public HttpActionDescriptor SelectAction(HttpControllerContext controllerContext)
{
// Performance-sensitive
CandidateAction[] candidates = GetInitialCandidateList(controllerContext);
// Make sure the action parameter matches the route and query parameters. Overload resolution logic is applied when needed.
List <CandidateAction> actionsFoundByParams = FindActionUsingRouteAndQueryParameters(controllerContext, candidates);
List <CandidateAction> maximumOrderCandidates = RunOrderFilter(actionsFoundByParams);
List <CandidateAction> selectedCandidates = RunPrecedenceFilter(maximumOrderCandidates);
candidates = null;
actionsFoundByParams = null;
switch (selectedCandidates.Count)
{
case 0:
throw new HttpResponseException(CreateSelectionError(controllerContext));
case 1:
controllerContext.ElevateRouteData(selectedCandidates[0].ActionDescriptor);
return(selectedCandidates[0].ActionDescriptor);
default:
// Throws exception because multiple actions match the request
string ambiguityList = CreateAmbiguousMatchList(selectedCandidates);
throw Error.InvalidOperation(SRResources.ApiControllerActionSelector_AmbiguousMatch, ambiguityList);
}
}
