c# - ASP.NET Web API action routing doesn't not work -

i'm new web api, know 1 of difference between web api , mvc web api uses http method choose method invoke convention.

now added action parameter route, think there's went wrong knowledge, route doesn't work.

here's controller, main problem need map signin , signup method. (other restful methods work fine.)

public class userscontroller : apicontroller {     private model1container db = new model1container();      public ienumerable<user> getusers()     {         return db.userset;     }      [httppost]     public ihttpactionresult signin(string account, string password)     {         ...     }      [httppost]     public ihttpactionresult signup(user user)     {         ...     }      public ihttpactionresult getuser(int id)     {         ...     }      public ihttpactionresult putuser(int id, user user)     {         ...     }      public ihttpactionresult deleteuser(int id)     {         ...     }  } 

what i've tried add direct constraint on top 2 routes both methods,

config.routes.maphttproute(             name: "userssignin",             routetemplate: "api/users/signin",             defaults: new { controller = "users", action = "signin" }         );  config.routes.maphttproute(             name: "userssignup",             routetemplate: "api/users/signup",             defaults: new { controller = "users", action = "signup" }         );  config.routes.maphttproute(             name: "restfuluser",             routetemplate: "api/{controller}/{id}",             defaults: new { id = routeparameter.optional },             constraints: new { controller = "users" }         ); 

but turns out [post] "api/users/signup" , "api/users" map signup method, "api/users/signin" not succeed.

and here's how try api in postman

please point out did go wrong ..

if using attribute routing need differentiate between 2 routes. once using routes or nothing on controller itself. can't mix them convention-based routes.

review attribute routing in asp.net web api 2

[routeprefix("api/users")] public class userscontroller : apicontroller {     private model1container db = new model1container();      [httpget]     [route("")] //matches api/users     public ienumerable<user> getusers() {         return db.userset;     }      [httppost]     [route("signin")] //matches post api/users/signin     public ihttpactionresult signin(string account, string password) {         //...     }      [httppost]     [route("signup")] //matches post api/users/signup     public ihttpactionresult signup([frombody]user user) {         //...     }      [httpget]     [route("{id:int}")] //matches api/users/5     public ihttpactionresult getuser(int id) {         //...     }      [httpput]     [route("{id:int}")] //matches put api/users/5     public ihttpactionresult putuser(int id,[frombody]user user) {         //...     }      [httpdelete]     [route("{id:int}")] //matches delete api/users/5     public ihttpactionresult deleteuser(int id) {         //...     } }