BackgroundWorker - Spawn Dialog While Log Event Occur
Apr 10, 2010
I am trying to create a background worker that will spawn a dialog, while a long event is occurring. For example, when the main thread in trying to connect connect to a db and update a large amount of records, I would like to have the background worker spawn a dialog that advises the user to "Please Wait"
Here is what I have so far
1. I create a background worker using the drag and drop
2. Before the event that taking a long time starts I call:
Me.BackgroundWorker1.RunWorkerAsync()
BackgroundWorker1.WorkerReportsProgress = True
3. This is the events for the bgworker, all of which was enabled in the form designer:
Private Delegate Sub delCreateNewForm()
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
Dim d As New delCreateNewForm(AddressOf CreateNewForm)
Me.Invoke(d)
[Code] .....
4. When the long activity is completed I call this:
BackgroundWorker1.ReportProgress(0)
Everything seems to work fine, except that the newly spawned dialog in no responsive and appears to be frozen, until its closed by the Progress Changed event.
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Dec 11, 2009
Private Sub done_Click(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles done.Click
Dim s As Integer = ComboBox1.SelectedIndex
Dim t As Integer = ComboBox2.SelectedIndex
Dim x As Integer
[code].....
When i go for r <> 0 then it occur twice.
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Apr 20, 2012
To get the row index of DataGrid when change(asp:radiobuttonlist) occur in row of the TemplateColumn
<asp:DataGrid ID="dgTier2" runat="server" AutoGenerateColumns="False" Width="578px"
Height="83px" OnItemDataBound="dgTier2_ItemDataBound">
<asp:BoundColumn DataField="TypeID" HeaderText="TypeID">
</asp:BoundColumn>
[code]....
After changing the rediobutton selection to get the Rowindex of the changed row.if at all change happens in many rows i need make the collection of the Rowindexs.
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Apr 14, 2011
I have a long running process running in a backgroundworker, and want it to report progress to the user, and update a checked listbox as the items are discovered. The reportprogress is called, and the statements executed (placing a break in the reportprogress routine), I can see the control valuse change, but the change is not reflected in the dialog. Here is the reportprogress routine I'm using:
Private Sub BackgroundWorker2_ProgressChanged(ByVal sender As System.Object,
ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker2.ProgressChanged
Me.newlabel.ForeColor = Color.Cyan
[code]....
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Apr 12, 2012
In my windows application, I want to check which part of code (or routine) has caused un-handled exception event to occur from application events in its running mode (not debugging).
If this is possible then please guide me how to do this.
If any clarification regarding this is required,
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Feb 1, 2012
I'm seeing some strange behavior where the RunWorkerCompleted event for one of two threads I start isn't being called depending on how I call them. Check out the code below, and the two methods of firing the threads, good() and bad().
[Code]...
In both cases the DoWork event is called for both threads. But in the bad() case, only the second thread fires the RunWorkerCompleted event. This is obviously due to the two different ways I'm using VB to handle events here. I'm looking for an explanation of this behavior, preferably with a link to some documentation that could help me understand how these events are being handled in VB better. It seems strange to me that just reusing a variable name here seems to either dispose of the thread before it's done or else just make it stop firing events.
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Feb 9, 2012
I've started working with the backgroundworker class to try and keep the UI responsive while I make some expensive API calls. One of the API classes (details here[msdn.microsoft.com]) has its own event handler which I am using to update a progress bar in a small form that pops up. So I'm looking to use the PublishPackage command in a bgw thread and update a progress bar on the UI thread by using the ProgressHandler method.
[Code]...
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Sep 22, 2010
I have seen others with a similar issue but not quite what I was looking for. In the backgrounderworker class dowork event I create an instance of a new class and call one of it's function. Previously, I had this code in a windows.form.timer tick event and would pass a delegate in as one of the parameters which would allow the function and other functions it calls within the class to call a method on the form to update a datagrid on the GUI. Is there a way to do this within the dowork event? I need this because the function I call from dowork calls other functions and I want each of those functions to log information in the GUI datagrid.
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Jun 17, 2010
I am trying to display the progress bar(marque) in a separate form (progressForm) while i do some calculation in background. I know the typical way of doing it is to include the calculation in background worker and show progressForm in main thread. This approach how ever will lead to lot of synch issues in my application hence I am showing the progressForm using progressForm.ShowDialog() inside the background worker process. But I need to trigger the Completed event with in the application to close the form.
