c# - Controller Code to Loop Through Roles and Get First Letter of Role MVC 6 -

here userviewmodel:

public class userviewmodel {     public string userid { get; set; }     public string email { get; set; }     public string roles { get; set; } } 

the line, "roles=roleprefixes(u.id)" red. have tried call darn function. in controller, how call roleprefixes(string id) function? "function" because don't know say.

  private list<userviewmodel> getusers()     {        var usermanager =  _serviceprovider.getrequiredservice<usermanager<applicationuser>>();         var rolemanager = _serviceprovider.getrequiredservice<rolemanager<identityrole>>();         var allroles = rolemanager.roles.tolist();         //var user = usermanager.findbyidasync(userid);         //var usersroles = usermanager.getrolesasync(user);          return context.users.select(u => new userviewmodel         {             email = u.email,             userid = u.id,             // works role ids not names::: roles = string.join("/", u.roles.select(r => r.roleid.first()))              roles = roleprefixes(u.id) //this underlined in red.          }).tolist();      }       public async task<string> roleprefixes(string id)     {         var usermanager = _serviceprovider.getrequiredservice<usermanager<applicationuser>>();         //var rolemanager = _serviceprovider.getrequiredservice<rolemanager<identityrole>>();         //var allroles = rolemanager.roles.tolist();         var user = await usermanager.findbyidasync(id);         var usersroles = await usermanager.getrolesasync(user);          string strprefixes = "";         foreach (var item in usersroles)         {             strprefixes += item + "/";          }          return strprefixes;      } 

project role name, select first character string, , join them together.

return context.users.select(u => new userviewmodel {     email = u.email,     userid = u.id,      roles = string.join("/", context.roles.where(r => r.users.any(u2 => u2.userid == u.id)).select(r => r.name.first()))  }).tolist();