c# - Constructor with unknown argument -

i have started programming in c#, after spending of life in php.

in php this:

class user {     public __construct($userid)     {         // stuff     } }  class employee extends user {     public __construct($employeeid)     {         // userid connected $employeeid         $userid = hypothetical_get_user_id_func($employeeid);         parent::__construct($userid);     } } 

but, in c# don't seem have possibility, since seems must know $userid before enters first constructor.

public class user {     public user(int userid)     {         // stuff     } }  public class employee : user {     public employee(int employeeid) : base(***) // don't know value yet?     {         // find user id, , pass         // user class constructor.     } } 

is there way achieve trying here in c#?

basically passing value constructor of main object, in own body figures out value pass base class.

you can call static method in constructor. non standard though.

public class user {     public user(int userid)     {         // stuff     } }  public class employee : user {     public employee(int employeeid) : base(getuserid(employeeid))     {      }      public static int getuserid(int employeeid)     {                    return employeeid - 5;     } }