/CompositePattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /CompositePattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | 4 | namespace CompositePattern 5 | { 6 | interface IEmployee 7 | { 8 | float GetSalary(); 9 | string GetRole(); 10 | string GetName(); 11 | } 12 | 13 | 14 | class Developer : IEmployee 15 | { 16 | private string mName; 17 | private float mSalary; 18 | 19 | public Developer(string name, float salary) 20 | { 21 | this.mName = name; 22 | this.mSalary = salary; 23 | } 24 | 25 | public float GetSalary() 26 | { 27 | return this.mSalary; 28 | } 29 | 30 | public string GetRole() 31 | { 32 | return "Developer"; 33 | } 34 | 35 | public string GetName() 36 | { 37 | return this.mName; 38 | } 39 | } 40 | 41 | class Designer : IEmployee 42 | { 43 | private string mName; 44 | private float mSalary; 45 | 46 | public Designer(string name, float salary) 47 | { 48 | this.mName = name; 49 | this.mSalary = salary; 50 | } 51 | 52 | public float GetSalary() 53 | { 54 | return this.mSalary; 55 | } 56 | 57 | public string GetRole() 58 | { 59 | return "Designer"; 60 | } 61 | 62 | public string GetName() 63 | { 64 | return this.mName; 65 | } 66 | } 67 | class Organization 68 | { 69 | protected List employees; 70 | 71 | public Organization() 72 | { 73 | employees = new List(); 74 | } 75 | 76 | public void AddEmployee(IEmployee employee) 77 | { 78 | employees.Add(employee); 79 | } 80 | 81 | public float GetNetSalaries() 82 | { 83 | float netSalary = 0; 84 | 85 | foreach (var e in employees) { 86 | netSalary += e.GetSalary(); 87 | } 88 | return netSalary; 89 | } 90 | } 91 | class Program 92 | { 93 | static void Main(string[] args) 94 | { 95 | var developer = new Developer("John", 5000); 96 | var designer = new Designer("Arya", 5000); 97 | 98 | var organization = new Organization(); 99 | organization.AddEmployee(developer); 100 | organization.AddEmployee(designer); 101 | Console.WriteLine("Net Salary of Emmployees in Organization is {0:c}", organization.GetNetSalaries()); 102 | Console.ReadLine(); 103 | } 104 | } 105 | } 106 | -------------------------------------------------------------------------------- /DecoratorPattern/DecoratorPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /DecoratorPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace DecoratorPattern 4 | { 5 | interface ICoffee 6 | { 7 | int GetCost(); 8 | string GetDescription(); 9 | } 10 | 11 | class SimpleCoffee : ICoffee 12 | { 13 | public int GetCost() 14 | { 15 | return 5; 16 | } 17 | 18 | public string GetDescription() 19 | { 20 | return "Simple Coffee"; 21 | } 22 | } 23 | 24 | class MilkCoffee : ICoffee 25 | { 26 | private readonly ICoffee mCoffee; 27 | 28 | public MilkCoffee(ICoffee coffee) 29 | { 30 | mCoffee = coffee ?? throw new ArgumentNullException("coffee", "coffee should not be null"); 31 | } 32 | public int GetCost() 33 | { 34 | return mCoffee.GetCost() + 1; 35 | } 36 | 37 | public string GetDescription() 38 | { 39 | return String.Concat(mCoffee.GetDescription(), ", milk"); 40 | } 41 | } 42 | 43 | class WhipCoffee : ICoffee 44 | { 45 | private readonly ICoffee mCoffee; 46 | 47 | public WhipCoffee(ICoffee coffee) 48 | { 49 | mCoffee = coffee ?? throw new ArgumentNullException("coffee", "coffee should not be null"); 50 | } 51 | public int GetCost() 52 | { 53 | return mCoffee.GetCost() + 1; 54 | } 55 | 56 | public string GetDescription() 57 | { 58 | return String.Concat(mCoffee.GetDescription(), ", whip"); 59 | } 60 | } 61 | 62 | class VanillaCoffee : ICoffee 63 | { 64 | private readonly ICoffee mCoffee; 65 | 66 | public VanillaCoffee(ICoffee coffee) 67 | { 68 | mCoffee = coffee ?? throw new ArgumentNullException("coffee", "coffee should not be null"); 69 | } 70 | public int GetCost() 71 | { 72 | return mCoffee.GetCost() + 1; 73 | } 74 | 75 | public string GetDescription() 76 | { 77 | return String.Concat(mCoffee.GetDescription(), ", vanilla"); 78 | } 79 | } 80 | class Program 81 | { 82 | static void Main(string[] args) 83 | { 84 | var myCoffee = new SimpleCoffee(); 85 | Console.WriteLine("{0:c}",myCoffee.GetCost()); // $ 5.00 86 | Console.WriteLine("{0}", myCoffee.GetDescription()); // Simple Coffee 87 | 88 | var milkCoffee = new MilkCoffee(myCoffee); 89 | Console.WriteLine("{0:c}", milkCoffee.GetCost()); // $ 6.00 90 | Console.WriteLine("{0}", milkCoffee.GetDescription()); // Simple Coffee, milk 91 | 92 | var whipCoffee = new WhipCoffee(milkCoffee); 93 | Console.WriteLine("{0:c}", whipCoffee.GetCost()); // $ 7.00 94 | Console.WriteLine("{0}", whipCoffee.GetDescription()); // Simple Coffee, milk, whip 95 | 96 | var vanillaCoffee = new VanillaCoffee(whipCoffee); 97 | Console.WriteLine("{0:c}", vanillaCoffee.GetCost()); // $ 8.00 98 | Console.WriteLine("{0}", vanillaCoffee.GetDescription()); // Simple Coffee, milk, whip 99 | Console.ReadLine(); 100 | } 101 | } 102 | } 103 | -------------------------------------------------------------------------------- /DesignPatterns.