Refresh Label From Inside A Thread Not Working?
Feb 2, 2012
I am using Visual Studio 2010 and have been slowly getting into threading. My current project has a form with a button that in turn starts two threads. The form itself has two labels on it that are used to display the progress of the computations. Each thread has a delegate defined to change the value of the respective label (as the labels are not defined in the thread, but on the form itself). The threads call subs from a separate class. All of the calculations work flawlessly. My problem is that the labels do not visually update. Through use of message boxes at the end of each loop, I know that the label text property is, indeed, being changed, but it is not actually refreshing and updating on screen.
My delegate code is as follows (I grabbed this code off of another forum where people had the same issue - it seemed to work for them, but not for me):
Private Delegate Sub UpdatePMLabelTextDelegate(ByVal s As String)
Private Sub UpdatePMLabelText(ByVal s As String)
' Are we in the same thread as the label itself?
[Code].....
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Mar 22, 2010
Im trying to do this
[Code]...
But it will just skip to the last status (Label3.Text = "Status: Welcome")
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Apr 5, 2009
I am using a label to display a song for an mp3 player. I wanted to scroll the text inside the label for anything that is longer than the label width. I figured out the width of the label and if the width of the text inside the label is longer. But I have no idea how to turn this into subtracting parts/pixels of the text currently displayed and how to append the subtracted parts to the end of the new text.
Sub f1timer2tick()
Dim g As Graphics = f1l2.CreateGraphics
Dim s As SizeF
If f1l2.Text.Length > 19 Then
[code]....
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Aug 22, 2011
I have an animated gif that I would like to display in a picturebox while an operation on the main thread is being performed. The obvious issue here is when the operation is executing on the same thread as the picturebox, the animation stops until processing is complete. Is there a way to refresh the picturebox on another thread?I would really like to solve this using the same form as opposed to displaying another progress form.
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Jun 5, 2012
I have a UserControl inside UpdatePanel, how to update the user control when clicking a button
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Jul 3, 2009
I am using a timer with 1 second interval, that calls a function (for example) to download a file. So every one second the following happens in the timer.
label1.text = "File " & fname & " downloaded"
label1.refresh
call processfile(fname)
' only if i use application.doevents label refreshes properly.
Now inspite of using refresh, the label does not refresh properly. For example: for the new text you may see the entire text but if the older one has few extra char then you see that also. in other words you see new text and part of the old text. I am so surprised as to why is this happening.In vb6 when we used to use refresh the label used to refresh properly.
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Jan 29, 2011
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim total As Single
[code].....
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Mar 24, 2011
I have an aspx page which is made of 3 user controls (ascx). I have an update panel wrapping the 3 user controls like this:
<asp:UpdatePanel ID="UpdatePanelWrapper" runat="server">
<ContentTemplate>
<uc1:UserControl1 ID="UserControl1" runat="server" />
[code].....
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Feb 27, 2012
We have an existing VB.net application. Upon an event, we need to open a browser window. I'm able to open the browser window like this:
System.Diagnostics.Process.Start("http://s3web01/suggestions?item=" + strItem + "&co=" + strOrder)
Upon another event, we need to refresh the browser window with different parameters for strItem and strOrder.
If I call the same code above, it opens a new tab in the browser window. Is there any way to refresh the same browser window that was previously opened?
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Dec 17, 2011
Private Sub DataGridView1_CellClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellClick
If e.ColumnIndex <> 3 Then
Exit Sub
[code]....
I am using the CellClick event to update DB column PaidStatus from Paid to Un-Paid and vice-versa....Once updated i want the updated data to be reflected..i am using DataGridView1.Refresh()....but it does not show the updated data from the DB..i have to close the application and re launch it to see the changes.
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Dec 11, 2009
I have a VB.NET application and a timer that refreshes the webbrowser every 5 seconds on the application. Now it works 100% fine with Windows Vista. It also works fine on another computer that has Windows XP. But when i come to run this application on my server that has Windows XP installed the application will just not refresh. Is there anything that i can do to code it to FORCE refresh the browser every 5 seconds?
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Mar 23, 2010
I have a for loop condition as below coding for looping to change word on label.text, but as a result, it just only display the last value.
how can I do to display each value for a looping.
i want the result is the label1.text to show 1 then 2, then 3, then 4.......finally is 10.
for i as integer = 0 to 10
label1.text = i
next
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Aug 20, 2009
I have a label called lblMessage. The data of the message is saved in a SQL Server 2005 DB. In my table i have a message ID and then 4 rows with my message ID. Message 1, Message 2, Message 3 and Message 4.I want my lblMessage to go through a loop every time the user refresh his browser, so that when he refresh it once the next message will be Message 2 and so on and so on.How would i do this in VB.NET or C#?
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Sep 4, 2009
1. I am closing the form which started the thread inside the thread. There are no errors , but Is it safe ?
2. The thread starts at click of a button . If same button is clicked again , the thread is aborted. Should the thread be made Background or foreground ? it is working either way.
my code :
Private Sub BtnOk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnOk.Click
m_Thread = New System.Threading.Thread(AddressOf MyFunction)
m_Thread.IsBackground = True
[code]....
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Nov 3, 2011
I am trying to create a new instance of a form if its not allready been created the only problem is is that the instance creation is inside a worker thread.[code]...
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Jul 5, 2011
I have a backgroundworker that is downloading data from different webpages and process them to a datagridview.I get the Cross-thread operation not valid error on the first For loop.
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
dim i as integer
tot = (numPostnrTo.Value - numPostnrFrom.Value) / 10
[code]....
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Jan 14, 2009
Is it possible to create a new instance of the webbrowser class inside of a worker thread?
