.net 6 BuildServiceProvider is missing

Question

net 6, create console application with 'minimal template'. try add DI but BuildServiceProvider is missing. I try google about how migrate ServiceCollection but did not find nothing.

var services2 = new ServiceCollection();
var serviceProvider = services2.BuildServiceProvider();

Answer 1

In my idiotic case, I was using Microsoft.Extensions.DependencyInjection.Abstractions instead of Microsoft.Extensions.DependencyInjection. I didn't notice at first because ServiceCollection, AddSingleton etc were available using the first NuGet as well. Icon and author are the same for both NuGets.

Answer 2

The following two steps fixed it for me (VS2022, .NET Standard 2.0):

1. Make sure all your projects are referring to the same version of Microsoft.Extensions.DependencyInjection. At the time of this writing, the latest version is 7.0.0. You can use Consolidate tab in solution's Nuget Configuration page to achieve this.
2. Go to project's Nuget Configuration page (and not Solution's Nuget Configuration page) by right-clicking the problematic project and choosing Manage Nuget Packages. Therein, uninstall Microsoft.Extensions.DependencyInjection and then re-install it (again making sure you're using the same version as other projects in the solution).

Rebuild the solution after this and things should look good.