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.27004.2009 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FactoryPattern", "FactoryPattern\FactoryPattern.csproj", "{EC684E1B-EA3F-47FD-8F45-175C56667F13}" 7 | EndProject 8 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FactoryMethodPattern", "FactoryMethodPattern\FactoryMethodPattern.csproj", "{493DBC90-47D2-49F5-906D-14F3AFDDF9F8}" 9 | EndProject 10 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AbstractFactoryPattern", "AbstractFactoryPattern\AbstractFactoryPattern.csproj", "{081F04C5-CF9E-4997-B04E-5F9FDCCEE90D}" 11 | EndProject 12 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BuilderPattern", "BuilderPattern\BuilderPattern.csproj", "{A2804858-D1F9-4849-8C7E-1AB4DA7F979E}" 13 | EndProject 14 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SingletonPattern", "SingletonPattern\SingletonPattern.csproj", "{A61E958E-B6C9-413F-BACA-EA23D38A7DF2}" 15 | EndProject 16 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AdapterPattern", "AdapterPattern\AdapterPattern.csproj", "{89CDD96A-D34A-41E8-A0A3-7B47C67C56CF}" 17 | EndProject 18 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BridgePattern", "BridgePattern\BridgePattern.csproj", "{8F9283E5-7EE1-4125-9CFB-FB6C380240D5}" 19 | EndProject 20 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CompositePattern", "CompositePattern\CompositePattern.csproj", "{3CFAA453-5386-4A9E-9DDA-20A0DC8F700D}" 21 | EndProject 22 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FacadePattern", "FacadePattern\FacadePattern.csproj", "{8E91875D-E79F-4D16-9FFC-49BD5BE7DF03}" 23 | EndProject 24 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DecoratorPattern", "DecoratorPattern\DecoratorPattern.csproj", "{E16867D5-A235-437D-ADBF-8A4418E7038B}" 25 | EndProject 26 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FlyweightPattern", "FlyweightPattern\FlyweightPattern.csproj", "{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}" 27 | EndProject 28 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ProxyPattern", "ProxyPattern\ProxyPattern.csproj", "{CE4E3751-C4D9-440E-9E25-3E7EA61F4A7D}" 29 | EndProject 30 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ChainOfResponsibilityPattern", "ChainOfResponsibilityPattern\ChainOfResponsibilityPattern.csproj", "{E94F9FB8-B495-4A85-BAB4-0B08C69BA2D9}" 31 | EndProject 32 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CommandPattern", "CommandPattern\CommandPattern.csproj", "{25E92DA1-1205-4D53-85F4-B77BC92DCF5A}" 33 | EndProject 34 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "IteratorPattern", "IteratorPattern\IteratorPattern.csproj", "{BB1AE146-315A-44F8-A90B-77E386C65678}" 35 | EndProject 36 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MediatorPattern", "MediatorPattern\MediatorPattern.csproj", "{A6278444-3DDF-4175-996C-361E536668FC}" 37 | EndProject 38 | Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MementoPattern", "Memento\MementoPattern.csproj", "{93F0318A-696F-4C09-800F-7091BAEC2178}" 39 | EndProject 40 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ObserverPattern", "ObserverPattern\ObserverPattern.csproj", "{88754C6C-4DA4-4C4B-8E53-4DDD9425A387}" 41 | EndProject 42 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VisitorPattern", "VisitorPattern\VisitorPattern.csproj", "{C33B3A5D-E92B-455B-A9CD-4DFB6DF985A6}" 43 | EndProject 44 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StrategyPattern", "StrategyPattern\StrategyPattern.csproj", "{FCF7B59D-63F0-4BE3-AE39-3EA7D562A67E}" 45 | EndProject 46 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StatePattern", "StatePattern\StatePattern.csproj", "{606D9229-082C-4A71-8DD3-1918A14B7CF2}" 