c# - Is it possible to provide a decendent class as a formal parameter in an overriden function and still compile -

what best way provide mechanism in base class can have function class parameter , decendant class can override function parameter decendant of base classes parameter. confused, let me construct implement below:

base class

public class basereportcontroller {     private actionresult internalrenderreport(basereportmodel model)     {         reportexecution execution = this.getreportexecution(model);         execution.addrequiredparameter("databasename", atargetdatabase);         execution.addrequiredparameter("databaseservername", atargetserver);         //send execution ssrs wrappers return report payload     }      public virtual reportexecution getreportexecution(basereportmodel model)     {         return null;     } } 

extended class

public class extendedreportcontroller:basereportcontroller {     public override reportexecution getreportexecution(extendedfrombasereportmodel model)     {         reportexecution exec = new reportexecution();         exec.addoptionalparameter("someid1", model.someid1);         exec.addoptionalparameter("someid2", model.someid2);         return exec;     } } 

is there anonymous parameter allow me define extendedfrombasereportmodel formal parameter in overridden method , still compile?

use base class , cast derived type inside method.

public class extendedreportcontroller:basereportcontroller {     public override reportexecution getreportexecution(basereportmodel model)     {         var castedmodel = (extendedfrombasereportmodel) model;         reportexecution exec = new reportexecution();         exec.addoptionalparameter("someid1", castedmodel.someid1);         exec.addoptionalparameter("someid2", castedmodel.someid2);         return exec;     } }