// ASP.NET Core calls this validate incoming parameters
public IEnumerable <ValidationResult> Validate(ValidationContext validationContext)
{
var processor = new SortOptionsProcessor <T, TEntity>(OrderBy);
var validTerms = processor.GetValidTerms().Select(x => x.Name);
var invalidTerms = processor.GetAllTerms().Select(x => x.Name)
.Except(validTerms, StringComparer.OrdinalIgnoreCase);
foreach (var term in invalidTerms)
{
yield return(new ValidationResult(
$"Invalid sort term '{term}'.",
new[] { nameof(OrderBy) }));
}
}
// The service code will call this to apply these sort options to a database query
public IQueryable <TEntity> Apply(IQueryable <TEntity> query)
{
var processor = new SortOptionsProcessor <T, TEntity>(OrderBy);
return(processor.Apply(query));
}