VS 2008 Return Listview Item Collection In Multithread?
Aug 31, 2009
I am doing this within a thread:For Each item As ListViewItem In lvUsers.Items and I am getting: Cross-thread operation not valid: Control 'lvUsers' accessed from a thread other than the thread it was created on.I have been able to adjust a control in a way using something like:
Public Delegate Sub ListAddNameInvoker(ByVal text As String)
Public Sub ListAddName(ByVal text As String)
If lvUsers.InvokeRequired Then
[code]....
But how do I get data from a control and pass it to another thread?
i am new with multithreading in vbnet. i got this error.Cross-thread operation not valid: Control 'lvSample' accessed from a thread other than thethread it was created on.this is my code.
Private Sub xFormLoad(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim t As Threading.Thread
I'm trying to create an inherited version of the ListView control that (among other things) should have a different background image if the listview is empty to if it has items.Obviously you can easily enough test the count of the collection, but I need to be able to react to the event, however there doesn't appear to be any event related to adding/removing items.
I am filling a listview control with a big number of items but i came across an problem, the repeated values. In those items i use .Text and .Tag so i can relate some hidden values per item. I have been trying to use the items.find() with no luck since it looks like to search for keys, which i don't really have. Every item has different .Tag values but it can happens that they have the same .Text Is there any way to remove or just not add items based on a .Text search in the ListView?
I am trying to add tooltip to each item in a listview but they dont seem to come out. I tried setting the .ToolTipText = "text" on each item but when i put mouse over each item, nothing appear. What am i doing wrong?
Using the following code to add results from sql to a listview. Is there anyway that I can make a comparison from the reader against all currently existing item strings?
vb.net LstResults.Items.Clear() If con.State <> ConnectionState.Open Then Try con.Close()
I was trying to at random select a listview item, I tried: Dim random As New Random Dim test As String = random.Next(0, formMain.ListViewSearchResults.Items.Count) MessageBox.Show(test) but this brings me back a "0".
I have a listview, and when you right click, it shows some things. I need to make it see if an item on the listview is selected. Is there a way to do this?
Like, this doesn't work, but in code it would be like
If listview1.HasItemSelected = true then'code here end if
I want to retrieve the selected item in my listview as a string. I have 2 columns, Name and Version. When i click a button it should come up the value of the column Name of the item that is selected.
I remember doing this in a checkboxlist element, but with listview element its giving a hard time.
Private Sub CheckedListBox1_ItemCheck(ByVal sender As Object, _ ByVal e As ItemCheckEventArgs) Handles ListView1.ItemCheck If e.NewValue = CheckState.Checked Then For index = 0 To Me.ListView1.Items.Count - 1
ok I made my self a listview with a checkbox on it. I was wondering if it was even possible to add something to my form so when I build my project and I rightclick on my list view item a menu will open saying:
delete item Clear Item
A menu (not a form) just like when you do a right click on your mouse.
I need to add multiple images to a list view item dynamically. For example, if an alarm exceeds limit one image has to be displayed and is fine with me.But when the user clicks alarm inhibit checkbox,then two images has to be displayed,one for alarm existance and second for manual operation which represents the user action.Both the images have to be displayed under one column only..
I would like the following function to return Nothing if the element with the specified key is not in the collection. Instead, it returns an error - something to the effect of "no element found"
Public Class MyCollection Inherits System.Collections.ObjectModel.Collection(Of MyType) Public Function FindByActivityKey(ByVal searchValue As Integer) As MyType
I have a listview with a few items like below. What I need is when I select an item in the listview then click a button it will go to the url that in the second column in a webbrowser. So when I select an item then click a button it will do webbrowser1.navigate(listview1.selecteditem) or something like that but I cannot figure out how to get just the url.
I am trying to programmatically select all items, including subitems, in a listview and can't seem to get the result I am looking for. I have FullRowSelect = True set and when I click on the items, all is fine. However, if I use the following code, only the ListViewItem is selected and not the item's subitems. Is there a way to achieve this?
how to, by a listview selected item make an picturebox appears?for exemple. got a listview in a form, and a hide picture box, and when i select an listview item, the picture box appears, turn the visible to true.
I am trying to successfully multithread a piece of software I have been working on. I have an array of threads 'gen' already working, calling to a method taking a single integer as a parameter (done via typecasting).Now in this thread, when the function gets processed (for each thread a roughly 500 iteration while loop) the index seems to be getting mixed up. As far as I can tell, my threads are messing with eachother and warping values. Now this is happening in locally declared variables inside this function, not global variables.It may be useful to know that I am using a WebRequest via a call to another method. Don't know if that makes a difference or not.
And I select one and it works! But when I try to select a different one it comes up with an error on..If ListView2.SelectedItems.Item(0).Text = "None" Then The error..InvalidArgument=Value of '0' is not valid for 'index'. Parameter name: index
I have a list view control and for each item I set to display an icon it will change the icons for the other items that already have icons, to the most recently added icon.
Here is my code.
vb.net Dim ext As String = Strings.Right(e.Item.Text, 4) Dim fileandparam As String = IconsInfo(ext).ToString
I'm trying to manipulate something that is in a different thread, and I know I need to do something by the way of Invoked procedure, but I'm unclear on how. I looked up some examples here on the forums and tried to follow the basic template, but I continue to have the same problem. how to use invoke correctly.
Private Sub getMessage() For Me.infiniteCounter = 1 To 2 'Try
I currently have a browser go through the same list of sites one by one and gather updates. The problem though this takes awhile. Can a browser be multithreaded, (so it could visit several sites at a time) and if so would this take up a lot of server resources?
Ok, so I have a listview on one form, and when a button is pressed it opens up a new form with the contents of the selected listview item and it's subitems in a series of textboxes. The user can then change the data in the textboxes and either press save to make the changes or cancel to close the window. What command would I use to change the selected listview item and subitems to whatever is in the boxes?
this is the code that populates the boxes:
Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim appeditcontents As String = main.passlist.SelectedItems(0).ToString
How would I create a function to return one database row in a collection, such that the rows column name & value are stored as key/value pairs in the collection?
