❔ FluentValidation on startup

public static class OptionsBuilderFluentValidationExtensions
{
    public static OptionsBuilder<TOptions> ValidateFluentValidation<TOptions>(
        this OptionsBuilder<TOptions> optionsBuilder) where TOptions : class
    {
        optionsBuilder.Services.AddSingleton<IValidateOptions<TOptions>>(
            provider => new FluentValidationOptions<TOptions>(optionsBuilder.Name, provider));
        return optionsBuilder;
    }
}

public class FluentValidationOptions<TOptions> : IValidateOptions<TOptions> where TOptions : class
{
    private readonly IServiceProvider _serviceProvider;
    private readonly string? _name;

    public FluentValidationOptions(string? name, IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
        _name = name;
    }

    public ValidateOptionsResult Validate(string? name, TOptions options)
    {
        if (_name != null && _name != name)
        {
            return ValidateOptionsResult.Skip;
        }

        ArgumentNullException.ThrowIfNull(options);

        using var scope = _serviceProvider.CreateScope();
        var validator = scope.ServiceProvider.GetRequiredService<IValidator<TOptions>>();
        var results = validator.Validate(options);
        if (results.IsValid)
        {
            return ValidateOptionsResult.Success;
        }

        var typeName = options.GetType().Name;
        var errors = results.Errors
            .Select(result => $"Fluent validation failed for '{typeName}.{result.PropertyName}' with the error: '{result.ErrorMessage}'.")
            .ToList();

        return ValidateOptionsResult.Fail(errors);
    }
}

public static class OptionsBuilderFluentValidationExtensions
{
    public static OptionsBuilder<TOptions> ValidateFluentValidation<TOptions>(
        this OptionsBuilder<TOptions> optionsBuilder) where TOptions : class
    {
        optionsBuilder.Services.AddSingleton<IValidateOptions<TOptions>>(
            provider => new FluentValidationOptions<TOptions>(optionsBuilder.Name, provider));
        return optionsBuilder;
    }
}

public class FluentValidationOptions<TOptions> : IValidateOptions<TOptions> where TOptions : class
{
    private readonly IServiceProvider _serviceProvider;
    private readonly string? _name;

    public FluentValidationOptions(string? name, IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
        _name = name;
    }

    public ValidateOptionsResult Validate(string? name, TOptions options)
    {
        if (_name != null && _name != name)
        {
            return ValidateOptionsResult.Skip;
        }

        ArgumentNullException.ThrowIfNull(options);

        using var scope = _serviceProvider.CreateScope();
        var validator = scope.ServiceProvider.GetRequiredService<IValidator<TOptions>>();
        var results = validator.Validate(options);
        if (results.IsValid)
        {
            return ValidateOptionsResult.Success;
        }

        var typeName = options.GetType().Name;
        var errors = results.Errors
            .Select(result => $"Fluent validation failed for '{typeName}.{result.PropertyName}' with the error: '{result.ErrorMessage}'.")
            .ToList();

        return ValidateOptionsResult.Fail(errors);
    }
}