private static RouteValidationResult EnsureNoMoreThanOneCatchAllSegment(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var catchAll = segments.OfType <CatchAllParameterSegment>().ToList();
return(catchAll.Count > 1
? RouteValidationResult.Failure(string.Format("A route cannot have more than one catch-all parameter. Catch all parameters: {0}", string.Join(", ", catchAll.Select(x => "'" + x.ParameterName + "'").ToArray())))
: RouteValidationResult.Successful());
}
private static RouteValidationResult EnsureCatchAllOnlyAppearAtEnd(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var catchAll = segments.OfType <CatchAllParameterSegment>().ToList();
return(catchAll.Count == 1 && segments.Last() != catchAll.Single()
? RouteValidationResult.Failure(string.Format("Catch-all parameters may only appear at the end of a route. Catch all parameter: '{0}'", catchAll.Single().ParameterName))
: RouteValidationResult.Successful());
}
private RouteValidationResult EnsureNoUnrecognizableSegments(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var unrecognized = segments.Where(x => SupportedSegmentTypes.Contains(x.GetType()) == false).ToList();
return(unrecognized.Count > 0
? RouteValidationResult.Failure(string.Format("Unrecognized segment types were found. If using a custom segment type, please replace the IRouteValidator to enforce your own route validation rules. Unrecognized types: {0}", string.Join(", ", unrecognized.Select(x => "'" + x.GetType().Name + "'").ToArray())))
: RouteValidationResult.Successful());
}
private static RouteValidationResult EnsureParameterNamesAreUnique(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var parameterSegments = segments.OfType <ParameterSegment>().Select(x => x.ParameterName);
var catchAllSegments = segments.OfType <CatchAllParameterSegment>().Select(x => x.ParameterName);
var parameterNames = parameterSegments.Concat(catchAllSegments).Select(x => x.ToLowerInvariant());
var duplicateNames = parameterNames.GroupBy(x => x).Where(g => g.Count() > 1).Select(x => x.Key).ToList();
return(duplicateNames.Count > 0
? RouteValidationResult.Failure(string.Format("The same parameter name cannot be used twice within a route. The following parameters appeared more than once: {0}", string.Join(", ", duplicateNames.Select(x => "'" + x + "'").ToArray())))
: RouteValidationResult.Successful());
}