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dodygdodyg
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WIP keyed service from Minimal API
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‎projects/.net8/keyed-service/Program.cs

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var builder = WebApplication.CreateBuilder();
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builder.Services.AddKeyedSingleton<IGreeting, MorningGreeting>("morning");
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builder.Services.AddKeyedSingleton<IGreeting, DayGreeting>("day");
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builder.Services.AddKeyedSingleton<IGreeting, EveningGreeting>("evening");
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var app = builder.Build();
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app.MapGet("/", (IKeyedServiceProvider provider) =>
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{
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string GetServiceKey()
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{
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var currentTime = DateTime.Now;
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if (currentTime.Hour < 12)
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return "morning";
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else if (currentTime.Hour < 18)
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return "day";
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else
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return "evening";
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}
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var key = GetServiceKey();
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var greeting = provider.GetRequiredKeyedService<IGreeting>(key);
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return Results.Content("""
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<html>
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<body>
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{{ greeting.Message }}}
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</body>
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</html>
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""", "text/html");
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});
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app.Run();
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interface IGreeting
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{
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string Message { get; }
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}
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public class MorningGreeting : IGreeting
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{
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public string Message => "Good morning";
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}
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public class DayGreeting : IGreeting
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{
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public string Message => "Good day";
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}
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public class EveningGreeting : IGreeting
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{
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public string Message => "Good evening";
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}
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‎projects/.net8/keyed-service/README.md

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# Using Keyed Service with Minimal API
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Use `IKeyedServiceProvider.GetRequiredKeyedService<T>(key)` to get different type of implementation instances based on string key.

‎projects/.net8/keyed-service/keyed-service.csproj

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>true</ImplicitUsings>
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<LangVersion>preview</LangVersion>
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<PreviewFeatures>true</PreviewFeatures>
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</PropertyGroup>
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</Project>

‎projects/.net8/keyed-service/keyed-service.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 = 17.5.002.0
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "keyed-service", "keyed-service.csproj", "{1A4EF9A9-14AE-464D-8431-B35DA014E9D7}"
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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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{1A4EF9A9-14AE-464D-8431-B35DA014E9D7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{1A4EF9A9-14AE-464D-8431-B35DA014E9D7}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{1A4EF9A9-14AE-464D-8431-B35DA014E9D7}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{1A4EF9A9-14AE-464D-8431-B35DA014E9D7}.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 = {2D48A138-5215-428D-8CF4-56F21D0D4194}
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EndGlobalSection
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EndGlobal

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