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VB.NET - Delegates & Exceptions with ListView

Posted on 2008-11-01
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Last Modified: 2012-05-05
I have a timer that updates a ListView.. the code is:

        If ListView.InvokeRequired Then
            If ListView Is Nothing Then
                ' temp
            Else
                ListView.Invoke(New PopulateListViewDelegate(AddressOf PopulateListView), ListView)
            End If
        Else
            PopulateListView(ListView)
        End If


I'm getting an error on the line: ListView.Invoke(New PopulateListViewDelegate(AddressOf PopulateListView), ListView)

The error is the standard first chance exception about declaring the object with "New" (the whole line is highlighted so I'm not sure which object its talking about)

I'm not sure what I'm doing wrong, this appears to work fine and then randomly bugs out on me...

Could this object error be in the PopulateListView Sub but showing here?
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Question by:mcainc
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3 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 22860312
Try it this way:

        If Me.InvokeRequired Then
            Me.Invoke(New PopulateListViewDelegate(AddressOf PopulateListView), New Object() {ListView})
        Else
            PopulateListView(ListView)
        End If
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Author Comment

by:mcainc
ID: 22860553
thanks, im having another similar weird issue in this sub

    Private Sub StartClient(ByVal Index As Integer)
        client(Index) = New ChatClient

        Thread.Sleep(100)
        client(Index).Initialize(Index)
        client(Index).Start()
    End Sub


I get the NullReferenceException "Object reference not set to an instance of an object" on the line: client(Index).Initialize(Index)

Do you have any idea why this might happen?
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 22860565
No idea...that one makes no sense...  =\
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