This will solve your problem:
http://en.wikipedia.org/wiki/Composition_over_inheritance
--
Krzysztof Kozmic
On Saturday, 8 December 2012 at 7:24 AM, Pingmustard wrote:
> I'm not sure if DynamicProxy can solve the design dilemma I have, but since
> the framework looked promising, I thought I might ask the question..
>
> I'm designing an object hierarchy. To keep the idea simple, say I have a Pet
> class, and a Dog sub-class (eventually, I'd have MANY sub-classes of Pet
> statically defined). Pet provides a default virtual talk() method, but I'd
> like to somehow be able to change/swap the base talk() if necessary (maybe I
> don't like the default "Oops" string). Here's the sample classes:
>
> public class Pet
> {
> public string Name { get; set; } // interceptors will not
> capture this guy b/c it's missing virtual (aka overridable)
> public virtual int Age { get; set; }
> public virtual bool Deceased { get; set; }
>
> public virtual string talk()
> {
> return "Oops";
> }
> public override string ToString()
> {
> return string.Format("Name: {0}, Age: {1}, Deceased: {2}",
> Name, Age, Deceased);
> }
> }
>
> public class Dog : Pet
> {
> public override string talk()
> {
> base.talk();
> return "Woof!";
> }
> }
>
>
> One possible solution to this dilemma is I could have the Pet.talk have a
> dedicated side routine that could be intercepted, and make it a development
> guideline to not directly call this routine ("talk_ex"):
>
> public virtual string talk()
> {
> return talk_ex();
> }
>
>
> public virtual string talk_ex()
> {
> return "Oops";
> }
>
> However, this isn't optimal since all base class I design would have to
> remember and manually code in this style (let alone expose the "ex" routines
> to sub-classes unnecessarily). I'm hoping DP might have a better way to
> solve this problem? I'm designing this from scratch, so any suggestion is
> welcome!
>
> Thanks!
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