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Jan 15, 2012
my current solution as you can see is by using shared variable within a class in order to pass a value.
on the form load of my application i called: workerSample.RunWorkerAsync
Dim finalList As List(Of String)
Private Sub workerSample_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles workerSample.DoWork
[Code].....
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Aug 30, 2010
Before anything else I did try to use the search option, but it continuously failed to load.Most I have figured out but I am unsure of how to spawn Types and Sockets.
Example:
VB6 -
Dim TypeArray() As ThisType
Type ThisType
[code]....
well that was easy! But it has me stumped in vb.net, I hear using system.net.socket is the most efficient way to use sockets so I would like to spawn those.I need to be able to control which index is assigned to which socket, as each index will refer to certain variables.
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Nov 16, 2011
I have a BackgroundWorker in a vb.net program that is doing a lengthy data import routine. I want to modify its RunWorkerAsync method so that it fires a custom event on completion of the method. (So that a method in an automated process can respond to the event and resume its work). In a sense I want to 'extend' the RunWorkerAsync method to add an extra line of code--but I can't 'see' the code in the method (to just add the line raising the event) because BackgroundWorker is an MSDN class from Microsoft.The only solution that I can think of is to 'wrap' the background worker class in a wrapper that calls the .RunWorkerAsync method and then raises the event.
Public sub wrapperMethod()
myBackgroundWorker.RunWorkerAsync()
raise customEvent
end sub
Is there a design pattern that I might use? An easy way to address this with the .net language?
PS: Unfortunately, I'm automating some clanking legacy software and backgroundworker is used in many locations, so wrapping the backgroundworker will be a bit of work and may open bugs.
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Oct 6, 2010
Let's say a custom exception is thrown in the DoWork event for a backgroundworker. How do I pass the custom exception to the backgroundworker so that it ends up being the e.Error in the RunWorkedCompletedEventArgs?
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Dec 20, 2009
I have a button named cmd_Grunt and a picture box named pb1_Grunt. I want to click the button and have a picture box created.
"Public Class Form1
Dim grunt = (50)
Private Sub cmdGrunt_Click(ByVal sender As System.Object, ByVal e As
[Code].....
This is the code I have so far. I get an error message, "Expression expected." It wants the expression between "CreateObject" and "('pb1Grunt', grunt))".
ie cmdGrunt_Click(CreateObject HERE ('pb1Grunt', grunt))
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Nov 11, 2011
when a tank cannon shoots, what I want is make the shell come out on the tip of its cannon. The same thing when the cannon is facing on a different angle.I only know the rotation thing but not these trigonometric function I am looking for.
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Apr 1, 2011
I actually have gotten the events firing like I expect except for trying to close the dialog window.
Background: I have a wrapper around my "Jabber Client" that sets the delegates for the client wrapper and basically generates a messageProcess event. This event is wired in the main program Class[code]...
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Nov 14, 2011
I tried to update the button text on a form from a backgroundworker.do_work event, and it failed, with the usual cross-thread exception message.However, by pure chance, I also tried to update text in a system.windows.form.toolstripstatuslabel also from this backgroundworker.do_work event, and it DOES work. Question: why is this? Is it perhaps because theres some kind of implicit shared behaviour with system.windows.form.toolstripstatuslabel?
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Dec 14, 2009
in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
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Nov 28, 2011
I know about user controls and custom controls, but I want to build a control like the Open File Dialog or Event Log Components that don't have UI and just pop to the bottom of the form like the OFD. How do I do this?
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Dec 30, 2009
I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below
[Code]...
However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.
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Aug 7, 2009
I'm having an interesting issue that I can't reproduce on a different project, but can consistently on this one. I have no clue what might be causing it, but am hoping that someone may have seen it before.
I have a main form, from which I run a series of checks. On this form, I have a listview control. Because of some issues with the refreshing of this listview control, I had to create my own messagebox. It's just a form that displays some text ( it also happens to look nicer than MsgBox; in my opinion, anyways ). It's been working great for months, until recently.
My problem is that on my main form's load event, I run this check, which returns an error within a try/catch block. I then call my custom messagebox with a message. It in turns calls it's ShowDialog() function.
In any other situation ( after the main form has been loaded ), I have no problems. The messagebox goes on the screen and behaves appropriately ( ie: waits for my input and acts as a modal dialog ( stops execution of my main form's thread ) ). However, on this onload event, my messagebox comes up and goes away almost immediately afterwards.
