Type of base pointer
- From: "dotNiemand" <dotNiemand@xxxxxxxxx>
- Date: 23 Oct 2006 07:40:15 -0700
Take a look on this code:
using System;
using System.Collections.Generic;
using System.Text;
namespace BasePtr
{
class Program
{
class A
{
public virtual void Test()
{
Console.WriteLine("Method of base class");
}
}
class B:A
{
public override void Test()
{
Console.WriteLine("This is a real virtual method!");
}
public void OldTest()
{
base.Test();
}
public void ICanntUnderstand()
{
Console.WriteLine(base.GetType().ToString()); // WHY
IS THE OUTPUT "B?! base class for B is A not A"
}
}
static void Main(string[] args)
{
A a = new A(); // new A instance
a.Test(); // "Method of base class"
B b = new B(); // new B instance
b.Test(); // "This is a real virtual method!"
a = b;
a.Test(); // "This is a real virtual method!"
b.OldTest(); // "Method of base class"
b.ICanntUnderstand(); // WHY IS THE OUTPUT "B?! base class
for B is A not A"
Console.Read();
}
}
}
This code returns:
Method of base class
This is a real virtual method!
This is a real virtual method!
Method of base class
BasePtr.Program+B
I have a virtual function called Test() in class A. Also i have class B
- it's derived from A and has overrided method Test() as well.
I can easly access method A.Test() from class B - as written in
function B.OldTest().
As well base object doesn't have method OldTest(). You can see it in
this error description:
Error 1 'BasePtr.Program.A' does not contain a definition for
'OldTest' C:\Documents and Settings\Vitaliy\My Documents\Visual Studio
2005\Projects\BasePtr\BasePtr\Program.cs 27 22 BasePtr
base class for B is A and error above shows that base is
BasePtr.Program.A.
But code "base.GetType()" in any method of class B returns value
BasePtr.Program.B.
WHY?!
.
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