47 | EndProject 48 | 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/FacadePattern/FacadePattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /FacadePattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace FacadePattern 4 | { 5 | class Computer 6 | { 7 | public void GetElectricShock() 8 | { 9 | Console.Write("Ouch!"); 10 | } 11 | 12 | public void MakeSound() 13 | { 14 | Console.Write("Beep beep!"); 15 | } 16 | 17 | public void ShowLoadingScreen() 18 | { 19 | Console.Write("Loading.."); 20 | } 21 | 22 | public void Bam() 23 | { 24 | Console.Write("Ready to be used!"); 25 | } 26 | 27 | public void CloseEverything() 28 | { 29 | Console.Write("Bup bup bup buzzzz!"); 30 | } 31 | 32 | public void Sooth() 33 | { 34 | Console.Write("Zzzzz"); 35 | } 36 | 37 | public void PullCurrent() 38 | { 39 | Console.Write("Haaah!"); 40 | } 41 | } 42 | 43 | class ComputerFacade 44 | { 45 | private readonly Computer mComputer; 46 | 47 | public ComputerFacade(Computer computer) 48 | { 49 | this.mComputer = computer ?? throw new ArgumentNullException("computer", "computer cannot be null"); 50 | } 51 | 52 | public void TurnOn() 53 | { 54 | mComputer.GetElectricShock(); 55 | mComputer.MakeSound(); 56 | mComputer.ShowLoadingScreen(); 57 | mComputer.Bam(); 58 | } 59 | 60 | public void TurnOff() 61 | { 62 | mComputer.CloseEverything(); 63 | mComputer.PullCurrent(); 64 | mComputer.Sooth(); 65 | } 66 | } 67 | class Program 68 | { 69 | static void Main(string[] args) 70 | { 71 | var computer = new ComputerFacade(new Computer()); 72 | computer.TurnOn(); // Ouch! Beep beep! Loading.. Ready to be used! 73 | Console.WriteLine(); 74 | computer.TurnOff(); // Bup bup buzzz! Haah! Zzzzz 75 | Console.ReadLine(); 76 | } 77 | } 78 | } 79 | -------------------------------------------------------------------------------- /FactoryMethodPattern/FactoryMethodPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /FactoryMethodPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace FactoryMethodPattern 4 | { 5 | interface IInterviewer 6 | { 7 | void AskQuestions(); 8 | } 9 | 10 | class Developer : IInterviewer 11 | { 12 | public void AskQuestions() 13 | { 14 | Console.WriteLine("Asking about design patterns!"); 15 | } 16 | } 17 | 18 | class CommunityExecutive : IInterviewer 19 | { 20 | public void AskQuestions() 21 | { 22 | Console.WriteLine("Asking about community building!"); 23 | } 24 | } 25 | 26 | abstract class HiringManager 27 | { 28 | // Factory method 29 | abstract protected IInterviewer MakeInterviewer(); 30 | public void TakeInterview() 31 | { 32 | var interviewer = this.MakeInterviewer(); 33 | interviewer.AskQuestions(); 34 | } 35 | } 36 | 37 | class DevelopmentManager : HiringManager 38 | { 39 | protected override IInterviewer MakeInterviewer() 40 | { 41 | return new Developer(); 42 | } 43 | } 44 | 45 | class MarketingManager : HiringManager 46 | { 47 | protected override IInterviewer MakeInterviewer() 48 | { 49 | return new CommunityExecutive(); 50 | } 51 | } 52 | 53 | class Program 54 | { 55 | static void Main(string[] args) 56 | { 57 | var devManager = new DevelopmentManager(); 58 | devManager.TakeInterview(); //Output : Asking about design patterns! 59 | 60 | var marketingManager = new MarketingManager(); 61 | marketingManager.TakeInterview();//Output : Asking about community building! 62 | 63 | Console.ReadLine(); 64 | } 65 | } 66 | } 67 | -------------------------------------------------------------------------------- /FactoryPattern/FactoryPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /FactoryPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace FactoryPattern 4 | { 5 | public interface IDoor 6 | { 7 | int GetHeight(); 8 | int GetWidth(); 9 | } 10 | 11 | public class WoodenDoor : IDoor 12 | { 13 | private int Height { get; set; } 14 | private int Width { get; set; } 15 | 16 | public WoodenDoor(int height, int width) 17 | { 18 | this.Height = height; 19 | this.Width = width; 20 | } 21 | 22 | public int GetHeight() 23 | { 24 | return this.Height; 25 | } 26 | public int GetWidth() 27 | { 28 | return this.Width; 29 | } 30 | } 31 | 32 | public static class DoorFactory 33 | { 34 | public static IDoor MakeDoor(int height, int width) 35 | { 36 | return new WoodenDoor(height, width); 37 | } 38 | } 39 | class Program 40 | { 41 | static void Main(string[] args) 42 | { 43 | var door = DoorFactory.MakeDoor(80, 30); 44 | Console.WriteLine("Height of Door : {0}", door.GetHeight()); 45 | Console.WriteLine("Width of Door : {0}", door.GetWidth()); 46 | Console.ReadLine(); 47 | } 48 | } 49 | } 50 | -------------------------------------------------------------------------------- /FlyweightPattern/FlyweightPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /FlyweightPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | 4 | namespace FlyweightPattern 5 | { 6 | class Program 7 | { 8 | // Anything that will be cached is flyweight. 