Cannot find FromKeyedServices

Question

I'm using a new .Net 8, and I'm trying to inject some service with a new way of keyed services, but unfortunately i cannot find FromKeyedServices, is not found, it's belong to Microsoft.Extensions.DependencyInjection namespace, i added this but still i don't see it.

using Microsoft.Extensions.DependencyInjection;

namespace SMSService.Persistence.ContextFactories
{
   public class ApplicationDbContextFactory<TDbContext>
    {
        private readonly IConfiguration _configuration;
        private readonly DbContextOptionsBuilder<TDbContext> _optionsBuilder;

        public ApplicationDbContextFactory(
            IConfiguration configuration,  [FromKeyedServices("Sql")] IDbContextOptionBuilder dbContextOptionBuilder ,           ILogger<ApplicationDbContextFactory<TDbContext>> logger)
        {

Can anyone help me

Are you sure it is a .NET 8 app? Since .NET 8 has not yet been released, have you definitely downloaded the pre-release SDK? Is the project file set up correctly? — DavidG, Aug 31 '23 at 12:27
What is the type of project this code is in? Console? Library? ASP.NET Core? — Guru Stron, Aug 31 '23 at 12:30
Does the class library have a reference to `Microsoft.Extensions.DependencyInjection.Abstractions`? — DavidG, Aug 31 '23 at 12:40
Well there you go, fortunately Guru added my comment as an answer. — DavidG, Aug 31 '23 at 12:53

Guru Stron · Accepted Answer · 2023-08-31T12:50:12.323

0

DI and FromKeyedServicesAttribute (since it's introduction in .NET 8 preview) in particular is part of the platform extensions which is not included by default in some of the project types (for example for Microsoft.NET.Sdk.Web SDK it will be included by default but for class library - will not).

For class library project install Microsoft.Extensions.DependencyInjection.Abstractions nuget.

edited Aug 31 '23 at 12:50

answered Aug 31 '23 at 12:44

Guru Stron

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Cannot find FromKeyedServices

1 Answers1