c#.net中类的覆写(OverRide)

c#.net中类的覆写(OverRide)

public class MyBase
... {
public virtual string Meth1()
... {
return " MyBase-Meth1 " ;
}
public virtual string Meth2()
... {
return " MyBase-Meth2 " ;
}
public virtual string Meth3()
... {
return " MyBase-Meth3 " ;
}
}

class MyDerived:MyBase
... {
// OverridesthevirtualmethodMeth1usingtheoverridekeyword:
public override string Meth1()
... {
return " MyDerived-Meth1 " ;
}
// ExplicitlyhidethevirtualmethodMeth2usingthenew
// keyword:
public new string Meth2()
... {
return " MyDerived-Meth2 " ;
}
// Becausenokeywordisspecifiedinthefollowingdeclaration
// awarningwillbeissuedtoalerttheprogrammerthat
// themethodhidestheinheritedmemberMyBase.Meth3():
public string Meth3()
... {
return " MyDerived-Meth3 " ;
}

public static void Main()
... {
MyDerivedmD = new MyDerived();
MyBasemB = (MyBase)mD;

System.Console.WriteLine(mB.Meth1());
System.Console.WriteLine(mB.Meth2());
System.Console.WriteLine(mB.Meth3());
}
}