C# Collection Question

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Hi folks

Thank you for the feedback. The solutions assume that I know number of objects in advance.

A simple analogy would be to assume a GUI (Window form) with a drop down where you can select a school district from many.

Once you select a school district (the A object), you drill down to number of schools in this district which can vary (B objects). For each B object there are classrooms objects (C objects). Each C object has array of Female students, array of male students, a single door, a single blackboard ... and so forth. These are the attributs of the C objects.

Thanks
Mike

Posted 11-Apr-11 4:14am

Member 7818892

Updated 11-Apr-11 16:49pm

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Kim Togo 11-Apr-11 10:22am

Can you give some code example on how far you are now ?

BobJanova 11-Apr-11 10:42am

Please explain 'key data' a bit more. What is C?

Wayne's answer looks good from the information we have now. A and B certainly will contain a List of B and C respectively.

Ed: Depending on how you're planning on referencing B and C instances, you may want a Dictionary<keyType, B/C> instead

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Nish Nishant · Answer 1 · 2011-04-11T04:49:00

Not sure what's confusing here. For things like this just adopt the simplest possible approach (which will nearly always be the best one):

C#

namespace ABC
{
    class Program
    {
        static void Main()
        {
            C c1 = new C();
            C c2 = new C();
            C c3 = new C();
//...
            B b1 = new B();
            b1.Add(c1);
            b1.Add(c2);
//...
            B b2 = new B();
            b2.Add(c3);
//...
            A a = new A();
            a.Add(b1);
            a.Add(b2);
        }
    }
//...

    class C
    {
        public DateTime CreateDate { get; set; }
//...
        public int Id { get; set; }
    }
//...

    class B : Collection<C>
    {
    }
//...

    class A : Collection<B>
    {
    }
}

Wayne Gaylard · Answer 2 · 2011-04-11T04:31:00

Are you looking at something like this

C#

class a
   {
       public List<b> bObjects { get; set; }
   }
   class b
   {
       public List<c> cObjects { get; set; }
   }
   class c
   {
       //members here
   }

Each object of class a will have a List of class b objects, which would in turn have a list o class c objects.

#realJSOP · Answer 3 · 2011-04-11T04:47:00

I'd do something like this (caution - untested code):

C#

public class a : List<b>
{
    // Adds or inserts a c item and if specified creates a b item for the c item 
    // if the index is out of range
    public bool AddInsertObject(int index, c cItem, bool createB)
    {
        bool success = false;
        if (index >= 0 && (index < this.Count)
        {
            this[index].Add(cItem);
            success = true;
        }
        else
        {
            if (createB)
            {
                b bList = new b();
                bList.Add(cItem);
                this.Add(bList);
            }            
        }
        return success;
    }
}

public class b : List<c>
{
}

public class c
{
    // properties and methods for this object
}

Useage:

C#

a.AddInsertObject(int index, new c(){init properties});

C# Collection Question

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