关于用多态访问接口方法的疑惑
       static void Main(string[] args)
        {
            DerivedClass sww= new DerivedClass();
            BaseClass sd = sww;
          //  Console.Write(sd.ToString());
            sd.DoWork();
         //   sww.DoWork();
          //  Iwangge shenme = sww;
        //    shenme.DoWork();
            
        }
    }
    public class BaseClass :Iwangge
    {
        public  void DoWork() { }
        public virtual int WorkProperty
        {
            get { return 0; }
        }
    }
    public class DerivedClass : BaseClass,Iwangge
    {
        public   void DoWork() { }
        public static void sdsss()
        { }
        public override int WorkProperty
        {
            get { return 0; }
        }}
        public interface Iwangge
        {
            void DoWork();
        }
     
}
//sd.DoWork();访问的为什么是基类中的dowork方法，他不是派生类的引用吗？