VS 2005 Brackground Worker For XML File
Apr 17, 2009I want to use the background worker with my XML file i'm reading plus a progress bar....
how can I get the maxvalue of the progress bar? this will depend on how many nodes there are.
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VS 2005 - Error - Using A Background Worker To Read A XML File And Do Stuff In A Database
May 6, 2009I'm using a background worker to read a XML file and do stuff in a database i get nothing in debugger but when i run it i get this error... how can i find out where and what is wrong? Exception has been thrown by the target of an invocation.
View 6 RepliesVS 2005 UI Freezing / Background Worker?
Aug 11, 2011I've been trying to figure out what is going on with this code, but it looks like I need some help. The issues I'm having is when I click a button that executes my background worker, it freezes and the UI comes back once the listview control is populated.My guess is that some part of my code under the backgroundworker_dowork function is trying to update something on the UI thread causing it to freeze. I just can't figure out what is trying to call the UI.
The user is supposed to click a add server button and enter the server name. The server name will be added to the ListView control. When they click refresh, the background worker is executed which attempts to get the DNS name, IP Addresses, and online/offline status.
Obviously, I'd like to run this code without freezing the UI. Does anyone have any idea on why this might be happening? My guess is because the ListViewItems are passed to the background worker and still have a reference to the control running on the UI thread. Am I right with this statement? If so, how do I change my code to get rid of that reference?
VS 2005 Calculating Time Using Background Worker
Apr 17, 2010I have a button which on click will save the data into the database and after successful entry of data a messagebox will be displayed.Now,all i want to do is I want to calculate the time of how long does it take between clicking the button and displaying the messagebox.
View 19 RepliesVS 2005 Class Api Needs To Get A Handle On Form Elements In The Main Worker Thread
Sep 4, 2009I have a standard windows application called winap. I have a com component which acts as an api to the winap. I have a class in winap call classapi which has all the methods that the api calls and all works well. The problem is that one of the methods in my class api needs to get a handle on form elements in the main worker thread. Whenever I try to access an existing form I keep getting null because the for exists in the main worker thread and my api call is in a seperate thread.
[Code]...
WPF Background Worker Not Recognizing Worker Object
Mar 11, 2009I have the following code that adds a background worker into a VB.net WPF project:
Imports System
Imports System.ComponentModel
Imports System.ComponentModel.BackgroundWorker
[Code].....
And I get the following error for the DoWork worker event:
Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
It seems like it's missing something in the Event declaration, but can't find it.
Copying Large File With Background Worker?
Aug 30, 2010I'm trying to browse for a large file and copy it with a background worker but get the folling error:"Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process."
Code:
Private Sub BW_CopyEXE_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BW_CopyEXE.DoWork
Dim fullFilename As String
[code]....
Read .doc File To Textbox With Background Worker?
Aug 12, 2010read .doc file to textbox with background worker?
View 1 RepliesUploading A File Using A Background Worker Class
Apr 16, 2009I am having difficulty uploading a file using a background worker class...I've noticed that it is unable to transfer files like "mp3" ".exe" and others...although my application works fine on ".txt" and '.doc" and similar types otherwise it throws the following error following is my code for FTP...Also would like to know that the builtin FTP libraries are capable enough to make a FTP class application with RESUME capability? my files can be huge like 80MB to 100MB. [code]
View 3 RepliesVS 2010 - Want Background Worker To Use File Copy?
Aug 17, 2011i want background worker to use file copy, how?
View 1 RepliesStore PDF File Into Sql Server 2005 And Display In A Picture Box On VB 2005 Window Form?
Mar 13, 2009I am using memorystream to get and store images into sqlserver 2005 table image field. This process is working and I am able to display image in picture box. I need to be able to store PDF files into the same field and be able to display in a picture box.
View 2 RepliesUsing A Background Worker?
Jul 15, 2011I'm writing an application in Visual Basic Express 2008, part of the function being to walk through a folder structure starting from a user specified folder. In my research, I found this thing called a background worker which seemed an appropriate tool to use given the potential size of a target folder structure. I successfully installed the two examples from the library here, and believe I understand the principles involved. Even so, having tried to build this feature into my application, it seems as though it is not working as expected, and, as predicted, debugging a multi-threaded application is a pain in the extremity.
I have this fragment under my "start" button click event -
HomeSource.Enabled = False
HomeCopy.Enabled = False
HomeReport.Enabled = False
[Code].....
What Is A Background Worker
Jul 18, 2010im thinking just because an app has been sent ton system tray does not mean its a "back ground worker"
View 1 Replies.net - Progress Bar With Background Worker
Jun 7, 2012my backgroundworker as I just cant get it to work. Basically I have a backgroundworker which does a few tasks but I'm trying to implement a progress bar and a label. I'm going to set the maximum value of the progress bar to 10 and then have it updating as I move with each task, also I'm thinking of a label with the progress bar which will display the progress ie
[Code]...
Add Progress Bar With Background Worker
Oct 7, 2009I'am trying to make app that will show every file in C:[code]Now how can i add progress bar with the background worker.
View 31 RepliesBackground Worker RunWorkerCompleted?
Nov 20, 2008I have a background worker that used to fire its RunworkerCompleted event when its DoWork routine finished querying a database and writing its output to a file. The bg worker was in a class called Query, which was called from another class called Trigger. A new Trigger Class was created for each monitored event. In this class, there was a structure which stored the config of each Trigger. When this event was triggered (set to TRUE) a new query class is created and it is passed the Trigger class. When the database query, file writing was done, the query class and all its rsources were diposed from the RunWorkerCompleted EventRecently I changed the application so that a new trigger class is not created for each monitored event. There is a single instance of the class but new config structure for each event. When a particular event is trigger, jsut the config structure is passed to a new query class and the sma ething is done in the query class. I just noticed now that the RunWorkerCompleted event is not being fired anymore.
