How to pass a parameter of a derived class

[Steve Teeples]

I have a base class 'A' that contains most of the functionality that
I want. However, it is necessary to derive classes from the base for some
unique behavior I require. I want to call a routine that will accept a
reference of any derived class of A. I don't know in C# how this is done.
Can someone help me? What would be the parameter for the DoSomething(ref
xxx) below?

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

void DoSomething(ref xxx){}
------
Steve

[Jon Skeet [C# MVP]]

Steve Teeples <St**********@discussions.microsoft.com> wrote:

I have a base class 'A' that contains most of the functionality that
I want. However, it is necessary to derive classes from the base for some
unique behavior I require. I want to call a routine that will accept a
reference of any derived class of A. I don't know in C# how this is done.
Can someone help me? What would be the parameter for the DoSomething(ref
xxx) below?

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

void DoSomething(ref xxx){}

It sounds like you probably just want to make A abstract, and then just
declare DoSomething to accept an A. You probably *don't* want to use
"ref" though. Read the following to make sure you understand
pass-by-reference properly:

http://www.pobox.com/~skeet/csharp/parameters.html

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Vadim Berezniker]

Steve Teeples wrote:

I have a base class 'A' that contains most of the functionality that
I want. However, it is necessary to derive classes from the base for some
unique behavior I require. I want to call a routine that will accept a
reference of any derived class of A. I don't know in C# how this is done.
Can someone help me? What would be the parameter for the DoSomething(ref
xxx) below?

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

void DoSomething(ref xxx){}
------
Steve

void DoSomething(A xxx) {}
will do

[Steve Teeples]

The input from both of you was very helpful. My issue was resolved - nicely.
Thanks.

"Steve Teeples" wrote:

I have a base class 'A' that contains most of the functionality that
I want. However, it is necessary to derive classes from the base for some
unique behavior I require. I want to call a routine that will accept a
reference of any derived class of A. I don't know in C# how this is done.
Can someone help me? What would be the parameter for the DoSomething(ref
xxx) below?

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

void DoSomething(ref xxx){}
------
Steve