asp.net mvc - MVC 5 Custom ActionFilter not working -

i'm trying implement basic authentication service using question template.

for reason action filter never applied controllers , have no idea why.

my controller:

[basicauthenticationmanager("username", "password")] public class datacontroller : apicontroller {     private dataentities db = new dataentities();      // get: api/data      //[basicauthenticationmanager]     public ihttpactionresult getvwdata()     {         return json(db.vwdata);     } } 

my filter:

public class basicauthenticationmanager : actionfilterattribute {     protected string username { get; set; }     protected string password { get; set; }      public basicauthenticationmanager(string username, string password)     {         this.username = username;         this.password = password;     }     public override void onactionexecuting(actionexecutingcontext filtercontext)     {          var req = filtercontext.httpcontext.request;         var auth = req.headers["authorization"];          if (!string.isnullorempty(auth))         {             var credentials = asciiencoding.ascii.getstring(convert.frombase64string(auth.substring(6))).split(':');             var user = new { name = credentials[0], pass = credentials[1] };             if (user.name == username && user.pass == password) return;         }          filtercontext.result = new httpunauthorizedresult();     } } 

i don't error messaage , filter recogniced code autocompletion.

inherit system.web.http.authorizeattribute instead of actionfilterattribute. can override isauthorized method.

protected override bool isauthorized(system.web.http.controllers.httpactioncontext actioncontext) {     //auth logic     //return whether user authorized or not. }