How to wait for asp.net core configuration to be done for backgroundworkers? - asp.net-core

Question

I created a blazor server application which also makes use of BackgroundService / IHostedService - Unfortunately those services Start+Execute before the Configure method within Startup is called. Therefore migrations/database creation are not done before they are used in the services.
I already found a workaround for this, but i am wondering if there is a proper way to solve this.
My workaround for those who have the same issue is this:
public class ApplicationStateTransmitter
{
private readonly TaskCompletionSource _configurationDone;
public ApplicationStateTransmitter()
{
_configurationDone = new TaskCompletionSource(null);
}
public Task ConfigurationDone => _configurationDone.Task;
public void NotifyConfigurationDone() => _configurationDone.SetResult();
}
Startup.ConfigureServices:
services.AddSingleton<ApplicationStateTransmitter>();
Startup.Configure:
using (var serviceScope = serviceScopeFactory.CreateScope())
{
using (var context = serviceScope.ServiceProvider.GetRequiredService<ApplicationDbContext>())
{
if (!context.Database.CanConnect())
{
logger.LogInformation("Database does not exist yet - Creating database through migrations");
context.Database.Migrate();
}
else
{
if (context.Database.GetPendingMigrations().Any())
{
logger.LogInformation("Applying database migration");
context.Database.Migrate();
logger.LogInformation("Applying database migration done");
}
else
{
logger.LogDebug("No pending migrations found");
}
}
}
}
applicationStateTransmitter.NotifyConfigurationDone();
logger.LogInformation("Configuration done");
Inject instance and await like this
await _applicationStateTransmitter.ConfigurationDone;