BUG: ListBox - ListIndex Value Not Updated Correctly In Loop with AddItem (248226)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 6.0
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



  1. 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
  2. Click the command button Add Item.
  3. Notice the contents of the list box are not ordered correctly.
Modification Type:MajorLast Reviewed:10/15/2002
Keywords:kbBug kbCodeSnippet kbContainer kbCtrl kbDSupport KB248226
©2002 Microsoft Corporation. All rights reserved.