How to create a child scope from the parent with default dependency injection in .NET Core?

Question

I am building a console .NET Core application. It periodically runs a method that does some work. How do I make ServiceProvider behave in the same way it behaves in ASP.NET Core apps. I want it to resolve scoped services when the method begins it's execution and dispose the resolved services at the end of the method.

// pseudocode  globalProvider.AddScoped<ExampleService>();  // ...  using (var scopedProvider = globalProvider.CreateChildScope()) {     var exampleService = scopedProvider.Resolve<ExampleService>(); } 

Answer 1

Use IServiceProvider.CreateScope() method to create a local scope:

var services = new ServiceCollection(); services.AddScoped<ExampleService>(); var globalProvider = services.BuildServiceProvider();  using (var scope = globalProvider.CreateScope()) {     var localScoped = scope.ServiceProvider.GetService<ExampleService>();      var globalScoped = globalProvider.GetService<ExampleService>(); } 

It can be easily tested:

using (var scope = globalProvider.CreateScope()) {     var localScopedV1 = scope.ServiceProvider.GetService<ExampleService>();     var localScopedV2 = scope.ServiceProvider.GetService<ExampleService>();     Assert.Equal(localScopedV1, localScopedV2);      var globalScoped = globalProvider.GetService<ExampleService>();     Assert.NotEqual(localScopedV1, globalScoped);     Assert.NotEqual(localScopedV2, globalScoped); } 

Documentation: Service Lifetimes and Registration Options.

Reference Microsoft.Extensions.DependencyInjection or just Microsoft.AspNetCore.All package to use the code above.