backgroundworker

问题 In my website i have a database intensive page which i cache for 5 mins. But still the performance is hit when the cache expires and the page has to be rendered freshly. I was thinking why not compute the page from a background process(like workling) once in 5 mins and store it in the cache and let the user request be serve from the cache everytime. And as a result no user have to wait for this page to be rendered. Is there a efficient way to do it? Any help very much appreciated. Thanks, 回答1

问题 I am having a little trouble with getting the backgroundworker to update my progress bar. I was using a tutorial online as an example, but my code is not working. I did some digging on this site and I can't find any kind of solution. I am new to the backgroundworker/progress thing. So I don't understand it fully. Just to set things up: I have a main form (FORM 1) that opens another (FORM 3) with the progress bar and a status label. my Form 3 code as is: public string Message { set {

问题 I have a DataGridView on a winform. I am dynamically adding DatagridViewButtonColumn in the load method of form with button name as btnAction and text displayed on it as "Process". So, every row in the grid would have this Process button in the last column. On click event of this button, I am using a BackgroundWorker to call a method which does some calculations. Once the calculations are over, I need to update that clicked button's text as "Processed" in that row in the grid. How do I

问题 I have written code to save an image which is generated by the application. The size of the image is around 32-35 MB. While saving the image to a BMB file, it is taking a long time, around 3-5 secs. For this purpose, I have used a background worker but when running the background worker, it shows an error like..."can't access the object as it is created on different thread". Following is the code: private void btnSaveDesign_Click(object sender, RoutedEventArgs e) { Microsoft.Win32

问题 how to cancel background worker after specified time in c# or cancel not responding background worker. 回答1: Check out this tutorial: http://www.albahari.com/threading/part3.aspx In order for a System.ComponentModel.BackgroundWorker thread to support cancellation, you need to set the WorkerSupportsCancellation property to True before starting the thread. You can then call the .CancelAsync method of the BackgroundWorker to cancel the thread. 回答2: BackgroundWorker does not have support either

问题 I'm using a backgroundworker for showing a loadingscreen. The DO-event looks as follow: private void bwLoadingScreen_DoWork(object sender, DoWorkEventArgs e) { _ls = new LoadingScreen(); _ls.Show(); while (!bwLoadingScreen.CancellationPending) { Application.DoEvents(); } } I use the following code to Dispose the Loadingscreen: if (_ls.InvokeRequired && !_ls.IsDisposed) { Invoke(new MethodInvoker(delegate { _ls.Close(); _ls.Dispose(); })); } else if (!_ls.IsDisposed) { _ls.Hide(); _ls.Dispose(

问题 So I create multiple BackgroundWorkers using loop: foreach (var item in list) { worker = new BackgroundWorker(); worker.DoWork += worker_DoWork; worker.RunWorkerAsync(item); } Now I just can't figure how do I check that all those workers finished their job ? Thanks. 回答1: You may keep a list of active workers and let each worker remove itself when finished: List<BackgroundWorker> workers = new List<BackgroundWorker>(); ... foreach (var item in list) { worker = new BackgroundWorker(); worker

问题 Actually, i need to prompt a loading image throwugh backgrounderworker, whenever a particular function is been invoked here is my code : private void bgwFile_DoWork(object sender, DoWorkEventArgs e) { FormFieldsLoad(); } private void bgwFile_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (e.Cancelled == true) { Status.Text = "cancelled"; } else if (e.Error != null) { } picprocess.SendToBack(); Status.Text = "Completed"; } //Below Method where i have called

问题 I have been using in a WinForms C# application BackgroundWorkers to do any WCF service data calls like below: private void Worker_DoWork(object sender, DoWorkEventArgs e) { switch (_workerType) { case "search": Data.SeekWCF seekWcf = new Data.SeekWCF(); _ds = seekWcf.SearchInvoiceAdmin(new Guid(cboEmployer.Value.ToString()), new Guid(cboGroup.Value.ToString()), txtSearchInvoiceNumber.Text, chkSearchLike.Checked, txtSearchFolio.Text, Convert.ToInt32(txtYear.Value)); seekWcf.Dispose(); break;

问题 My code works but I am in doubt of what I did because i set CheckForIllegalCrossThreadCalls to false which I think would give some side-effects to my backgroundworker. Here is my sample code: Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = False End Sub Private Sub go_Click(sender As Object, e As EventArgs) Handles go.Click Try If BackgroundWorker1.IsBusy <> True Then BackgroundWorker1.RunWorkerAsync()