9 | // Types of tea here will be flyweights. 10 | class KarakTea 11 | { 12 | } 13 | 14 | // Acts as a factory and saves the tea 15 | class TeaMaker 16 | { 17 | private Dictionary mAvailableTea = new Dictionary(); 18 | 19 | public KarakTea Make(string preference) 20 | { 21 | if (!mAvailableTea.ContainsKey(preference)) 22 | { 23 | mAvailableTea[preference] = new KarakTea(); 24 | } 25 | 26 | return mAvailableTea[preference]; 27 | } 28 | } 29 | 30 | class TeaShop 31 | { 32 | private Dictionary mOrders = new Dictionary(); 33 | private readonly TeaMaker mTeaMaker; 34 | 35 | public TeaShop(TeaMaker teaMaker) 36 | { 37 | mTeaMaker = teaMaker ?? throw new ArgumentNullException("teaMaker", "teaMaker cannot be null"); 38 | } 39 | 40 | public void TakeOrder(string teaType, int table) 41 | { 42 | mOrders[table] = mTeaMaker.Make(teaType); 43 | } 44 | 45 | public void Serve() 46 | { 47 | foreach (var table in mOrders.Keys) 48 | { 49 | Console.WriteLine("Serving Tea to table # {0}", table); 50 | } 51 | } 52 | } 53 | static void Main(string[] args) 54 | { 55 | var teaMaker = new TeaMaker(); 56 | var teaShop = new TeaShop(teaMaker); 57 | 58 | teaShop.TakeOrder("less sugar", 1); 59 | teaShop.TakeOrder("more milk", 2); 60 | teaShop.TakeOrder("without sugar", 5); 61 | 62 | teaShop.Serve(); 63 | Console.ReadLine(); 64 | } 65 | } 66 | } 67 | -------------------------------------------------------------------------------- /IteratorPattern/IteratorPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /IteratorPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections; 3 | using System.Collections.Generic; 4 | using System.Linq; 5 | 6 | namespace IteratorPattern 7 | { 8 | class RadioStation 9 | { 10 | private float mFrequency; 11 | 12 | public RadioStation(float frequency) 13 | { 14 | mFrequency = frequency; 15 | } 16 | 17 | public float GetFrequecy() 18 | { 19 | return mFrequency; 20 | } 21 | 22 | } 23 | 24 | class StationList : IEnumerable 25 | { 26 | List mStations = new List(); 27 | 28 | public RadioStation this[int index] 29 | { 30 | get { return mStations[index]; } 31 | set { mStations.Insert(index, value); } 32 | } 33 | 34 | public void Add(RadioStation station) 35 | { 36 | mStations.Add(station); 37 | } 38 | 39 | public void Remove(RadioStation station) 40 | { 41 | mStations.Remove(station); 42 | } 43 | 44 | public IEnumerator GetEnumerator() 45 | { 46 | return this.GetEnumerator(); 47 | } 48 | 49 | IEnumerator IEnumerable.GetEnumerator() 50 | { 51 | //Use can switch to this internal collection if you do not want to transform 52 | return mStations.GetEnumerator(); 53 | 54 | //use this if you want to transform the object before rendering 55 | //foreach (var x in mStations) 56 | //{ 57 | // yield return x; 58 | //} 59 | } 60 | } 61 | 62 | class Program 63 | { 64 | static void Main(string[] args) 65 | { 66 | var stations = new StationList(); 67 | var station1 = new RadioStation(89); 68 | stations.Add(station1); 69 | 70 | var station2 = new RadioStation(101); 71 | stations.Add(station2); 72 | 73 | var station3 = new RadioStation(102); 74 | stations.Add(station3); 75 | 76 | foreach (var x in stations) 77 | { 78 | Console.Write(x.GetFrequecy()); 79 | } 80 | 81 | var q = stations.Where(x => x.GetFrequecy() == 89).FirstOrDefault(); 82 | Console.WriteLine(q.GetFrequecy()); 83 | 84 | Console.ReadLine(); 85 | } 86 | } 87 | } 88 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Anupavan Muddana 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /MediatorPattern/MediatorPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /MediatorPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace MediatorPattern 4 | { 5 | interface IChatRoomMediator 6 | { 7 | void ShowMessage(User user, string message); 8 | } 9 | 10 | //Mediator 11 | class ChatRoom : IChatRoomMediator 12 | { 13 | public void ShowMessage(User user, string message) 14 | { 15 | Console.WriteLine("{0} [{1}]:{2}", DateTime.Now.ToString("MMMM dd, H:mm"), user.GetName(), message); 16 | } 17 | } 18 | 19 | class User 20 | { 21 | private string mName; 22 | private IChatRoomMediator mChatRoom; 23 | 24 | public User(string name, IChatRoomMediator chatroom) 25 | { 26 | mChatRoom = chatroom; 27 | mName = name; 28 | } 29 | 30 | public string GetName() 31 | { 32 | return mName; 33 | } 34 | 35 | public void Send(string message) 36 | { 37 | mChatRoom.ShowMessage(this, message); 38 | } 39 | } 40 | 41 | 42 | class Program 43 | { 44 | static void Main(string[] args) 45 | { 46 | var mediator = new ChatRoom(); 47 | 48 | var john = new User("John", mediator); 49 | var jane = new User("Jane", mediator); 50 | 51 | john.Send("Hi there!"); 52 | jane.Send("Hey!"); 53 | 54 | //April 14, 20:05[John]:Hi there! 55 | //April 14, 20:05[Jane]:Hey! 56 | 57 | Console.ReadLine(); 58 | } 59 | } 60 | } 61 | -------------------------------------------------------------------------------- /Memento/MementoPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /Memento/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace MementoPattern 4 | { 5 | class EditorMemento 6 | { 7 | private string mContent; 8 | 9 | public EditorMemento(string content) 10 | { 11 | mContent = content; 12 | } 13 | 14 | public string Content 15 | { 16 | get 17 | { 18 | return mContent; 19 | } 20 | } 21 | } 22 | 23 | class Editor { 24 | 25 | private string mContent = string.Empty; 26 | private EditorMemento memento; 27 | 28 | public Editor() 29 | { 30 | memento = new EditorMemento(string.Empty); 31 | } 32 | 33 | public void Type(string words) 34 | { 35 | mContent = String.Concat(mContent," ", words); 36 | } 37 | 38 | public string Content 39 | { 40 | get 41 | { 42 | return mContent; 43 | } 44 | } 45 | 46 | public void Save() 47 | { 48 | memento = new EditorMemento(mContent); 49 | } 50 | 51 | public void Restore() 52 | { 53 | mContent = memento.Content; 54 | } 55 | } 56 | 57 | 58 | class Program 59 | { 60 | static void Main(string[] args) 61 | { 62 | var editor = new Editor(); 63 | 64 | //Type some stuff 65 | editor.Type("This is the first sentence."); 66 | editor.Type("This is second."); 67 | 68 | // Save the state to restore to : This is the first sentence. This is second. 69 | editor.Save(); 70 | 71 | //Type some more 72 | editor.Type("This is thrid."); 73 | 74 | //Output the content 75 | Console.WriteLine(editor.Content); // This is the first sentence. This is second. This is third. 76 | 77 | //Restoring to last saved state 78 | editor.Restore(); 79 | 80 | Console.Write(editor.Content); // This is the first sentence. This is second 81 | 82 | Console.ReadLine(); 83 | } 84 | } 85 | } 86 | -------------------------------------------------------------------------------- /ObserverPattern/ObserverPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /ObserverPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | 4 | namespace ObserverPattern 5 | { 6 | class JobPost 7 | { 8 | public string Title { get; private set; } 9 | 10 | public JobPost(string title) 11 | { 12 | Title = title; 13 | } 14 | } 15 | class JobSeeker : IObserver 16 | { 17 | public string Name { get; private set; } 18 | 19 | public JobSeeker(string name) 20 | { 21 | Name = name; 22 | } 23 | 24 | //Method is not being called by JobPostings class currently 25 | public void OnCompleted() 26 | { 27 | //No Implementation 28 | } 29 | 30 | //Method is not being called by JobPostings class currently 31 | public void OnError(Exception error) 32 | { 33 | //No Implementation 34 | } 35 | 36 | public void OnNext(JobPost value) 37 | { 38 | Console.WriteLine("Hi {0} ! New job posted: {1}", Name, value.Title); 39 | } 40 | } 41 | 42 | class JobPostings : IObservable 43 | { 44 | private List> mObservers; 45 | private List mJobPostings; 46 | 47 | public JobPostings() 48 | { 49 | mObservers = new List>(); 50 | mJobPostings = new List(); 51 | } 52 | 53 | public IDisposable Subscribe(IObserver observer) 54 | { 55 | // Check whether observer is already registered. If not, add it 56 | if (!mObservers.Contains(observer)) 57 | { 58 | mObservers.Add(observer); 59 | } 60 | return new Unsubscriber(mObservers, observer); 61 | } 62 | 63 | private void Notify(JobPost jobPost) 64 | { 65 | foreach (var observer in mObservers) 66 | { 67 | observer.OnNext(jobPost); 68 | } 69 | } 70 | 71 | public void AddJob(JobPost jobPost) 72 | { 73 | mJobPostings.Add(jobPost); 74 | Notify(jobPost); 75 | } 76 | 77 | } 78 | 79 | internal class Unsubscriber : IDisposable 80 | { 81 | private List> mObservers; 82 | private IObserver mObserver; 83 | 84 | internal Unsubscriber(List> observers, IObserver observer) 85 | { 86 | this.mObservers = observers; 87 | this.mObserver = observer; 88 | } 89 | 90 | public void Dispose() 91 | { 92 | if (mObservers.Contains(mObserver)) 93 | mObservers.Remove(mObserver); 94 | } 95 | } 96 | 97 | 98 | class Program 99 | { 100 | static void Main(string[] args) 101 | { 102 | //Create Subscribers 103 | var johnDoe = new JobSeeker("John Doe"); 104 | var janeDoe = new JobSeeker("Jane Doe"); 105 | 106 | //Create publisher and attch subscribers 107 | var jobPostings = new JobPostings(); 108 | jobPostings.Subscribe(johnDoe); 109 | jobPostings.Subscribe(janeDoe); 110 | 111 | //Add a new job and see if subscribers get notified 112 | jobPostings.AddJob(new JobPost("Software Engineer")); 113 | 114 | //Output 115 | // Hi John Doe! New job posted: Software Engineer 116 | // Hi Jane Doe! New job posted: Software Engineer 117 | 118 | Console.ReadLine(); 119 | } 120 | } 121 | } 122 | -------------------------------------------------------------------------------- /PrototypePattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace PrototypePattern 4 | { 5 | class Sheep 6 | { 7 | public string Name { get; set; } 8 | 9 | public string Category { get; set; } 10 | 11 | public Sheep(string name, string category) 12 | { 13 | Name = name; 14 | Category = category; 15 | } 16 | 17 | public Sheep Clone() 18 | { 19 | return MemberwiseClone() as Sheep; 20 | } 21 | } 22 | 23 | class Program 24 | { 25 | static void Main(string[] args) 26 | { 27 | var original = new Sheep("Jolly", "Mountain Sheep"); 28 | Console.WriteLine(original.Name); // Jolly 29 | Console.WriteLine(original.Category); // Mountain Sheep 30 | 31 | var cloned = original.Clone(); 32 | cloned.Name = "Dolly"; 33 | Console.WriteLine(cloned.Name); // Dolly 34 | Console.WriteLine(cloned.Category); // Mountain Sheep 35 | Console.WriteLine(original.Name); // Dolly 36 | 37 | Console.ReadLine(); 38 | } 39 | } 40 | } 41 | -------------------------------------------------------------------------------- /PrototypePattern/PrototypePattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /ProxyPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace ProxyPattern 4 | { 5 | interface IDoor 6 | { 7 | void Open(); 8 | void Close(); 9 | } 10 | 11 | class LabDoor : IDoor 12 | { 13 | public void Close() 14 | { 15 | Console.WriteLine("Closing lab door"); 16 | } 17 | 18 | public void Open() 19 | { 20 | Console.WriteLine("Opening lab door"); 21 | } 22 | } 23 | 24 | class SecuredDoor 25 | { 26 | private IDoor mDoor; 27 | 28 | public SecuredDoor(IDoor door) 29 | { 30 | mDoor = door ?? throw new ArgumentNullException("door", "door can not be null"); 31 | } 32 | 33 | public void Open(string password) 34 | { 35 | if (Authenticate(password)) 36 | { 37 | mDoor.Open(); 38 | } 39 | else 40 | { 41 | Console.WriteLine("Big no! It ain't possible."); 42 | } 43 | } 44 | 45 | private bool Authenticate(string password) 46 | { 47 | return password == "$ecr@t" ? true : false; 48 | } 49 | 50 | public void Close() 51 | { 52 | mDoor.Close(); 53 | } 54 | } 55 | class Program 56 | { 57 | static void Main(string[] args) 58 | { 59 | var door = new SecuredDoor(new LabDoor()); 60 | door.Open("invalid"); // Big no! It ain't possible. 61 | 62 | door.Open("$ecr@t"); // Opening lab door 63 | door.Close(); // Closing lab door 64 | 65 | Console.ReadLine(); 66 | } 67 | } 68 | } 69 | -------------------------------------------------------------------------------- /ProxyPattern/ProxyPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # csharp-design-patterns-for-humans-examples 2 | Complete C# Examples Refereed in csharp-design-patterns-for-humans 3 | -------------------------------------------------------------------------------- /SingletonPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace SingletonPattern 4 | { 5 | public class President 6 | { 7 | static President instance; 8 | // Private