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Iterating user collections

I have a class Chair in my system. Now I want to deal with typed collections of chairs, so I have defined a ColChair class, with a collection-like interface: Add, Remove, Item and Count. I have made Item the defaut property. The problem is I can't iterate the collection with a "For Each" construct; it crashes at run-time:

  Dim col As New ColChair
  'fill col with Chair objects.
  Dim ch As Chair
  For Each ch In col 'this line crashes.
    'do something with ch.
  Next ch

Any ideas?.

Regards,
César.
0
CesarGon
Asked:
CesarGon
1 Solution
 
MikeP090797Commented:
What error to you get?
0
 
Belgarion_ausCommented:
Add the following method to your collection class:

Public function NewEnum() as IUnknown
   
    Set NewEnum = mycollection.[_NewEnum]

End Function

Yes, the square brackets [] MUST be there !

Now go to tools/Procedure Attributes

In the name box select the NewEnum Method,

click advanced and select hide this member,

In Procedure Id box type -4. -4 is the procedure ID that implements For Each....Next.

And your done! Now For Each....Next will work.


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CesarGonAuthor Commented:
Thanks for your reply. It really works!. To satisfy my curiosity, please may you tell me where you learnt the solution?.

Regards,
César.

0

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