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ListView issue

I have a strange one here and I believe it is a bug. I googled it and saw
others having a similar issue and nobody seems to have a fix. I will take
another shot.

I get this ERROR MESSAGE...

"Specified argument was out of the range of valid values. Parameter Name:
'9' is not a valid value for 'index'."

....when I attempt to "Refresh" a ListView control AFTER it has been sorted.
I have tried by Sort classes below because, inexplicably, MSFT stripped the
column-click Sort capabilities from the .Net ListView control. If I do not
sort the ListView and refresh it, it works fine.

I am populating the ListView from a DataReader and it works great. The
function is used over and over and it only fails after a sort. Basically,
the users select a few rows in the list, some SQL executes using their
values, and the ListView refreshes via the function I wrote. It works.

The strangest part of this error is that it adds the first item to the list
successfully every time, but fails when adding the second item which was
successfully created. I have been playing with this all day. It appears to
be a Bug. If anyone has overcome this issue, please let me know. All Sort
class code is below.

Thank you!

Mike Barrett



Public Class CSortClass
Implements IComparer
Private mColumn As Integer
Private mNumeric As Boolean
Private m_bAltSort As Boolean

Public Property column() As Integer
Return mColumn
End Get
Set(ByVal Value As Integer)
mColumn = Value
End Set
End Property
Public Property Numeric() As Boolean
Return mNumeric
End Get
Set(ByVal Value As Boolean)
mNumeric = Value
End Set
End Property
Public Property AltSort() As Boolean
Return m_bAltSort
End Get
Set(ByVal Value As Boolean)
m_bAltSort = Value
End Set
End Property

Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer
Implements System.Collecti ons.IComparer.C ompare
Dim lv1 As ListViewItem = x
Dim lv2 As ListViewItem = y
If mNumeric Then
If m_bAltSort = True Then
Return CLng(lv1.SubIte ms(mColumn).Tex t) +
CDbl(lv2.SubIte ms(mColumn).Tex t)
Return CDbl(lv1.SubIte ms(mColumn).Tex t) -
CDbl(lv2.SubIte ms(mColumn).Tex t)
End If
If m_bAltSort = True Then
Return String.Compare( lv2.SubItems(mC olumn).Text,
lv1.SubItems(mC olumn).Text)
Return String.Compare( lv1.SubItems(mC olumn).Text,
lv2.SubItems(mC olumn).Text)
End If
End If
End Function

End Class


Imports System.Collecti ons
Imports System.Windows. Forms

Public Class ListViewColumnS orter
Implements System.Collecti ons.IComparer

Private ColumnToSort As Integer
Private OrderOfSort As SortOrder
Private ObjectCompare As CaseInsensitive Comparer

Public Property SortColumn() As Integer
Set(ByVal Value As Integer)
ColumnToSort = Value
End Set

Return ColumnToSort
End Get
End Property

Public Property Order() As SortOrder
Set(ByVal Value As SortOrder)
OrderOfSort = Value
End Set

Return OrderOfSort
End Get
End Property

Public Sub New()
' Initialize the column to '0'.
ColumnToSort = 0

' Initialize the sort order to 'none'.
OrderOfSort = SortOrder.None

' Initialize the CaseInsensitive Comparer object.
ObjectCompare = New CaseInsensitive Comparer
End Sub

Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer

Implements IComparer.Compa re
Dim compareResult As Integer
Dim listviewX As ListViewItem
Dim listviewY As ListViewItem

' Cast the objects to be compared to ListViewItem objects.
listviewX = CType(x, ListViewItem)
listviewY = CType(y, ListViewItem)

' Compare the two items.
compareResult =
ObjectCompare.C ompare(listview X.SubItems(Colu mnToSort).Text,
listviewY.SubIt ems(ColumnToSor t).Text)

' Calculate the correct return value based on the object
' comparison.
If (OrderOfSort = SortOrder.Ascen ding) Then
' Ascending sort is selected, return typical result of
' compare operation.
Return compareResult
ElseIf (OrderOfSort = SortOrder.Desce nding) Then
' Descending sort is selected, return negative result of
' compare operation.
Return (-compareResult)
' Return '0' to indicate that they are equal.
Return 0
End If
End Function
End Class


Function Fill_ListView(B yVal lsv As ListView, ByVal rdr As
SqlClient.SqlDa taReader) As Boolean
Dim bRetVal As Boolean = True
Dim intLoop As Integer
Dim id As String
Dim intCol As Integer

' prepare for update
lsv.BeginUpdate ()

' clear list
lsv.Items.Clear ()

While rdr.Read
id = rdr.Item(0).ToS tring
Dim lvi As New ListViewItem(id )
lsv.Items.Add(l vi)

For intCol = 1 To (rdr.FieldCount - 1)
lvi.SubItems.Ad d(rdr.Item(intC ol).ToString)

End While

' refresh list
Catch ex As Exception
bRetVal = False
MsgBox(ex.Messa ge, MsgBoxStyle.Cri tical)
Fill_ListView = bRetVal
End Try
End Function

Nov 20 '05 #1
0 1442

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