I had a question about some logic of the InvokeRequired with a ListView. I have the following
vb.net
Public Sub ListviewSub If ListView.InvokeRequired = True Then Dim t As New MethodInvoker(AddressOf ListViewSub) picCurrent.Invoke(t) Else RunSub() End IfEnd Sub
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This code works fine in VB 2008 attempting to redo the program in vb2010:
in the GuiForm:
the following is declared in formgui:
Private Delegate Sub UpDateGSLDelegate(ByVal rpn As Integer)
Also the following sub is also in formgui:
Public Sub updateGSLDisplay(ByVal rpn As Integer)[code]....
"UpdateGSL", in turn, will be called from any subs running in another module in a separate thread.The purpose is to update one or more labels on formgui based on the "rpn" variable.now the program will just hang at " Invoke(New UpDateGSLDelegate(AddressOf UpDateTheGSL), rpn)" in the "updateGSLDisplay" sub. no error messages, just stops.also I'm now using the " Dim t1 As Task = Task.Factory.StartNew(Sub()" way to starting a new thread in case that is revelant.what has changed from 2008 to 2010 to cause this. Just started trying out vb 2010? How can I fix this in 2010?
I looked at this page: http:[url]...aspx but it doesn't say anything or maybe it does and I just didn't pickup on it.
I am using the under given code in a module and I am getting an error ['Me' is not valid within a Module]
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instead of using if control.invoke required in a procedure can I just call the procedure with begininvoke?I have, possibly, the following:
Private Sub UpDateTimer_Elapsed(sender As Object, e As System.Timers.ElapsedEventArgs) Handles UpDateTimer.Elapsed
UpdateTime()
If MicActive Then
PTTCancelTime += 1
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where is the best place to learn InvokeRequired and BeginInvoke.
View 4 RepliesMe.datagridview.InvokeRequired property means in vb.netadil
View 3 RepliesI read Accessing Controls from Worker Threads and implemented this
Private Sub myExplorer_Close() Handles myExplorer.Close
If Me.InvokeRequired Then
Me.Invoke(New MethodInvoker(AddressOf myExplorer_Close))
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I have a (legacy) form where I had to add the InvokeRequired/BeginInvoke(Delegate) to avoid the "Control control name accessed from a thread other than the thread it was created on." exception.This seems to work fine but there are some scenarios where the BeginInvoke is not calling the Delegate (which I can tell from the output log). [code]
View 1 RepliesI have the following test code. It does nothing useful, but it's there for me to understand VB:
Imports System
Imports System.IO
Imports System.Diagnostics
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I am working with tasks, so I've got the following code to update a label on my form:
Private Delegate Sub UpdateLabelDelegate(ByVal s As String)
Public Sub UpdateLabel(ByVal s As String)
If Me.InvokeRequired Then
Me.BeginInvoke(New UpdateLabelDelegate(AddressOf UpdateLabel), New Object() {s})
Return
I have a vb-2008 program that contains a (listview) control.
View = details
AllowColumnReorder = true
Lets say the table has 3 columns (a,b,c) and 1 row of data.
a b c
1 2 3
I want the user to be able to re-arrange the columns (by dragging the column headers) before printing the contents of the table.
c a b
3 1 2
Statements like:
.. ListViewX.Columns(2).Text
.. ListViewX.Columns.Item(2).Text
.. ListViewX.Items(0).SubItems(2).ToString
Give the column-name (c) and cell-contents (3) of the origional table .. not the (3rd) column (b) of the re-arranged table.
How can i get the column-name and cell-contents of the (3rd) column of the re-arranged table?
Do I really have to go through all this just to find out what item has been selected in a ListView?
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Isn't there something fundamental like this? Is absolutely everything in VB.NET buried beneath a colossal heap of bureaucracy?
i am developing a point of sales system. currently i have my product code scanned and displayed in a listview. lets say that i have 5 product codes displayed in my first listview. By clicking on a button, how can i use these codes to call upon the details (prices, product name, etc.) of the corresponding codes and display in another listview?
i am using Visual Basic 2008 and MsAccess as my database. who have the idea on solving my question. (As my last thread has not been answered at all..
I want ListView instead of CheckedListBox files in checkedListBox is being updated via ListBox1 How can I add the size of file too in listview
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I have a listview control. it has an imagelist attached to it with two images in it. I have entered items into my listview, and they are using the first image in my imagelist.... GREAT! Now, there is a variable I have that will tell me which index in the listview is currently active, noting to do with what I select that could be at another index it's just what's being processed by the program at the time in some task.
