ioptions.cs

/// <summary>
    /// Registers <see cref="IOptions{TOptions}"/> and <typeparamref name="TOptions"/> to the services container.
    /// Also runs data annotation validation on application startup.
    /// </summary>
    /// <typeparam name="TOptions">The type of the options.</typeparam>
    /// <param name="services">The services collection.</param>
    /// <param name="configuration">The configuration.</param>
    /// <returns>The same services collection.</returns>
    public static IServiceCollection ConfigureAndValidateSingleton<TOptions>(
        this IServiceCollection services,
        IConfiguration configuration)
        where TOptions : class, new()
    {
        ArgumentNullException.ThrowIfNull(services);
        ArgumentNullException.ThrowIfNull(configuration);

        services
            .AddOptions<TOptions>()
            .Bind(configuration)
            .ValidateDataAnnotations()
            .ValidateOnStart();
        return services.AddSingleton(x => x.GetRequiredService<IOptions<TOptions>>().Value);
    }