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Set settings

IConfigurator<> is the main service to write settings.
Example: Inject IConfigurator<> into a command handler:
public class EditEmailSettingsCommandHandler : ICommandHandler<EditEmailSettingsCommand>
private readonly IConfigurator<SmtpEmailSettings> _configurator;
public EditEmailSettingsCommandHandler(IConfigurator<SmtpEmailSettings> configurator)
=> _configurator = configurator;
public Task HandleAsync(EditEmailSettingsCommand command)
// Configure settings by command data.
_configurator.Configure(settings =>
settings.Host = command.Host;
settings.Port = command.Port;
Simple settings modification mechanism out of the box is one of the most distinguishing features from the Microsoft Options pattern.