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I need to loop through data and add nodes to an UltraTree object for each facility. But it fails when there are multiple records for a given facility.

System.ArgumentException: 'Key already exists, key: ts1'

So I'm trying to check the existing nodes and only add if it isn't already there.

'facNode is an UltraTreeNode
'nodeName is a string

If (facNode.Nodes.Contains(nodeName) = False) Then
    Dim selectable = facNode.Nodes.Add(nodeName, "Study Director " & studyFacility.SMStudyDirectorName)

    [Do Stuff]
End If

Unfortunately, facNode.Nodes.Contains(nodeName) always evaluates to false. Visual Studio says, "The expression causes side effects and will not be evaluated."

I've found many threads/articles that say each key must be unique, but I have not been able to find the proper syntax to check if a key already exists.

Patrick M.
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1 Answers1

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I figured it out. It's the Exists() method instead of Contains().

If (facNode.Nodes.Exists(nodeName) = False) Then

Patrick M.
  • 1
  • 1