Multiple optional parameters web api attribute routing

Question

Hi guys i am new to attribute routing and not sure if this is even possible.

What i have is an attribute route which works fine like this

[HttpGet]
         


        

Answer 1

{flag:int=3?} is the problem. it is either optional {flag:int?} with the default value in the action or {flag:int=3}.

[HttpGet]
Route("GetIssuesByFlag/{flag:int=3}/{categoryId:int?}/{tagIds?}")]
public IEnumerable<IssueDto> GetIssuesByFlag(int flag , int? categoryId = null, int?[] tagIds = null)

You currently have 3 optional parameters. when you have just the 1 value routing table wont know which optional parameter you are referring to, hence the 404

Answer 2

Use a query string.

[HttpGet]
    [Route("GetIssuesByFlag/{flag:int=3?}")]
    public IEnumerable<IssueDto> GetIssuesByFlag(int flag, List<int> tagIds, int? categoryId = null)

Url: /getissuesbyflag/1?tagIds=2,5,6&categoryId=56

You really should use query strings for optional parameters and path parameters if they are required.