How to get the list of IOptions available from DI in c# Core?

Question

Following this post: https://blog.bredvid.no/validating-configuration-in-asp-net-core-e9825bd15f10

I m now available to validate the Settings when a service need it.

Answer 1

You can get a list of configured option types by iterating the IServiceCollection instance:

var configuredOptionTypes =
    from descriptor in services
    let serviceType = descriptor.ServiceType
    where serviceType.IsGenericType
    where serviceType.GetGenericTypeDefinition() == typeof(IConfigureNamedOptions<>)
    let optionType = serviceType.GetGenericArguments()[0]
    select optionType;