Knowledge Base

BUG: ListBox - ListIndex Value Not Updated Correctly In Loop with AddItem

Article ID: 248226

Article Last Modified on 10/15/2002

APPLIES TO

Microsoft Visual FoxPro 6.0 Professional Edition

This article was previously published under Q248226

SYMPTOMS

Adding items in a list box using the AddItem method and including the ListIndex property in a loop gives unordered entries in the list box.

CAUSE

The problem is due to the fact that the value of ListIndex, which is being used to increment ListIndex property, does not return the correct value.

RESOLUTION

Use a memory variable to store the incrementing value instead of the ListIndex property.

Replace the Click event of the Command1 with the following:

PROCEDURE command1.Click
    local lnI, nCn
    with thisform
        nCn=.list1.ListIndex
        FOR lnI = 1 TO 50
            .list1.AddItem(" "+STR(lnCounter), nCn+1, 1)
            nCn = nCn + 1
            lnCounter = lnCounter + 1
            .list1.ListIndex=ncn
        NEXT
    Endwith
ENDPROC

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

Create a program and include the following code in it. Save and run the program.

******* Start of the Code
PUBLIC oform1

    oform1=NEWOBJECT("form1")
    oform1.Show

RETURN

DEFINE CLASS form1 AS form
    Top = 0
    Left = 0
    Height = 452
    Width = 633
    DoCreate = .T.
    Caption = "Form1"
    WindowState = 2
    Name = "Form1"

    ADD OBJECT command1 AS commandbutton WITH ;
        Top = 180, ;
        Left = 144, ;
        Height = 48, ;
        Width = 216, ;
        FontBold = .T., ;
        FontSize = 15, ;
        Caption = "Add Item", ;
        Name = "Command1"

    ADD OBJECT list1 AS listbox WITH ;
        ColumnCount = 1, ;
        ColumnWidths = "60", ;
        RowSourceType = 1, ;
        Height = 120, ;
        Left = 144, ;
        Top = 24, ;
        Width = 204, ;
        Name = "List1"

    ADD OBJECT command2 AS commandbutton WITH ;
        Top = 240, ;
        Left = 144, ;
        Height = 48, ;
        Width = 216, ;
        FontBold = .T., ;
        FontSize = 15, ;
        Caption = "Quit", ;
        Name = "Command2"

    PROCEDURE Load
        PUBLIC lnCounter
        lnCounter = 0
    ENDPROC

    PROCEDURE command1.Click
        local lnI
        with thisform
            FOR lnI = 1 TO 50
                .list1.AddItem(" "+STR(lnCounter), .list1.ListiNDEX+1, 1)
                .list1.ListIndex = .list1.ListIndex + 1
                lnCounter = lnCounter + 1
            NEXT
        Endwith
    ENDPROC

    PROCEDURE command2.Click
        thisform.release
    ENDPROC

ENDDEFINE

******* End of the Code

Click the command button Add Item.
Notice the contents of the list box are not ordered correctly.

Additional query words: KBDSE

Keywords: kbbug kbcodesnippet kbcontainer kbctrl kbpending KB248226

Microsoft KB Archive/248226

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