Create a function that will change the images of all my listview items by looping through them. If the index variable is set to 2, I want the 3rd item in my list view set to use the 2nd image in my imagelist. The rest of the items in my listview need to be set to the first image in the imagelist.
i want to format listview head of listview textalign = center and item of listview textalign = right
View 1 RepliesI am trying to figure out a way to include the listview's tag field when dragging one listview's subitems into another listview. I am hoping someone here has experience with this. My Listview drag code is below - the two listviews that I am dragging subitems into or from are LV1 and LV3. Also, this is being done in Visual Basic 2008 and the project is a windows application.
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I would like my program to list files from a specific directory using the listview control. For an example, listing .temp files from (C:Documents and SettingsDefault UserLocal SettingsTemp) and (C:Documents and SettingsDefault UserRecent), how would I list all the files within the listview control?
View 4 Repliesthe below code is on a form2..but the listview it must add these items to is on the Form1. I had to use a delegate just to get it to check if a file contains a specific Character. to add 1 to the lables as number of manuals found Everything seems to be be working except it isnt adding items to the lisview, correction. i think everything is working ok and it's not adding items to the listview. I'm trying my best to understand the thread process, but thus far all i get is confusion,when something does'nt work. add items from form2 to a list view in form1 using threading [Code]
View 10 RepliesI want to have each row in the listview (the view mode is set to detail) have a row #. I COULD set the item text as a row #, but that's kludgy and means sorting has to be customized because the REAL item text is in subitem(1). Is there a way to have a label on each row in a listview that shows the row #?
View 1 RepliesI'm having a hard time setting tooltiptext for a listview. I read in msdn that full row select changes how it behaves but regardless of what I try I cannot get it to display. Basically what I'm looking for is when you have the mouse over a column in a list view that the tool tip text appears describing what that column is showing. This is a list view in DETAIL mode.
View 2 RepliesI'm not 100% how I could describe this, so I made an image.
So what I want is to have a listview with items in the middle. Say
Green
Blue
Orange
And then on either side of those I want the default to be 1's, like on the image. And then I want to be able to press < or > when I have say Green selected and press - or + and it will increment the numbers. Like the second part of the image when the < is 1 and the > is 0.
Im trying to make my btn add all the file info to the listview. The listview has : icon + file name/type/bytes/directory. How would i make my Btn open folderbrowserdialog and let the user add it. It will then add all the info to the listview. How would i do this?
View 3 RepliesIf tbquantity.Text = "" Or tbdescription.Text = "" Or tbprice.Text = "" Or tbproductcode.Text = "" Then MessageBox.Show("Please Select Items", "Empty", MessageBoxButtons.OK) Else If lvadd.Items.Count = 0 Then lv = New ListViewItem(tbproductcode.Text) lv.SubItems.Add(tbdescription.Text)
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This program includes a working ListView which displays 50 lines, one for each state in the USA. I'd like to print out this information, plus 4 more columns of information associated with each state, including light grid lines, by simply clicking on a print menu item. I don't need a footer, but I do need 2 or 3 lines of formatted header information, and I'd like to fit this all on a single page.
View 3 RepliesI have these codes which when selected items in listbox it display files in CheckedListBox ...
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how can I use ListView instead of CheckedListBox ..so that in ListView I may able to show file name as well as file size In ListBox .. this peace of code shows only file name ... how can I declare file size so that I can get file name and file size in ListView CheckedListBox1.Items.AddRange(DirectCast(ListBox1.SelectedItem, [Soda]).files)
Dim sb As New System.Text.StringBuilder
For Each item In ListView1.Items
sb.AppendLine(item.ToString)
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I'm a beginner, and this is an assignment - I have a form with a menu strip and a listview.I also have a separate class that handles everything.When there is data in the listview, and one row is selected, I need to be able to remove that row when delete is clicked in the menu strip.The code I need to use for the delete is below. Currently it's just sitting in the class, and I don't know how to use it.
Public Sub Delete(ByVal item As employee)
If IndexOf(item) >= 0 Then '"IndexOf" looks for item, returns -1 for not found
DeleteAt(IndexOf(item))
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I'm loading files into a listview (1), which works fine. Now I'm trying to load records into another listview (2) according the Listview1.SubItems(2)-record.I tried several times, but without succes. One of the commands;
Dim cmd_data As New SqlCeCommand("SELECT Field1, Field2, Field3, Field4, Field5, Field6 FROM Tablename WHERE Field2 = Name_Form.Listview1.SelectedItems(0).Subitems(1).text", connStr)
How do i get this code to load in to a listview rather than a gridview?
code
Private Sub loadCustomers()
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