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struct as an interface and use in an abstract class

Posted on 2010-08-30
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Last Modified: 2012-05-10
I am struggling with how to fefine a struct to be used for data passing into a class.

I would like to create an interface that defines a struct.
Ultimately this struct would be used in a derived class.
I have created an abstract class defined by my interface but I dont knwo how to use the struct.

Is it possible to do what I ask?
I have created a small exmaple of how I see it working.

Am I on the right track here?

Thanks in advance


namespace abc
{
    public interface iParms
    {
        string p1
        {
            get;
            set;
        }
        string p1
        {
            get;
            set;
        }
     }

   public interface iabc
    {

        iParms ParmList
        {
            get;
            set;
        }

	Code method 1,2,3
	.
	.
	.
    }



    public abstract class cabc : iabc
    {
        public struct cParms : iParms;


	Code method 1,2,3
	.
	.
	.
    }

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Question by:CSUGDEN
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3 Comments
 
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Expert Comment

by:ricovox
ID: 33560675
Hi,

To quickly answer your question: YES to the first part, NO to the second

MS Documentation says:
There is no inheritance for structs as there is for classes. A struct  cannot inherit from another struct or class, and it cannot be the base  of a class. Structs, however, inherit from the base class Object. A struct can implement interfaces, and it does that exactly as classes do.

So you certainly can have an interface as you have shown, and you can use a struct to implement that interface if you want to.
From what I can see, you code would work fine except the last part (in the abstract class)

    public abstract class cabc : iabc
    {
        public struct cParms : iParms; <-- this is NOT valid.


You can do some different things here:
You can simply have a property that you can set to whatever you want (as long as it is an iParms)
Like this:

    public abstract class cabc : iabc
    {
        public iParms ParamList {get;set;}
        //.....

Or maybe you meant that you wanted to define a new struct that is an iParms inside the abstract class. That is possible too:

    public abstract class cabc : iabc
    {
        public iParms ParamList {get;set;}  <--note: you NEED this for it to be an "iabc".
        //.....
        public struct CoolParms : iParm  
        {
                  private string _p1, _p2;
        {
            get {return _p1;}
            set {_p1 = value;}
        }
        string p2
        {
            get {...;}
            set {...;}
        }

       

Does that answer your question, or did I misunderstand?
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LVL 4

Accepted Solution

by:
ricovox earned 125 total points
ID: 33560707
Note that in either example I posted above, you can also define other structs elsewhere that also implement iParm, and you can set the "ParmList" property of a non-abstract descendant of cabc to ANY struct OR class that implements iParm. I think that is what you are looking for.
0
 

Author Closing Comment

by:CSUGDEN
ID: 33560871
Great answer. There is so much info on this topic but far few good examples.
0

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