├── .gitignore ├── LICENSE ├── README.md └── src ├── StrategyPatternExample.sln └── StrategyPatternExample ├── GlobalUsings.cs ├── IMathOperator.cs ├── IMathStrategy.cs ├── MathStrategy.cs ├── Operator.cs ├── Operators ├── AddOperator.cs ├── DivideOperator.cs ├── MultipleOperator.cs └── SubtractOperator.cs ├── Program.cs └── StrategyPatternExample.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 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2018 Adam Storr 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 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Strategy Pattern Examples 2 | 3 | This repository was originally constructed in the ASP.NET Core 2.0 timeframe. Is has subsequently been updated to .NET 7 using filescoped namespaces, top-level functions and minimal API constructs. 4 | 5 | The different branches relate to the specific blog posts below. 6 | 7 | https://adamstorr.azurewebsites.net/blog/aspnetcore-and-the-strategy-pattern 8 | https://adamstorr.azurewebsites.net/blog/aspnetcore-and-the-strategy-pattern-continued 9 | https://adamstorr.azurewebsites.net/blog/strategy-pattern-with-enum-constraints 10 | https://adamstorr.azurewebsites.net/blog/strategy-pattern-with-full-generic-constaints -------------------------------------------------------------------------------- /src/StrategyPatternExample.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.27428.1 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StrategyPatternExample", "StrategyPatternExample\StrategyPatternExample.csproj", "{33A47031-B45D-4CF2-8EA3-7404D506E258}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {33A47031-B45D-4CF2-8EA3-7404D506E258}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {33A47031-B45D-4CF2-8EA3-7404D506E258}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {33A47031-B45D-4CF2-8EA3-7404D506E258}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {33A47031-B45D-4CF2-8EA3-7404D506E258}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {A3DE0886-9786-4EA9-941E-6D4F6DFF70EA} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /src/StrategyPatternExample/GlobalUsings.cs: -------------------------------------------------------------------------------- 1 | global using Microsoft.AspNetCore.Builder; 2 | global using Microsoft.AspNetCore.Http; 3 | global using Microsoft.Extensions.DependencyInjection; 4 | global using StrategyPatternExample; -------------------------------------------------------------------------------- /src/StrategyPatternExample/IMathOperator.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPatternExample; 2 | 3 | public interface IMathOperator 4 | { 5 | Operator Operator { get; } 6 | 7 | int Calculate(int a, int b); 8 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/IMathStrategy.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPatternExample; 2 | 3 | public interface IMathStrategy 4 | { 5 | int Calculate(int a, int b, Operator op); 6 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/MathStrategy.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Linq; 4 | 5 | namespace StrategyPatternExample; 6 | 7 | public class MathStrategy : IMathStrategy 8 | { 9 | private readonly IEnumerable _operators; 10 | 11 | public MathStrategy(IEnumerable operators) => _operators = operators; 12 | 13 | public int Calculate(int a, int b, Operator op) 14 | => _operators.FirstOrDefault(x => x.Operator == op)?.Calculate(a, b) ?? throw new ArgumentNullException(nameof(op)); 15 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/Operator.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPatternExample; 2 | 3 | public enum Operator 4 | { 5 | Add, 6 | Substract, 7 | Multiple, 8 | Divide 9 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/Operators/AddOperator.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPatternExample.Operators; 2 | 3 | public class AddOperator : IMathOperator 4 | { 5 | public Operator Operator => Operator.Add; 6 | 7 | public int Calculate(int a, int b) => a + b; 8 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/Operators/DivideOperator.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | 3 | namespace StrategyPatternExample.Operators; 4 | 5 | public class DivideOperator : IMathOperator 6 | { 7 | public Operator Operator => Operator.Divide; 8 | 9 | public int Calculate(int a, int b) 10 | { 11 | if (b == 0) 12 | { 13 | throw new DivideByZeroException(); 14 | } 15 | 16 | return a / b; 17 | } 18 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/Operators/MultipleOperator.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPatternExample.Operators; 2 | 3 | public class MultipleOperator : IMathOperator 4 | { 5 | public Operator Operator => Operator.Multiple; 6 | 7 | public int Calculate(int a, int b) => a * b; 8 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/Operators/SubtractOperator.cs: -------------------------------------------------------------------------------- 1 | namespace StrategyPatternExample.Operators; 2 | 3 | public class SubtractOperator : IMathOperator 4 | { 5 | public Operator Operator => Operator.Substract; 6 | 7 | public int Calculate(int a, int b) => a - b; 8 | } -------------------------------------------------------------------------------- /src/StrategyPatternExample/Program.cs: -------------------------------------------------------------------------------- 1 | using StrategyPatternExample.Operators; 2 | 3 | var builder = WebApplication.CreateBuilder(args); 4 | 5 | builder.Services.AddScoped(); 6 | builder.Services.AddScoped(); 7 | builder.Services.AddScoped(); 8 | builder.Services.AddScoped(); 9 | builder.Services.AddScoped(); 10 | 11 | var app = builder.Build(); 12 | app.UseHttpsRedirection(); 13 | 14 | app.MapGet("/", (IMathStrategy strategy) => 15 | { 16 | int a = 10; 17 | int b = 5; 18 | int result = strategy.Calculate(a, b, Operator.Add); 19 | return Results.Ok(result.ToString()); 20 | }); 21 | 22 | app.Run(); -------------------------------------------------------------------------------- /src/StrategyPatternExample/StrategyPatternExample.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | net7.0 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | --------------------------------------------------------------------------------