Bind concrete object to IOptions interface in dotnet

Question

I want to register an IOptions implementation having an object with needed data . Having a IConfiguration with such data I can easily do this like this: (assuming IConfiguration has everything inside)

.ConfigureServices((context, services) =>
{
    services.AddOptions<SmtpConfig>().BindConfiguration(nameof(SmtpConfig));
})  

No how can I do the same with concrete data in place? Something like this:

services.AddOptions<SmtpConfig>().Bind(myData);

or

services.AddOptions<SmtpConfig>().Bind(new SmtpConfig() { ... });

Answer 1

To register an IOptions implementation using a concrete object, you can use the Configure method of the IServiceCollection interface, like this:

var myData = new SmtpConfig() { ... };
services.Configure<SmtpConfig>(options => options = myData);

This will register the SmtpConfig object as the implementation of the IOptions<SmtpConfig> interface, so that it can be injected into other classes via constructor injection.

Alternatively, if you want to register the SmtpConfig object as a singleton, you can use the AddSingleton method of the IServiceCollection interface, like this:

var myData = new SmtpConfig() { ... };
services.AddSingleton<SmtpConfig>(myData);

This will ensure that the same instance of the SmtpConfig object is used throughout the application.