constructor 9 | private President() 10 | { 11 | //Hiding the Constructor 12 | } 13 | 14 | // Public constructor 15 | public static President get_instance() 16 | { 17 | if (instance == null) { 18 | instance = new President(); 19 | } 20 | return instance; 21 | } 22 | } 23 | class Program 24 | { 25 | static void Main(string[] args) 26 | { 27 | President a = President.get_instance(); 28 | President b = President.get_instance(); 29 | 30 | Console.WriteLine((a==b).ToString()); 31 | Console.ReadLine(); 32 | } 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /SingletonPattern/SingletonPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /StatePattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace StatePattern 4 | { 5 | interface IWritingState 6 | { 7 | 8 | void Write(string words); 9 | 10 | } 11 | 12 | class UpperCase : IWritingState 13 | { 14 | public void Write(string words) 15 | { 16 | Console.WriteLine(words.ToUpper()); 17 | } 18 | } 19 | 20 | class LowerCase : IWritingState 21 | { 22 | public void Write(string words) 23 | { 24 | Console.WriteLine(words.ToLower()); 25 | } 26 | } 27 | 28 | class DefaultText : IWritingState 29 | { 30 | public void Write(string words) 31 | { 32 | Console.WriteLine(words); 33 | } 34 | } 35 | 36 | class TextEditor 37 | { 38 | 39 | private IWritingState mState; 40 | 41 | public TextEditor() 42 | { 43 | mState = new DefaultText(); 44 | } 45 | 46 | public void SetState(IWritingState state) 47 | { 48 | mState = state; 49 | } 50 | 51 | public void Type(string words) 52 | { 53 | mState.Write(words); 54 | } 55 | 56 | } 57 | 58 | class Program 59 | { 60 | static void Main(string[] args) 61 | { 62 | var editor = new TextEditor(); 63 | 64 | editor.Type("First line"); 65 | 66 | editor.SetState(new UpperCase()); 67 | 68 | editor.Type("Second Line"); 69 | editor.Type("Third Line"); 70 | 71 | editor.SetState(new LowerCase()); 72 | 73 | editor.Type("Fourth Line"); 74 | editor.Type("Fifthe Line"); 75 | 76 | // Output: 77 | // First line 78 | // SECOND LINE 79 | // THIRD LINE 80 | // fourth line 81 | // fifth line 82 | 83 | Console.ReadLine(); 84 | } 85 | } 86 | } 87 | -------------------------------------------------------------------------------- /StatePattern/StatePattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /StrategyPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | 4 | namespace StrategyPattern 5 | { 6 | interface ISortStrategy 7 | { 8 | List Sort(List dataset); 9 | } 10 | 11 | class BubbleSortStrategy : ISortStrategy 12 | { 13 | public List Sort(List dataset) 14 | { 15 | Console.WriteLine("Sorting using Bubble Sort !"); 16 | return dataset; 17 | } 18 | } 19 | 20 | class QuickSortStrategy : ISortStrategy 21 | { 22 | public List Sort(List dataset) 23 | { 24 | Console.WriteLine("Sorting using Quick Sort !"); 25 | return dataset; 26 | } 27 | } 28 | 29 | class Sorter 30 | { 31 | private readonly ISortStrategy mSorter; 32 | 33 | public Sorter(ISortStrategy sorter) 34 | { 35 | mSorter = sorter; 36 | } 37 | 38 | public List Sort(List unSortedList) 39 | { 40 | return mSorter.Sort(unSortedList); 41 | } 42 | } 43 | 44 | class Program 45 | { 46 | static void Main(string[] args) 47 | { 48 | var unSortedList = new List { 1, 10, 2, 16, 19 }; 49 | 50 | var sorter = new Sorter(new QuickSortStrategy()); 51 | sorter.Sort(unSortedList); // // Output : Sorting using Bubble Sort ! 52 | 53 | sorter = new Sorter(new QuickSortStrategy()); 54 | sorter.Sort(unSortedList); // // Output : Sorting using Quick Sort ! 55 | 56 | Console.ReadLine(); 57 | } 58 | } 59 | } 60 | -------------------------------------------------------------------------------- /StrategyPattern/StrategyPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /TemplateMethodPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace TemplateMethodPattern 4 | { 5 | abstract class Builder 6 | { 7 | // Template method 8 | public void Build() 9 | { 10 | Test(); 11 | Lint(); 12 | Assemble(); 13 | Deploy(); 14 | } 15 | 16 | abstract public void Test(); 17 | abstract public void Lint(); 18 | abstract public void Assemble(); 19 | abstract public void Deploy(); 20 | } 21 | 22 | class AndroidBuilder : Builder 23 | { 24 | public override void Assemble() 25 | { 26 | Console.WriteLine("Assembling the android build"); 27 | } 28 | 29 | public override void Deploy() 30 | { 31 | Console.WriteLine("Deploying