I've gone through this http://stackoverflow.com/questions/246058/system-invalidoperationexception-the-object-is-currently-in-use-elsewhere-ho but it didn't help. The case here is different. I'm using Backgroundworkers. 1st backgroundworker starts operating on the image input of user and inside firstbackgroundworker_runworkercompleted() ...
I have spent the whole day trying to make my application use threads but with no luck. I have read much documentation about it and I still get lots of errors, so I hope you can help me. I have one big time consuming method which calls the database and updates the GUI. This has to happen all the time(or about every 30 seconds). public c...
I have created an xbap front end that brings data from an sql server and displays them. A BackgroundWorker is responsible for this communication, in order for the UI to remain responsive during the query. Everything works as expected on my machine when debugging. Then I publish the project on a network drive, and it still behaves as exp...
How do I report change of the CountValue from this class to a backgroundworker class SomeOtherClass { public void CountUp() { int CountValue; for (int i = 0; i < 100000000; i++) CountValue = i; } } Here is the implemetation of the DoWork function private void backgroundWorker1_DoWork(object ...
Say I have the following class/Form (semi psuedo): public partial class X : Form { private DataTable dt; private BackgroundWorker bg; public X() { dt.Columns.Add("A"); dt.Columns.Add("B"); dt.Columns.Add("C"); } private void button_Click(...) { bg = new BackgroundWorker(); ...
how does it knows when to/not to marshal call to the UI thread in it's progresschanged event handler? I know SynchronizationContext.Current can do the trick, but this property is only set in the main UI thread, what if the backgroundworker is created on another background thread? Can anybody kindly explain? ...
I have a Windows Form and a class with two simple methods that run recursively in a nondeterministic way (meaning that it's unknown which recursion will be called, both can call the other)... Now, there are some points during that recursion at which I want to pause the execution and wait for a user to click on the "Next Step" button. Onl...
In the last question http://stackoverflow.com/questions/1952201/display-progress-bar-while-doing-some-work-in-c, people has recommend use of BackgroundWorker. I thought in BackgroundWorker DoWork method you can update the GUI directly, but why this function call need to be called using Invoke. toolTip.SetToolTip(button, toolTipText); ...
I'm in the process of writing a asynchronous-operation manager somewhat similar to the BackgroundWorker class. I know that the BackgroundWorker does some internal voodoo (using the AsyncOperation class, from what I've read) to fire its events on the thread that created the BackgroundWorker, which is typically a UI thread. My question is...
I already searched the forum but no asked question fits to my problem I think ... I use a BackgroundWorker to handle a very time consuming operation. After this operation finishes a button should be set to enabled so that the user can perform another operation. I'm using WPF and I'm following the MVVM pattern, so I have no direct acce...
I'm using a BackgroundWorker to perform a long computation (only one such computation at a time). The user has the possibility of cancelling the worker (calling worker.CancelAsync). In the worker.DoWork method I periodically check for the cancel pending flag and then return from the method. Then the Completed event is raised from the ...
Hello. I have an application wherein two threads write asynchronously to a single textbox. It works, except that the second thread to write to the textbox overwrites the line that the first thread just wrote. Any thoughts or insight into the problem would be greatly appreciated. I am using Microsoft Visual C# 2008 Express Edition. T...
I got a .net WinForms application. I have a UserControl which gets instantiated based on user action - upon instantiation, it performs some time-consuming tasks on a background thread (using BackgroundWorker), while displaying the ajaxy spinning animation. The user can click away at anytime, then click back onto the user control (which...
Hi, I'm gonna create a BackgroundWorker with an anonymous method. I've written the following code : BackgroundWorker bgw = new BackgroundWorker(); bgw.DoWork += new DoWorkEventHandler( () => { int i = 0; foreach (var item in query2) { .... .... } } ); But Delegate '...
Is BackgroundWorker in c# Thread Safe? The reason I ask this is because I get a Controls created on one thread cannot be parented to a control on a different thread exception with it. This is my DoWork event code: private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { var openFile = document.Open(My...
What is the best practice for setting up a background process that runs every 10 minutes in a WinForm project? Is it to use a backgroundworker off of the form? Or is there a more generic way that would apply to many more project styles? Maybe some code I should call right before the line: Application.Run(new Form1()); ...
I asked a similar question here; thanks to everyone who provided suggestion! However, it seems that my problem is bigger than the one described above, so I am posting a new question. The issue is that I need to keep my UI responsive when I am loading a large document using a third party control called document. The document is a class e...
I have a BackgroundWorker object that I instantiated to perform a DB process on a background thread ansynchronously. I have event handlers for DoWork and RunWorkerCompleted. I can tell that the BackgroundWorker is disposing of itself because I added a message box into the Disposed event handler. My question is this: Is it necessary t...
I am trying to create a simple Network Tool to ping all possible IPs on your local subnet and provide a list of such IPs in a DataGridView. I am new to having to consider threading which is a good thing to come across as a budding programmer. Sorry, but you are probably going to have to do some explaining to me, but in my mind this sho...
I have an application that pings every possible IP on your local subnet in order to compile a list of responsive IP addresses. Currently it pings all 255 one at a time. Is it possible to convert this app to use multiple threads to increase the speed by pinging more than one at a time? I am new to the concept of multiple threads and fi...