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Abhishek Kumar Singh
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Design Patterns
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‎.gitignore‎

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*.vscode/
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*bin/
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*obj/
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*.out/
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*.vs/

‎AbstractFactory.cs‎

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namespace DesignPatterns.AbstractFactory
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{
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// Abstract Products
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interface IPizza
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{
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string Eat();
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}
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interface IBurger
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{
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string Eat();
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}
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// Concrete Products
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class VegPizza : IPizza
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{
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public string Eat()
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{
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return "Eating Veg Pizza";
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}
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}
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class NonVegPizza : IPizza
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{
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public string Eat()
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{
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return "Eating Non-Veg Pizza";
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}
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}
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class VegBurger : IBurger
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{
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public string Eat()
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{
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return "Eating Veg Burger";
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}
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}
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class NonVegBurger : IBurger
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{
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public string Eat()
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{
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return "Eating Non-Veg Burger";
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}
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}
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// Abstract Factory
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interface IChef
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{
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IPizza PreparePizza();
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IBurger PrepareBurger();
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}
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// Concrete Factories
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class VegChef : IChef
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{
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public IPizza PreparePizza()
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{
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return new VegPizza();
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}
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public IBurger PrepareBurger()
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{
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return new VegBurger();
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}
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}
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class NonVegChef : IChef
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{
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public IPizza PreparePizza()
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{
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return new NonVegPizza();
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}
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public IBurger PrepareBurger()
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{
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return new NonVegBurger();
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}
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}
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// Factory Producer
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class Waiter
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{
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private readonly IChef _chef;
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public Waiter(string pref)
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{
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if (pref == "Veg")
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_chef = new VegChef();
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else
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_chef = new NonVegChef();
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}
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public string GetPrizza()
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{
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return _chef.PreparePizza().Eat();
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}
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public string GetBurger()
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{
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return _chef.PrepareBurger().Eat();
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}
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}
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}

‎Adapter.cs‎

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using System;
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namespace DesignPatterns.AdapterPattern
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{
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// 1. Target interface - What your app expects
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public interface ILogger
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{
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void LogInfo(string msg);
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}
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// Your own logger implementation
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public class Log : ILogger
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{
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public void LogInfo(string msg)
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{
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Console.WriteLine(msg);
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}
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}
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// 2. Adaptee (3rd party NuGet package class - cannot be modified!)
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public class ThirdPartyLogger
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{
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public void WriteLog(string severity, string msg)
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{
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Console.WriteLine("[{0}] {1}", severity, msg);
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}
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}
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// 3. Adapter - makes ThirdPartyLogger fit ILogger interface
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public class LoggerAdapter : ILogger
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{
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private readonly ThirdPartyLogger _thirdPartyLogger;
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public LoggerAdapter(ThirdPartyLogger thirdPartyLogger)
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{
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_thirdPartyLogger = thirdPartyLogger;
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}
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public void LogInfo(string msg)
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{
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// Converts ILogger's expected method into the ThirdPartyLogger call
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string severity = "Info";
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_thirdPartyLogger.WriteLog(severity, msg);
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}
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}
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}

‎App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
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</startup>
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</configuration>

‎DesignPatterns.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{F115DBF7-ED9F-4FBD-A985-F1ED267F3322}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<RootNamespace>DesignPatterns</RootNamespace>
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<AssemblyName>DesignPatterns</AssemblyName>
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<TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
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<Deterministic>true</Deterministic>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="AbstractFactory.cs" />
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<Compile Include="Adapter.cs" />
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<Compile Include="Factory.cs" />
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="Singleton.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎DesignPatterns.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.14.36401.2 d17.14
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DesignPatterns", "DesignPatterns.csproj", "{F115DBF7-ED9F-4FBD-A985-F1ED267F3322}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{F115DBF7-ED9F-4FBD-A985-F1ED267F3322}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{F115DBF7-ED9F-4FBD-A985-F1ED267F3322}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{F115DBF7-ED9F-4FBD-A985-F1ED267F3322}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{F115DBF7-ED9F-4FBD-A985-F1ED267F3322}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {1162DD92-68AB-422C-AD94-9D7539E2EC45}
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EndGlobalSection
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EndGlobal

‎Factory.cs‎

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namespace DesignPatterns.Factory
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{
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// Abstract Product
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interface IPizza
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{
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string Eat();
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}
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// Concrete Products
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class VegPizza : IPizza
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{
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public string Eat()
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{
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return "Eating veg pizza";
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}
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}
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class NonVegPizza : IPizza
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{
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public string Eat()
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{
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return "Eating Non-veg pizza";
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}
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}
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// Abstract Factory
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interface IChef
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{
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IPizza PreparePizza();
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}
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// Concrete Factories
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class VegChef : IChef
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{
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public IPizza PreparePizza()
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{
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return new VegPizza();
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}
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}
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class NonVegChef : IChef
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{
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public IPizza PreparePizza()
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{
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return new NonVegPizza();
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}
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}
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// Factory Producer
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class Waiter
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{
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private IChef _chef;
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public string GetPizza(string pref)
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{
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if (pref == "Veg")
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_chef = new VegChef();
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else
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_chef = new NonVegChef();
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return _chef.PreparePizza().Eat();
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}
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}
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}

‎Program.cs‎

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//using DesignPatterns;
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using DesignPatterns.AdapterPattern;
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//using DesignPatterns.Factory;
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using System;
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// using DesignPatterns.AbstractFactory;
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namespace DesignPatterns
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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// Singleton
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//Singleton singleton = Singleton.GetInstance();
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// Consumer or Client
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// Factory Pattern
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//Waiter waiter = new Waiter();
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//Console.WriteLine(waiter.GetPizza("Veg"));
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// Abstract Factory Pattern
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//Waiter waiter = new Waiter("Veg");
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//Console.WriteLine(waiter.GetPrizza());
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//Console.WriteLine(waiter.GetBurger());
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// Adapter Design Patter
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// 4. Client - your application
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// Normally, client code depends only on ILogger
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ILogger logger = new LoggerAdapter(new ThirdPartyLogger());
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// Behind the scenes, Adapter redirects to ThirdPartyLogger.WriteLog()
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logger.LogInfo("Behind the scenes, calling WriteLog() from ThirdPartyLogger.");
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}
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}
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}

‎Properties/AssemblyInfo.cs‎

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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("DesignPatterns")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("Hexagon capability center")]
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[assembly: AssemblyProduct("DesignPatterns")]
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[assembly: AssemblyCopyright("Copyright © Hexagon capability center 2025")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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// The following GUID is for the ID of the typelib if this project is exposed to COM
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[assembly: Guid("f115dbf7-ed9f-4fbd-a985-f1ed267f3322")]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

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