Get the current user within an ApiController action without passing the userID as a parameter

Question

How do we get the current user  within an secure ApiController action  without passing the userName or userId as a parameter    We assume that this is available  because we are within a secure action  Being in a secure action means that the user has already authenticated and the request has her bearer token  Given that WebApi has authorized the user  there may be a built in way to access the userId  without having to pass it as an action parameter

User · Answer

string userName  string userId  if  HttpContext Current    null  amp  amp  HttpContext Current User    null           amp  amp  HttpContext Current User Identity Name    null        userName   HttpContext Current User Identity Name      userId   HttpContext Current User Identity GetUserId        Or based on Darrel Miller s comment  maybe use this to retrieve the HttpContext first      get httpContext object httpContext  actionContext Request Properties TryGetValue  MS HttpContext   out httpContext         See also    How to access HTTPContext from within your Web API action

User · Answer

None of the suggestions above worked for me  The following did   HttpContext Current Request LogonUserIdentity Name   I guess there s a wide variety of scenarios and this one worked for me  My scenario involved an AngularJS frontend and a Web API 2 backend application  both running under IIS  I had to set both applications to run exclusively under Windows Authentication   No need to pass any user information  The browser and IIS exchange the logged on user credentials and the Web API has access to the user credentials on demand  from IIS I presume

User · Answer

In WebApi 2 you can use RequestContext Principal from within a method on ApiController

User · Answer

In  Net Core use User Identity Name to get the Name claim of the user

User · Answer

You can also access the principal using the User property on ApiController   So the following two statements are basically the same   string id  id   User Identity GetUserId    id   RequestContext Principal Identity GetUserId

User · Answer

If you are using Asp Identity UseManager  it automatically sets the value of     RequestContext Principal Identity GetUserId     based on IdentityUser you use in creating the IdentityDbContext   If ever you are implementing a custom user table and owin token bearer authentication  kindly check on my answer   How to get user context during Web Api calls   Hope it still helps

User · Answer

Hint lies in Webapi2 auto generated account controller  Have this property with getter defined as  public string UserIdentity                       get                               var user   UserManager FindByName User Identity Name                   return user   user Email                           and in order to get UserManager - In WebApi2 -do as Romans  read as AccountController  do  public ApplicationUserManager UserManager                       get   return HttpContext Current GetOwinContext   GetUserManager lt ApplicationUserManager gt                   This should be compatible in IIS and self host mode

User · Answer

Karan Bhandari s answer is good  but the AccountController added in a project is very likely a Mvc Controller   To convert his answer for use in an ApiController change HttpContext Current GetOwinContext   to Request GetOwinContext   and make sure you have added the following 2 using statements   using Microsoft AspNet Identity  using Microsoft AspNet Identity Owin

[c#] Get the current user, within an ApiController action, without passing the userID as a parameter

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