Create a public collection in a userControl

Posted on 2000-03-16
Last Modified: 2010-05-02
I am trying to create an array of a object (from a class) or a user defuned type in a UserControl.  I need to be able to access the properties of the class inside the UserControl.
I have created a collection that works fine inside the UserControl, But I can't Get to it from outside.  VB won't let met declare the Collect as Public, or make it a property of the control.

Was there something I need to do or any work around?
Question by:GeorgeVT
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Expert Comment

ID: 2625552
A little more infor please?
LVL 15

Expert Comment

ID: 2625599
The simplest solution is to expose properties of your class via UserControl; e.g. if class is SubItem, and property is BackColor, your users will not use:
 Dim objX As SubItem
 MsgBox objX.BackColor

but this:
 MsgBox myControl.SubItemBackColor ' no extra objects
LVL 15

Expert Comment

ID: 2625664
Or with 2D array, instead of
  Dim objX As Cell
  objX(6, 7).BackColor = vbRed

  myControl.Row = 6
  myControl.Col = 7
  myControl.CellBackColor = vbRed
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Expert Comment

ID: 2625719
Welll.. some extra info might be helpfull... but I'l give it a try.

I guess you have an internal Collection of objects in you UserControl. But, did you declare the classmodule, which is being held in that collection as PublicNotCreateable or Public (Instancing Property of classmodule) ?

Second, as ameba mentioned, you should implement a property or a method on the usercontrol in order to get to the internal collection object from the containing form. Something like:
In UserControl:
Public Property Get MyCollection() as Collection
   Set MyCollection = m_InternalCollection
End Property
On the Form you can then:

Dim oCollectionInForm as Collection

Set oCollectionInForm = MyControl.MyCollection

If you are doing all of this, it should work. Some extra info will definitely be needed to figure out what else is going wrong otherwise....

Hope this can help


Expert Comment

ID: 2627121

You need to create your own Class as a wrapper for the Collection Object.

If you have VB5+ you canuse the Class Wizard to do all the hardwork, otherwise

you need to create a class with all the properties of the Collection


Add, Remove, Item, Count

Then make that class MultiUse, or PublicNonCreateAble(Most Likely)

IF you use the class wizard , you even get the For Each .. NExt functionality

Hope this helps



Author Comment

ID: 2627890
I already did that, Gordonp. You did not understand my problem.

Here is the more information:

I am doing a UserControl for a Doctor's Office. They use Carousel kind of shelf to keep patient's records. Each carousel has a number of shelves, and each shelf has a number of slots, and in each slot hold a patient's records.

So I have a class for slots with a couple of properties, SlotID, ShelfNumber it is in, and PatientName.
I developed a collection of slots with the patient Name as the key.   Now I have a user control for the carousel which also have a MSComm to control the turning, but that part works fime.  i also have a database that the control save/retrieve infor from, it also works fine.
So Noe I would like to do is, in My VB form, drop the UserControl to the form, and be able to use something like;  
1. When I get a new Patient, I need to assign a empty slot to the patient, to do something like:
MyCarousel.Slots(1234).Patient = "Bob Jones"

2. When a patient comes in, I need to retieve the slot number so I can turn it to the right shelf for the clerk to get to the record. something like
ShelfNumber = MyControl.Slots("Sandy Wonner").ShelfNumber

Thanks for your help

Expert Comment

ID: 2628418
This is my 2 cents, George.

Fisrt add a new method to your collection, called changeName which would change the patientname of the slot (if you need help on that, let me know, I will try that)
Add a new method to your userControl, call it PatientName , with one requred parameter of SlotID(assume that is the key to your collection), and Optional Parameter of PatientName (declare it as Variant)
In the new method:

Do something like:
 Dim myslot as Slot
If IsMissing(PatientNAme) then
   'Get Name
     Set MySlot = YourCollection.Item(SlotID)
     PatientName = MySlot.patientNAme
     call yourCollection.ChangeName(SlotID, NewNAme)
End If


Expert Comment

ID: 2635159
If you have your collction class set as PublicNonCreatable you should be able to expose it.

in your USercontrol try

Private m_Slots as clsSlots

Public Property Get Slots() as clsSlots
   Set Slots = m_Slots
End Property


If this wont work then what error are you getting when you try it.

LVL 10

Accepted Solution

caraf_g earned 400 total points
ID: 2644077

Expert Comment

ID: 2644147
That looks right!!

Pretty much what I said!!

The Sooner EE gets binary attachments the sooner we can all post decent sourcecode.


Author Comment

ID: 2701495
Dalin's answer worked.
caraf_g's anwser is good too, so is Gordonp's comments.

Thanks everyone. I will award each of you with 400 points.
Thanks for the help

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