android build to server"); 32 | } 33 | 34 | public override void Lint() 35 | { 36 | Console.WriteLine("Linting the android code"); 37 | } 38 | 39 | public override void Test() 40 | { 41 | Console.WriteLine("Running android tests"); 42 | } 43 | } 44 | 45 | 46 | class IosBuilder : Builder 47 | { 48 | public override void Assemble() 49 | { 50 | Console.WriteLine("Assembling the ios build"); 51 | } 52 | 53 | public override void Deploy() 54 | { 55 | Console.WriteLine("Deploying ios build to server"); 56 | } 57 | 58 | public override void Lint() 59 | { 60 | Console.WriteLine("Linting the ios code"); 61 | } 62 | 63 | public override void Test() 64 | { 65 | Console.WriteLine("Running ios tests"); 66 | } 67 | } 68 | 69 | class Program 70 | { 71 | static void Main(string[] args) 72 | { 73 | var androidBuilder = new AndroidBuilder(); 74 | androidBuilder.Build(); 75 | 76 | // Output: 77 | // Running android tests 78 | // Linting the android code 79 | // Assembling the android build 80 | // Deploying android build to server 81 | 82 | var iosBuilder = new IosBuilder(); 83 | iosBuilder.Build(); 84 | 85 | // Output: 86 | // Running ios tests 87 | // Linting the ios code 88 | // Assembling the ios build 89 | // Deploying ios build to server 90 | 91 | Console.ReadLine(); 92 | } 93 | } 94 | } 95 | -------------------------------------------------------------------------------- /TemplateMethodPattern/TemplateMethodPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /VisitorPattern/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace VisitorPattern 4 | { 5 | // Visitee 6 | interface IAnimal 7 | { 8 | void Accept(IAnimalOperation operation); 9 | } 10 | 11 | // Visitor 12 | interface IAnimalOperation 13 | { 14 | void VisitMonkey(Monkey monkey); 15 | void VisitLion(Lion lion); 16 | void VisitDolphin(Dolphin dolphin); 17 | } 18 | 19 | class Monkey : IAnimal 20 | { 21 | public void Shout() 22 | { 23 | Console.WriteLine("Oooh o aa aa!"); 24 | } 25 | 26 | public void Accept(IAnimalOperation operation) 27 | { 28 | operation.VisitMonkey(this); 29 | } 30 | } 31 | 32 | class Lion : IAnimal 33 | { 34 | public void Roar() 35 | { 36 | Console.WriteLine("Roaar!"); 37 | } 38 | 39 | public void Accept(IAnimalOperation operation) 40 | { 41 | operation.VisitLion(this); 42 | } 43 | } 44 | 45 | class Dolphin : IAnimal 46 | { 47 | public void Speak() 48 | { 49 | Console.WriteLine("Tuut tittu tuutt!"); 50 | } 51 | 52 | public void Accept(IAnimalOperation operation) 53 | { 54 | operation.VisitDolphin(this); 55 | } 56 | } 57 | 58 | class Speak : IAnimalOperation 59 | { 60 | public void VisitDolphin(Dolphin dolphin) 61 | { 62 | dolphin.Speak(); 63 | } 64 | 65 | public void VisitLion(Lion lion) 66 | { 67 | lion.Roar(); 68 | } 69 | 70 | public void VisitMonkey(Monkey monkey) 71 | { 72 | monkey.Shout(); 73 | } 74 | } 75 | 76 | class Jump : IAnimalOperation 77 | { 78 | public void VisitDolphin(Dolphin dolphin) 79 | { 80 | Console.WriteLine("Walked on water a little and disappeared!"); 81 | } 82 | 83 | public void VisitLion(Lion lion) 84 | { 85 | Console.WriteLine("Jumped 7 feet! Back on the ground!"); 86 | } 87 | 88 | public void VisitMonkey(Monkey monkey) 89 | { 90 | Console.WriteLine("Jumped 20 feet high! on to the tree!"); 91 | } 92 | } 93 | 94 | 95 | class Program 96 | { 97 | static void Main(string[] args) 98 | { 99 | var monkey = new Monkey(); 100 | var lion = new Lion(); 101 | var dolphin = new Dolphin(); 102 | 103 | var speak = new Speak(); 104 | 105 | monkey.Accept(speak); // Ooh oo aa aa! 106 | lion.Accept(speak); // Roaaar! 107 | dolphin.Accept(speak); // Tuut tutt tuutt! 108 | 109 | var jump = new Jump(); 110 | 111 | monkey.Accept(speak); // Ooh oo aa aa! 112 | monkey.Accept(jump); // Jumped 20 feet high! on to the tree! 113 | 114 | lion.Accept(speak); // Roaaar! 115 | lion.Accept(jump); // Jumped 7 feet! Back on the ground! 116 | 117 | dolphin.Accept(speak); // Tuut tutt tuutt! 118 | dolphin.Accept(jump); // Walked on water a little and disappeared 119 | 120 | Console.ReadLine(); 121 | } 122 | } 123 | } 124 | -------------------------------------------------------------------------------- /VisitorPattern/VisitorPattern.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp2.0 6 | 7 | 8 | 9 | --------------------------------------------------------------------------------