Get ListViewItems And SubItems From Another Thread
Nov 7, 2010
i have been working on a customer database project. i created a user control with ListView control for Customer details. and an another user control was created for Product details. both controls are placed in main form.I am trying to get Customer details and Product Details from separate thread but i faced CROSS THREAD...Error how can i overcome this problem.
this is my main process
Public _lstVwCstDet, _lstVwPrdct As New ListView
Private Sub M_ProcessStart()
_lstVwCstDet = frmMain.axCustmrCnt.LstVw
[Code]....
I want to Get List View Items and it's Subitems from an another Thread.
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Dec 6, 2009
Here's an interesting issue:I've got a listview on a form that will load up properly, but as soon as I get my proxy (multithreaded) going, the listviewitems inside the listview suddenly cease to exist.
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Nov 16, 2010
I am trying to sort an array of ListViewItems, here is my code for setting is up:
vb.net
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Apps(), Owners() As String
Apps = {"App2", "App1", "App4", "App3", "App5"}
Owners = {"AOwner2", "BOwner1", "COwner4", "DOwner3", "Owner5"}
Dim ListViewItemArray(Apps.Count - 1) As ListViewItem
[Code] .....
I know I can have the ListView be sorted but I want the item "All" to stay at the top. I have tried sorting the array with:
vb.net
Array.Sort(ListViewItemArray)
But I get this error: "Failed to compare two elements in the array.".
I also tried:
vb.net
ListViewItemArray.Sort()
But it says there is invalid number of arguments. Is it possible to sort this array or is there an easier way to accomplish what I am trying to do?
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Aug 3, 2011
I'm trying to use a BackgroundWorker process to update the status on servers once a Refresh button is hit.add all ListViewItems to an ArrayList and pass that ArrayList to the worker process to update. Once it was done updating, I would clear all items from the ListView, and then refresh the ListView with the new ArrayList with the updated ListViewItems.When I get to this line of code in the RefreshListView function:
'POS_IP_ADDRESS is just a constant I created with the column index in the event I decide to change the layout of the list view columns at a later time
objItem.SubItems(POS_IP_ADDRESS).Text = strIPAddr
I get a InvalidOperationException stating Cross-thread operation not valid: Control lstStatus (my list view object) access from thread other than the thread it was created on.Do the ListViewItem objects have a tie back to the original ListView items when I pass the ListViewItems to the ArrayList? I just want to edit the objects in a buffer and refresh the ListView... does this make sense to do? Why can I not update the item in an ArrayList?
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Aug 13, 2010
In one application, I need use 4 simultaneous threads.When the threads finished, I need to update the text of a TextBox.So, I create 4 Textbox, and I wanna the threads change the text to FINISHED.Each thread change one distinct TB.I use this "example"
Dim Terminados As Integer = 0
Private Sub frmEnviarMensagem_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
Timer1.Start()
[code]....
The problem is, I have an error in the red lines.The error is: INVALIDOPERATIONEXCEPTION "Cross-Thread operation not valid: Control tbPlaca1 Accessed from a thread other than the thread it was created on."I don't use cross threading. Each TB only was accessed for the correspondent thread, and for the "main program".
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Nov 3, 2011
This is the error message I am getting:
"Cross-thread operation not valid: Control 'Panel1' accessed from a thread other than the thread it was created on." The reason I am getting this error is because I am opening up a new form and then calling these three things:
Panel1.Show()
Label1.Show()
Label2.Show()
why I get this error message because it doesn't occur normally if I open Form2 after closing Form1, it only occurs when I open Form2 after closing Form4.
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Jul 21, 2009
I have done a program using vb2005 to display reading from my microcontroller bs2 board but have encountered some problems. My code are as follows.
Dim Stop_Rx As Boolean
Private Sub btnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRead.Click
SerialPort1.Open()
[code]....
I've encounter an error which is, (Cross-thread operation not valid: Control 'txt1' accessed from a thread other than the thread it was created on.)
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Jun 21, 2012
When my client try to connect to server I'm getting this error : Cross-thread operation not valid: Control 'l_users' accessed from a thread other than the thread it was created on.
Private Sub _socketManager_onConnectionAccept(ByVal SocketID As String) Handles _socketManager.onConnectionAccept
l_Users.Items.Add(SocketID)
End Sub
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Feb 17, 2012
Would anyone be able to help me here please. I'm fairly new to VB.net and threading so im just trying to figure out what is happening.When I debug this I am getting the error thread operation not valid: Control 'ProgressBar1' accessed from a thread other than the thread it was created on.
I'm a little lost as to why the error is occuring or how to fix it. I've had to put the progress bar in a separate thread otherwise the GUI crashes
[Code]...
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Sep 2, 2010
My understanding is that thread.join will suspend the execution of code on the calling thread until the spawned thread finishes or is aborted...
With that in mind, I tried this:
For i = 1 to 50
threads = New Thread(AddressOf test)
threads.IsBackground = True
threads.SetApartmentState(ApartmentState.STA)
[CODE]...
However, the rest of the code runs when the loop finishes, not waiting for all the spawned threads to finish. Since the rest of the code needs the threads to finish (otherwise the rest will error).
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Jun 6, 2010
I have written an application that loads a form - frmCad as well as AutoCad. It does this via a class which detects when AutoCad quits.
Friend Class CadApp Private WithEvents AppObject As AcadApplication... Private Sub AppObject_BeginQuit(ByRef Cancel As Boolean) Handles AppObject.BeginQuit RaiseEvent Quit() End SubEnd Class
My main class loads frmCad as well as CadApp.
