If you are truggling on how to read a constant setting or any setting value into a custom class / or any POCO class from the appsettings, and passing them back to the application that use .netCore and support DependencyInjection, then you are looking at the right post.
I have been struggling on this and here is what I found out.
In your webApp project, go to the Startup.cs, go to the method ConfigureServices, and add the following code:
it can be:
var identitySettingsSection = Configuration.GetSection("AppIdentitySettingsConfig");
services.Configure<AppIdentitySettingsConfig>(identitySettingsSection);
or
services.Configure<AppIdentitySettingsConfig>(options => Configuration.GetSection("AppIdentitySettingsConfig").Bind(options));
Both are working same / fine. It will be looking like this:
public void ConfigureServices(IServiceCollection services)
{
services.Configure<AppIdentitySettingsConfig>(options => Configuration.GetSection("AppIdentitySettingsConfig").Bind(options));
Important note is make sure the parameter after GetSection is exactly the same as per your config file.
Next are how i set up for the other files.