c# - There is override and hidden method exist in derived class. Why? -

there code sample:

public class  {     public virtual void m()     {         console.writeline("a");      } }  public class b : {     public override void m()     {         console.writeline("b");     }  }  public class c : b {     public new virtual void m()     {         console.writeline("c");     } }  public class d : c {     public override void m()     {         console.writeline("d");     } }    internal class program {     static void main()     {         c c = new c();         foreach (var method in typeof (c).getmethods().where(_ => _.name == "m"))         {             method.invoke(c, new object[0]);         }         c = new d();         foreach (var method in typeof(d).getmethods().where(_ => _.name == "m"))         {             method.invoke(c, new object[0]);         }     } } 

i got overridden method exists in hierarchy in case hidden next ierarchy level class. can explain me why? or give me link can find out? thanks.

that's idea of hiding - still exists.

if c# wouldn't allow kind of hiding, they'd have disallow using method names if exist in base class.

the base class method still exist; otherwise base class no longer function properly. can't access directly class instance derives it:

c c = new c(); c.m(); // returns c ((b)c).m(); // returns b