Access configuration object while configuring services-CodePudding

In a console application, rather than building the IConfiguration and IServiceProvider manually, I'm trying to use the Host.CreateDefaultBuilder() process:

IHost host = Host.CreateDefaultBuilder()
    .ConfigureServices((context, services) =>
    {
        services.AddSingleton<Whatever>();
    })
    .Build();

I can get the configuration object after building the host. But what I'm looking for is a way to get the config object while still in the ConfigureServices body, so that I can bind a config section to the service provider.

Something like:

AccountConfiguration accountConfig = new();
config.Bind("AccountConfiguration", accountConfig);
services.AddSingleton(accountConfig);
// or
services.Configure<AccountConfiguration>(config.GetSection("AccountConfiguration"));

Is there a way to access the config object while still configuring the services? Or a good way of adding an object to the service collection after the host has already been built?

CodePudding user response：

The first parameter of lambda passed to ConfigureServices is HostBuilderContext which exposes configuration property - IConfiguration Configuration:

IHost host = Host.CreateDefaultBuilder()
    .ConfigureServices((context, services) =>
    {
        IConfiguration config = context.Configuration;
        // use config
        services.AddSingleton<Whatever>();
    })
    .Build();