How to configure true dependency injection in System.CommandLine

• tye

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  Discontinued Tye is a tool that makes developing, testing, and deploying microservices and distributed applications easier. Project Tye includes a local orchestrator to make developing microservices easier and the ability to deploy microservices to Kubernetes with minimal configuration.

  

System.CommandLine is the official .NET library that provides common functionality for command-line applications. This includes features like argument parsing, automatic help text generation, tab autocomplete, suggestions, corrections, sub-commands, user cancellation, and much more. Many official .NET tools are built on top of System.CommandLine, including the .NET CLI, Kiota, Tye, numerous Azure tools, and other .NET additional tools.

• command-line-api

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  Command line parsing, invocation, and rendering of terminal output.

  

using System.CommandLine.Invocation; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.DependencyInjection.Extensions; namespace System.CommandLine.Builder; internal static class DependencyInjectionMiddleware { public static CommandLineBuilder UseDependencyInjection(this CommandLineBuilder builder, Action configureServices) { return UseDependencyInjection(builder, (_, services) => configureServices(services)); } // This overload allows you to conditionally register services based on the command line invocation context // in order to improve startup time when you have a lot of services to register. public static CommandLineBuilder UseDependencyInjection(this CommandLineBuilder builder, Action configureServices) { return builder.AddMiddleware(async (context, next) => { // Register our services in the modern Microsoft dependency injection container var services = new ServiceCollection(); configureServices(context, services); var uniqueServiceTypes = new HashSet(services.Select(x => x.ServiceType)); services.TryAddSingleton(context.Console); await using var serviceProvider = services.BuildServiceProvider(); // System.CommandLine's service provider is a "fake" implementation that relies on a dictionary of factories, // but we can still make sure here that "true" dependency-injected services are available from "context.BindingContext". // https://github.com/dotnet/command-line-api/blob/2.0.0-beta4.22272.1/src/System.CommandLine/Invocation/ServiceProvider.cs context.BindingContext.AddService(_ => serviceProvider); foreach (var serviceType in uniqueServiceTypes) { context.BindingContext.AddService(serviceType, _ => serviceProvider.GetRequiredService(serviceType)); // Enable support for "context.BindingContext.GetServices<>()" as in the modern dependency injection var enumerableServiceType = typeof(IEnumerable<>).MakeGenericType(serviceType); context.BindingContext.AddService(enumerableServiceType, _ => serviceProvider.GetServices(serviceType)); } await next(context); }); } }

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Fortunately, System.CommandLine (in its current version, 2.0.0-beta4.22272.1) is highly extensible. In this blog post, I'll show you how to integrate true dependency injection using the official Microsoft.Extensions.DependencyInjection NuGet package.

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