View 5 RepliesBackground Worker And A For Loop?
Apr 15, 2009I have an issue that I can't seem to find a straight answer for anywhere... I have a For loop that sends a file name to a background worker that contains some long running code and I can't find a way for the parent thread to wait for the background worker to finish... Here is the example code:
For 4
BacgroundWorker1.RunWorkerAsync(fileName(i))
Next
[code].....
Background Worker In Vista Vs XP
Sep 21, 2009I have run into this before, When I develop a form to use a background worker to fill tableadapters, the background worker does fine on machines running Vista, but if you run the same thread on an XP machine, the thread gets hung.All the thread is doing is filling a table adapter like this.[code]Why would this run on a Vista machine and not an XP machine?
View 1 RepliesBackground Worker Not Working Right?
Apr 27, 2010I have created a background worker to go and run a pretty long task that includes creating more threads which will read from a file of urls and crawl each. I tried following it through debugging and found that the background process ends prematurely for no apparent reason.
While Not myreader.EndOfData
Try
currentRow = myreader.ReadFields()
Dim currentField As String
[code]....
This first bit of code is the loop to input from file and this is what the background worker does. The next bit of code is where the background worker creates threads to work all the 'landingPages'. After about 10 threads are created the background worker exits this sub and skips the file input loop and exits the program.
Try
For Each landingPage As String In landingPages
pgbar.Timer1.Stop()
If VisitedPages.Contains(landingPage) Then
[code]....
Also my main thread runs a forms from where this background is called to run but the main thread is supposed to wait for the background process to end unless the user selects another option from the main form.
Background Worker With Several Forms
Jan 11, 2012I've been experimenting with background worker to maintain responsiveness and to allow the UI to update while things are being done in the background.I've been having problems getting the background worker to do anything with form controls.For simplicity lets say I have form1 and form2.The background worker is on form1Initially I couldnt get it to edit controls on form1 but by using [code]However the problem came when I tried to get the same background worker to update controls on form2, in this case a text box. With the above code there is no error but it also does not update the text box.Is there an easy way to give a background worker access to multiple forms.
View 4 RepliesError On Worker Thread
Dec 27, 2009I have some class that splits some work onto multiple worker threads. To be more specific: the class represents a download, that can have as many segments as the user wants, that get then put onto separate threads.When I run the download with one segment, it works fine. When I run it with 2 segments, the second segment encounters an error.[code]When I put a breakpoint on the if, it'll stop there, but when I go to the next line, I get an error.I don't get what's getting wrong, and got a headache after a few hours of attempting to keep track of the correct thread.Anyone an idea what's going wrong, or how I can detect it better? (This is the first time I'm doing real multi threading debugging.
View 4 RepliesHow To Kill A Background Worker In .net
Mar 10, 2011i m trying to kill a background worker in the do work event of the worker i was using
backgroundworker.CancleAsync()
but its shows an error saying tat CancellationPending does not allow
how can i kill a background worker after its work gets completed in its do work event
How To Know If Background Worker Is Already Cancelled
Dec 30, 2011currently, i have this code: My_BgWorkerB is the Name of my BackGround Worker
If My_BgWorkerB.IsBusy Then
If My_BgWorkerB.WorkerSupportsCancellation Then
My_BgWorkerB.CancelAsync()
[code].....
Pause A Background Worker?
Apr 16, 2009Is there a way to pause a background worker? What I need to do is pause a background worker when it encounters a file error, wait for a few seconds, and then carry on.
View 2 RepliesProgress In A Background Worker
Jun 7, 2012I have a backgroundworker which does a few tasks but I'm trying to implement a progress bar and a label. I'm going to set the maximum value of the progress bar to 10 and then have it updating as I move with each task, also I'm thinking of a label with the progress bar which will display the progress ie [code]
View 3 RepliesRun A Function As A Background Worker?
Jun 6, 2010I have a function it is called ReLoad()
How can i run it as a background worker? so it can run in the background where it does not effect my current running function - basicly so the form will not freeze at all.
Updating UI From Worker Thread
Oct 27, 2009This is slightly different to just updating a UI from a worker thread. The object which calls the thread, calls another object, and it is this object which is is trying to update the UI. It doesn't however work.
Imports System.Threading
Public Class Form1
Public Delegate Sub GetText(ByVal sText As String)
Public GetSomeText As GetText
Public Sub New()
' This call is required by the Windows Form Designer.
[Code] .....
Use The Backround Worker As An Array?
Jan 3, 2011use the backround worker as an array. For instance, i load the listview with email names and the passwords and was wanting to send email from each one as a test.
View 1 RepliesUsing Progress Bar With Background Worker In VB?
Jun 12, 2011I am developing a VB application along with MS Access... When I initially load my form I need to put my application to sleep for 3 seconds or else data wont load properly. So for this 3 seconds I would like to show a progress bar displaying a message "Please wait" I tried using background worker but did not find any success... I have gone through many tutorials but for some reason could not accomplish the task.
View 4 RepliesVS 2008 Background Worker?
May 7, 2010I'm new for VB.Net 2008. I am facing some problem about how to make the multiple groups activities running (it might concurrent) based on their own activity's time set? For example: If there is 80 groups and 100++ activities in each group, can i use background worker (create 80 background worker?) to handle this (each background worker handle their group activities.) if in this case (But it will running lag or hang)
View 14 Replies
