/// <summary>
/// Selects all elements of a `IEnumerable` property for validation.
/// </summary>
/// <typeparam name="T">The type of the current value.</typeparam>
/// <typeparam name="TItem">The type of an individual item in the `IEnumerable` 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`) or a `ParameterExpression`
/// to select all elements of the current value (e.g. `x => x`).
/// </para>
/// </param>
/// <param name="action">The action to perform for each item of the selected `IEnumerable` property.</param>
/// <returns>The unmodified validator context.</returns>
public static IValidatorContext <T> ForEach <T, TItem>(this IValidatorContext <T> validator,
Expression <Func <T, IEnumerable <TItem> > > selector, Action <IValidatorContext <TItem> > action)
{
ValidationInternals.ValidateNotNull(validator, nameof(validator));
ValidationInternals.ValidateNotNull(selector, nameof(selector));
ValidationInternals.ValidateNotNull(action, nameof(action));
var name = (selector.Body is ParameterExpression)
? null
: ValidationInternals.GetPropertyName(selector);
var value = selector.Compile().Invoke(validator.Value);
if (value is null)
{
return(validator);
}
int i = 0;
foreach (var item in value)
{
var context = (name is null)
? new ValidatorContext <TItem>(item, $"{ValidationInternals.FormatName(validator.Path, null)}[{i++}]")
: new ValidatorContext <TItem>(item, validator.Path, $"{name}[{i++}]");
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);
}