Options Configuration with dynamic (runtime) values

Question

I have a MySettings class which I want to configure as Options to make it available via the dependency injection.

Currently I do (in an service builder extension method):

services.Configure<MySettings>(configuration.GetSection(MySettings.CustomSectionName));

My problem is that one part of the settings comes from the appsettings and other values are only known at runtime (startup).

So I try to find out how to configure the settings with adding the runtime provided values. I tried to add the values to the configuration

configuration["SectionName:ValueX"] = "my runtime value";

That did not work and ValueX is always null (when the options are injected in the controller).

Any suggestions for me?

Answer 1

You can use IPostConfigureOptions< TOptions > interface to achieve what you want

services.PostConfigure<CustomOptions>(customOptions =>
{
    customOptions.Option1 = "post_configured_option1_value";
});

Reference: https://learn.microsoft.com/en-us/dotnet/core/extensions/options#options-post-configuration