public static void ValidateContentTypes(string[] contentTypes)
{
HashSet <string> valid = new HashSet <string>(StringComparer.CurrentCultureIgnoreCase);
// Microsoft's standard Output-derived content types are listed in OutputClassifierProvider's
// KnownContentTypes. However, other custom content types can be registered.
HashSet <string> knownOutputContentTypes = new HashSet <string>(
OutputClassifierProvider.GetOutputContentTypes(),
StringComparer.CurrentCultureIgnoreCase);
if (contentTypes != null)
{
foreach (string contentType in contentTypes
.Where(s => !string.IsNullOrEmpty(s))
.Select(s => s.Trim())
.Where(s => s.Length > 0))
{
// Only add types that are known to be valid (or add them all if there are no known types).
if (knownOutputContentTypes.Count == 0 || knownOutputContentTypes.Contains(contentType))
{
valid.Add(contentType);
}
}
}
if (valid.Count == 0)
{
throw new ArgumentException("You must specify one of the registered Output content types: " +
string.Join(", ", knownOutputContentTypes.OrderBy(s => s)));
}
}
public static HashSet <string> GetKnownOutputContentTypes()
{
// Microsoft's standard Output-derived content types are listed in OutputClassifierProvider's
// KnownContentTypes. However, other custom content types can be registered.
return(new HashSet <string>(
OutputClassifierProvider.GetOutputContentTypes(),
StringComparer.CurrentCultureIgnoreCase));
}