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Tip of the Day
Language:
Expertise: Intermediate
Aug 6, 1997

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Application Security Testing: An Integral Part of DevOps


ListView Controls Don't Accept Numeric Keys

In a collection object, such as the ListItems collection from the ListView control, or simply a generic VB collection object, you can specify a key to uniquely identify the item. Documentation states the key can be any String expression. What if the key needs to be a numerical string? In a ListView control, you might not set a numeric key. Even if you try to set a key equal to Str$(), you'll receive an error message. When displaying the results of a recordset with a ListView, the key would be the perfect place to hold the primary key for the row, if applicable. Because ListView doesn't have an ItemData property, the key is the only place to hold it. The solution is simple: append the string "key" to your Numeric Key, and use the Val function to retrieve its value:
 
Set itemX = lvPeople.ListItems.Add_
        (, , strName)
'Set the Key
itemX.Key = Str$(rstPeople!PersonID) _
        & "key"

        Use this code to retrieve the key:

lKey = Val(lvPeople.ListItems_
        (nIndex).Key))
Steve Danielson
 
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