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Jan 10, 2009
Im trying to write a program that has a thread and the text of the label should be updated every 100 milliseconds. I have the following code but it doesn't work.
Private Sub ThreadTask()
Dim i As Integer
i = 0
[code]....
I get this error message if I run the program:Cross-thread operation not valid: Control 'TimeLabel' accessed from a thread other than the thread it was created on.
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Apr 22, 2010
I had followed the Example on mulit-thread in MSDN, but add a loop in my implementation. But seems like the multi-thread is not working.
Private
Sub
SboE_Start_Btn_Click(ByVal
sender As
System.Object,
[code]....
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May 27, 2011
I have a class that creates a ticker whose tick event checks somes stuff for me. If I instantiate the object and call the methods it works just fine. however if I create a new thread and call the function then the tick event doesnt get called for some reason.
Calling the object/creating thread:
Dim checkObj = New checkOutLook
checkObj.delForm = Me
[Code].....
why it would have problems handling an even tick on a separate thread? I even added a MessageBox output in the ticker to be able to check that its working properly
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Aug 20, 2010
I am trying to make my first program in vb.net 2010, and I have a question.ou know how when you have a button, the text centers itself within the frame of the button?I have a label in my application, that displays a different text (through the label) everyday.
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Jan 3, 2012
I'm trying to create a bunch of labels during runtime that will be "inside" a picture box, so when I move them, if their new coordinates are outside the box's dimensions they wont display, or if they're right on the edge of the box only half the label will be visible etc.
I thought label.Parent = picturebox would work but it doesn't seem to do anything, and Google keeps telling me to set the label's container to the picturebox - which sounds right, but maybe it's no longer a VB.NET thing since the Container property seems to be Read Only.
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Oct 8, 2011
I need to save a picture box to the hard disk with some text labels inside it.
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May 2, 2012
I Use a thread to send an email. I need write text in a label to let user know when email was send in a form of budgets.' Option Strict is off Function on class form.
Public Sub ChangeLblText(ByVal msg As String) ' LblIconos.modifiers = public (In form)
lblIconos.Text = msg
End Sub
Declarated class of new thread. (Global declared.)
Public TasksPresu As New TasksClassPresu()
An Icon of Form "Presupuestos" trigger the thread
Dim Thread1 As New System.Threading.Thread(AddressOf TasksPresu.TaskEmail)
Thread1.Start()
Class Trigged thread
[code]....
When run this make an error in this line: lbliconos.text = msg Error: "Illegal operation through threads. It had access to the control "lbliconos" from a thread other than that which was created"
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Nov 2, 2011
I've been programming in vb.NET for a whileAnd to be honest, its turning out to be a real pain.Here is the
Form1.vb: Imports System.Threading
Public Class Form1
Dim trd As Thread[code].....
So, I have a form (form1) with a label on, this label simply reports the status of the thread.The thread begins the Class1.Main() sub, and I have a delegate setup to change the text propoerty of the label.Now,I know the label is created on the UI thread,so I assumed the delegate would work. However,it seems that it updates the .text property, but doesnt redraw the control when .Update() is called .What am I doing wrong?I have found lots of examples of delegates, but all run from within the same class. I want to use threads too, not a backgroundworker! This code is a "simplified" version of a project I am on, which is encountering the same problems
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May 1, 2012
I Use a thread to send an email. I need write text in a label to let user know when email was send in a form of budgets.
' Option Strict is off
Public Sub ChangeLblText(ByVal msg As String) ' LblIconos.modifiers = public (In form)
lblIconos.Text = msg
End Sub
[code]....
I tried Invoke metods, delegate functions and adress of form without work, may be i left something.
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Jun 8, 2010
I run a thread from my main form that do some stuff i want that each action that the thread do will be written on a lable on the main form. How can i do that? I try to give it a pointer of the form but with no luck since its not allowed by the compiler. here is how i create the thread object in my form:
[Code]...
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Mar 29, 2010
Well to simplify it, whenever I use sendkeys from a background thread it just doesn't work. I even created a textbox, button, and backgroundworker with the following code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
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Aug 5, 2009
I have a background thread that calls a subroutine with the following inside it. I'm assuming the thread is messing with this part since it doesn't return anything.
Dim ctl As Control = Me.GetNextControl(Me, True)
Do Until ctl Is Nothing
If TypeOf ctl Is TextBox And ctl.Enabled = True And ctl.Tag <= 36 Then
[Code]....
I just called the sub that this is in without using the thread and it works fine, so it is the thread. How can I get this working inside a background thread?
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Oct 19, 2011
I'm trying to validate a form to be filled out by the users, and when the required section isn't filled, I increment an
ErrorCount += 1
variable to show that error(s) have occurred inside the program, I then also set an
ErrorArray()
to whatever the corresponding field number is, now I have 0-12 (13 fields). What I have also done is titled the labels that are associated with all of these fields to correspond with the ErrorArray() value that might be set, such as.
PatLabel0
PatLabel1 etc.
What I am trying to do is loop through the array contents, depending on which ErrorArray() values have been set, to go and set the corresponding fontcolor property of that label to red, to show that these now need to be filled out. This is what I have, but Visual Studio doesn't allow me to use the iteration through the loop as a reference to changing properties. Can anyone point me in the right direction to trying to figure this out, or at least tell me what else I could do. Just seems doing 20 if....then....else.... statements with 2 - 3 lines in each of them is redundant when 1 function line could do the same job. This is what I have.
for i = 0 to UBound(ErrorArray(12))
if(ErrorArray(i) = "*")then
PatLabel(i).forecolor = color.red
[code]....
that is basically all im looking for initially, but I can't do it.
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