Public Class Cad Private WithEvents frmCad As CadForm Private WithEvents app As CadApp... Public Sub ShowForm() If frmCad Is Nothing Then frmCad = New CadForm frmCad.Visible = True End Sub... Private Sub app_Quit() Handles app.Quit frmCad.Dispose() frmCad = Nothing .... End Sub
When I debug the program, it stops at frmCad.Dispose()The program continues to execute, but all the code after it fails to work.Looking more carefully I get an error message which contains:-Cross-thread operation not valid: Control 'Autocad' accessed from a thread other than the thread it was created on.
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Feb 9, 2011
My error:Cross-thread operation not valid: Control 'label2' accessed from a thread other than the thread it was created on. I want to be able to give my Public RunBot() sub access to edit Labels, buttons, etc without an error.
[Code]...
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Apr 1, 2010
I'm getting the 'System.InvalidOperationException' error on acccessing a thread from other than where it was created. My code is:
'Required by the Windows Form Designer
Public components As System.ComponentModel.IContainer ' changed from private
[code]....
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Jun 6, 2009
My problem is Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on.
System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
StackTrace:
[Code]...
i used it and it works fine then. but as it is mentioned its not a good practice to use it. So what should i do? is it ok if i use this as i am not able to use correct practice. Mine application is not for enterprise purpose. its just my class project, and it works fine even if i put application working in background. System works ok. I dont know how to correct this error.As i dont have that much knowlege of threads.
So please guide me how to fix this in correct way otherwise i am force to go for bad programming practice
Please refer to Windows Mobile Developer Center > Smart Device Development Forums > Windows Mobile Development > Appendtext not working for all my code details
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Aug 4, 2009
Cross-thread operation not valid: Control 'lv1' accessed from a thread other than the thread it was created on.
Dim lvi As ListViewItem
For Each lvi In lv1.Items
[code]....
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Feb 7, 2011
Ok i have a Form with the following
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
txtNotepad.Text = LoadFile("notes.txt")
[code].....
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Mar 8, 2009
The correct code:
Private Sub tvFolders1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles tvFolders1.AfterSelect
Dim id3folder As String
[CODE]...
I'm now trying a different approuch to my previous problem with the TreeView/ListView issue I had, this new "sollution" seems to be a bit more easy however I still can't solve it. The problem is to add the remaining listview.subitems, everything I try ether a: crashes app, or b: Only adds one subitem. If you take a look at the code you should see where my problem is.
Private Sub tvFolders1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles tvFolders1.AfterSelect
Dim id3folder As String
id3folder = e.Node.FullPath()
[CODE]...
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Aug 12, 2011
just plain and simple and no fancy codes as im new. How do i add subitems to my listview. my listview is called "Listview1" ands im on vb2008
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Sep 8, 2010
Ive been trying to add images in SUBitems in a listbox. After some plundering i figured out they've somewhy removed that property in vb.net 2010. Ive tried several results ive found on google, url... but that didnt seem to work in vb.net2010 (or am i just not good at copypasting?). Anyway i need a brither mind than mine to work out some other solution. Im not required to use listbox, but hopefully something similar. Ive taken a look at DataGridView, but i really dont want to process that little information i got, into a database.
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Jul 16, 2010
I'm trying to get the first subitem's text from an item in my ListView. Here is the code I'm using[code]...
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Jun 5, 2011
How can i compare a subitem from my listview1 to my listview2 subitem, like for ex. subitem(3)?
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Nov 28, 2011
Does anyone know how you can edit the subitems of the listView in the same way as you can the items text labels (this first item in the row)?
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Oct 24, 2010
okay hi in this newb question i wanta change every subitem there is in the whole field of listview.for an example
Dim KCounter As Integer
For KCounter = 1 To ListView1.Items.Count
ListView1.Items(KCounter).SubItems(2).text = "Void"
[code]....
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Apr 27, 2007
heres a code on my form load event
Me.EmployeesTableAdapter.Fill(Me.TechnoCallDataSet.Employees)
Dim counter As Short
Dim columnheader As ColumnHeader
[code].....
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Jan 28, 2009
I'm trying to find out how to Edit/add/read individual subitems in a populated Listview box I seem to be going round and round in circles looking on the "net"
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Apr 28, 2009
I was attempting to follow a few tutorials for the ListView control. I am able in the designer to add items and subitems but I want to be able to add them in at runtime. I can do ListView1.Items.Add quite fine but when I attemp to input ListView1.SubItems (As the tutorial suggests) I get an error that is: Code: 'SubItems' is not a member of 'System.Windows.Forms.ListView' I am using Visual Basic.NET 2008 Express.
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Jul 31, 2009
How can I add an item with 2 subitems in a listview with a click of a button?
I have 3 textboxes(name, age and gender) and i would like a button to make a new item in a listview which has 3 columns(name, age and gender).
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Jun 19, 2012
saving a listview with its subitems. I have 2 buttons when one is clicked it loads listview items and then when I click the other button it clears the listview and loads more listview items. My question is how do I save a listview before the listview is cleared and also loading a saved listview?
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Feb 18, 2012
I am trying to chnage a listviews subitem forecolor but it not seem to be working I can set the text color of the first item but not the second here my code.
vbnet
Dim Litem As ListViewItem
Litem = New ListViewItem()
[Code]....
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Aug 25, 2009
I am trying to set the tool tip text for some of my subitems in my listview control. I am unable to get the tool tip to show up.
[Code]...
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