Configuration doesn't pick connection string from secrets.json file in ASP NET Core MVC 6.0 lts - asp.net-core-mvc

Question

I created ASP NET Core MVC 6 lts app with individual user accounts with Visual Studio 2022 preview 6.0. I moved connection string from appsettings.json to secrets.json. I start the app with IIS Express and apply migrations from exception page that opens. It works.
But when I try to apply additional migrations from Package Manager Console I get an error "connectionString can't be null".
Add services to the container. This is from Program.cs:
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();
This is appsettings.json, connection string value removed:
"ConnectionStrings": {
"DefaultConnection": ""
},
This is Secrets.json:
{
"ConnectionStrings": {
"DefaultConnection": "Data Source=DESKTOP-HIPPIDT;Initial Catalog=KehittajaLocalDb;Integrated Security=True;MultipleActiveResultSets=True"
}
}

Answer 1

In .NET 6,
You do not need to specify AddUserSecrets<>.
As mentioned here ,
WebApplication.CreateBuilder initializes a new instance of the
WebApplicationBuilder class with preconfigured defaults. The
initialized WebApplicationBuilder (builder) provides default
configuration and calls AddUserSecrets when the EnvironmentName is
Development
All you need to do is get the connection string from the builder.Configuration like below:
var dbConnectionString = builder.Configuration["ConnectionStrings:DevelopmentConnection"];
Then, you can specify the connection with AddDbContext<>:
builder.Services.AddDbContext<ApplicationDbContext>(options =>
{
options.UseSqlServer(dbConnectionString);
});

Answer 2

I added this to the Program.cs, now it works as expected. I don't know how come it worked when migrations were applied from exception page "Apply Migrations" button anyway.
// Add services to the container
if(builder.Enviroment.IsDevelopment())
{
builder.Configuration.AddUserSecrets<Program>();
}
..other code