public static bool ValidateAll(this IValidatable item)
{
if (!item.ValidateObject())
{
return(false);
}
const BindingFlags flags = BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.Public;
var type = item.GetType();
var props = type.GetProperties(flags).Select(x => x.GetValue(item));
var fields = type.GetFields(flags).Select(x => x.GetValue(item));
return(props
.Concat(fields)
.OfType <IValidatable>()
.Select(x => x.ValidateAll())
.All(x => x));
}