I've traced it all the way to the showdialog() call. For no explicable reason, it appears to skip right over this call, without me doing anything on the form.
Here's what the inner trace looks like ( when I put a breakpoint on the onclosing event for this messagebox form ):
CODE:
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Mar 15, 2012
In my application, i have put a question on form closing if the user wants to save the changes?. But right now, i have just put it in default whether they make changes or not.I thought of prompting it on text change.. but the text automatically changes on load as it retrieves data from sql server.
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Mar 25, 2012
What is the code that I can use to describe what happens when there is not just one exception in a'Try...Catch..Finally...End Try' statement? For example: 'Catch' is used to describe what happens when a certain exception occurs, but what can I use to describe what happens when a certain exception does NOT occur?
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Nov 27, 2010
Is there some interface I can implement to allow basic comparisons and math to happen as it would an integer?
For example, let's say I have the following class:
Public Class Something
Public SomeBigNumber as UInt64
End Class
I would like to do something like this:
Dim SomethingA, SomethingB, SomethingC as New Something
....
If (SomethingA-SomethingB) > SomethingC Then
'Do stuff
End If
I was hoping to be able to implement some interface (if that is even the right term for it) that would return the UInt64 contained in the class for comparison and math, if possible.
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Oct 22, 2009
me and a partner need to play sounds when certain events occur, however, every method we try..
My.Computer.Audo.Play("file.wav")
or?
Sound.PlayWaveFile("file.wav") from this class: http:[url]....etc they all don't work
They do NOT throw any exceptions, they just dont play the music, the test demo of the Sound Class works like a charm, its just not working in our project..same with My.Computer. Audio. Play.what could we have done to make it so that we can't play sounds from our application?
PS: this problem occurs on all of the computers we test it on, yet the normal sound-playing methods seem to work on all of those computers when they are implemented in other projects.. its just not working in these instances
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Jun 12, 2012
Here is my drop down list and data source. My question is.. when is it possible to set a defaulted selected option for the drop down list, aka when have all the dropdownlists been databound and their ListItems populated? I have tried Page_PreRender, age_PreRenderComplete, Page_Load.I have read over MSDN's Page Life cycle event which suggest Page_PreRender.
<asp:DropDownList ID="ddlRampStandard" runat="server"
DataSourceID="RampStandardDataSource" DataTextField="StandardName"
DataValueField="StandardName" RepeatDirection="Horizontal"
[code].....
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Feb 11, 2012
I am making a program that is sort of a frontend to all my other apps. I put the EXEs of those apps into the resources of my frontend. The problem occurs when I try to run the EXEs from memory.
I keep getting System.Reflection.TargetInvocationException on the line:
entryPoint.Invoke(RuntimeHelpers.GetObjectValue(objectValue), New Object() {New String() {"1"}})
[code].....
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Jun 4, 2009
I have a simple desktop application that uses a .NET setup project (.msi file) to perform the installation. On the first installation, everything proceeds in a timely fashion with good feedback for the user.The problem occurs when the user is installing the latest version of the application over an old version on their machine.There is an unacceptably long delay of about 60 to 180 seconds from the time the installer's 'Welcome' dialog [It's not the Welcome dialog, I've removed that from the Start section of the setup project and replaced it with a CheckBox dialog to ask if the user wants a shortcut on the desktop] disappears until the 'Progress' dialog appears. The user sees minute(s) of blank screen and thinks the install has stopped or failed.
In the setup project properties, I've got the 'DetectNewerInstalledVersion' and 'RemovePreviousVersions' properties set to true. So, I believe that while nothing appears to be happening, the installer is actually removing the old version. The 'Progress' dialog does not appear until the new version begins installation.I've been trying to either:
a) Get the 'Progress' dialog to display immediately after the 'Install Icon' dialog disappears
b) Show another dialog while the Uninstall is running to let the user know that the setup is still running and everything is OK.
I have been unsuccessful with both methods. I'm using VS 2008 SP1?
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Nov 11, 2009
Can I create new dialog results for my dialog forms? And then use them with Form.ShowDialog method?
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Nov 16, 2010
Is there a way to launch a Modeless Dialog that stays active even when a Modal Dialog is launched? Can I put the Modeless Dialog in a seperate Thread or something like that?
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