Re: Casting question

A is the base class and B is the derived one. You create an array of base
objects and expect to cast them to derived ones. If you replace the classes
like this (which may have been your initial intention) everything is fine:

public class B { }
public class A : B { }

HTH,
Eddie

-----Original Message-----
From: Discussion relating to the specifics of the C# and Managed C++
languages [mailto:DOTNET-CX@xxxxxxxxxxxxxxxxxxx]On Behalf Of Rick Taylor
Sent: Monday, September 26, 2005 1:50 PM
To: DOTNET-CX@xxxxxxxxxxxxxxxxxxx
Subject: [DOTNET-CX] Casting question


I feel like this should be obvious, but, why is the cast in Test() invalid?
This compiles but throws an exception. (sorry about the format, comcast web
interface throwing things off)

public class A { }
public class B : A { }
public class Tester
{
public static A[] Gimme(int i)
{
A[] a = new A[i];
return a;
}

public static void Test()
{
B[] b = (B[])Gimme(5); // invalid cast
}
}

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