/// <summary>
/// Performs validations after projecting the current value to a new type.
/// </summary>
/// <typeparam name="T">The type of the current value.</typeparam>
/// <typeparam name="TNew">The type of the projected value.</typeparam>
/// <param name="validator">The current validator context.</param>
/// <param name="selector">The selector lambda.</param>
/// <param name="action">The action to perform with the projected value.</param>
/// <returns>The unmodified validator context.</returns>
public static IValidatorContext <T> Select <T, TNew>(this IValidatorContext <T> validator, Func <T, TNew> selector,
Action <IValidatorContext <TNew> > action)
{
ValidationInternals.ValidateNotNull(validator, nameof(validator));
ValidationInternals.ValidateNotNull(selector, nameof(selector));
ValidationInternals.ValidateNotNull(action, nameof(action));
var context = new ValidatorContext <TNew>(selector.Invoke(validator.Value), validator.Path, null);
action.Invoke(context);
return(validator);
}
/// <summary>
/// Selects a property for validation.
/// </summary>
/// <typeparam name="T">The type of the current value.</typeparam>
/// <typeparam name="TNext">The type of the selected property.</typeparam>
/// <param name="validator">The current validator context.</param>
/// <param name="selector">
/// The property selector expression.
/// <para>
/// The expression must be a `MemberExpression` (e.g. `x => x.Property`).
/// </para>
/// </param>
/// <param name="action">The action to perform for the selected property.</param>
/// <returns>The unmodified validator context.</returns>
public static IValidatorContext <T> For <T, TNext>(this IValidatorContext <T> validator,
Expression <Func <T, TNext> > selector, Action <IValidatorContext <TNext> > action)
{
ValidationInternals.ValidateNotNull(validator, nameof(validator));
ValidationInternals.ValidateNotNull(selector, nameof(selector));
ValidationInternals.ValidateNotNull(action, nameof(action));
var name = ValidationInternals.GetPropertyName(selector);
var value = selector.Compile().Invoke(validator.Value);
var context = new ValidatorContext <TNext>(value, validator.Path, name);
action.Invoke(context);
return(validator);
}