How to use IOptions pattern in Program.cs in .NET6, before builder.build()?

Question

Using the options pattern in .NET6, I can get access to some config values as follows:

builder.Services.Configure<ApiConfiguration>(
    builder.Configuration.GetSection(ApiConfiguration.Api));

var app = builder.Build();

var options = app.Services.GetRequiredService<IOptions<ApiConfiguration>>().Value;

However, I would like to get the Options before builder.Build(), so I can use the appSettings values when adding some Services to the ServiceCollections.

I haven't been able to find it anywhere yet, so I am wondering if it is even possible (and how ofcourse :D )

Answer 1

In the default DI container services can't be resolved before it is built and building the container multiple times is not a recommended approach (for multiple reasons). If you need settings before the application is built you can access them without the options pattern:

var settings = builder.Configuration
    .GetSection(ApiConfiguration.Api)
    .Get<ApiConfiguration>();