backgroundworker

问题 Currently, I have a button that when the user clicks on it, it looks for a specific CD-ROM drive that is ready and contains a file. Sometimes, when the user clicks on a button, the button click is mouse down and the program hangs for an indeterminate time until the computer reads the CD-ROM drive. I made my progress bar but I noticed a few things: 1) The program hangs/freezes before the method that checks the cd drives gets called. So I can't set the progress bar to display when the method is

问题 Hi i have an App where one of the jobs will be convert an Excel and pass all the records to the DB. So this takes a little time because it's more than 7000 rows that i will get and insert into the DB. So because this job takes a little time, more than 3 minutes, I'd like to use a ProgressBar to report progress of this job. So if i am doing this Job in Class that i have created, how can i use the backgroundWorker to report the progress to the progessBar in my case? My objective is be accurate

问题 I am relatively new to .NET programming and multithreading in general, and was wondering if it is ok to use .NET provided BackgroundWorker to spawn off worker threads to do some work in a console application? From the various documentation online, I see that intent for this class is more for UI oriented applications, where you want to do some work in background, but keep the UI responsive, and report progress, cancelling processing if needed etc. In my case, basically I have a controller

问题 I am relatively new to .NET programming and multithreading in general, and was wondering if it is ok to use .NET provided BackgroundWorker to spawn off worker threads to do some work in a console application? From the various documentation online, I see that intent for this class is more for UI oriented applications, where you want to do some work in background, but keep the UI responsive, and report progress, cancelling processing if needed etc. In my case, basically I have a controller

问题 I have a WinForms application in which my background worker is doing a sync task, adding new files, removing old ones etc. In my background worker code I want to show a custom form to user telling him what will be deleted and what will be added if he continues, with YES/NO buttons to get his feedback. I was wondering if it is ok to do something like this in background worker's doWork method? If not, how should I do it? Please advise.. private void backgroundWorker1_DoWork(object sender,

问题 Below is a method that I want to ship off into a background worker but I am struggling how to do it based on how created my method. As you can it doesn't return anything which is ok but it expects a directoryInfo object everytime it is recalled. private void getSizeForTargetDirectory(DirectoryInfo dtar) { // generate a collection of objects. files comes first and then directories. foreach (Object item in collection ) { if (item == file) { track the size of the files as you encounter. } else

问题 I need to create queue and use it with BackgroundWorker. So I can add operations and when one is done next is starting in background. I found this code by google: public class QueuedBackgroundWorker<T> { public void QueueWorkItem( Queue queue, T inputArgument, Func<T> doWork, Action workerCompleted) { if (queue == null) throw new ArgumentNullException("queue"); BackgroundWorker bw = new BackgroundWorker(); bw.WorkerReportsProgress = false; bw.WorkerSupportsCancellation = false; bw.DoWork +=

问题 I was unable to find an answer to this question anywhere... What happens with the exceptions thrown in the callback method for System.Threading.Timer, (or in the event handler for System.Timers.Timer). Is the exception propagated to the thread on which the timer was created or is the exception lost? What are the side-effects of throwing an exception within the timer's callback functions? What would be the right way to signalize to the timer's creation thread that the exception in the worker

问题 I have a progress bar and backgroundworker in VB.Net that I would want to work in a different form as given below: Form1() { MaxRows = 10 for i = 0 to MaxRows then // Update my value on the progressbar .... next } ProgressBarForm Private Sub ProgressBarForm_Shown(sender As Object, e As EventArgs) Handles Me.Shown TransferProgressBar.Visible = True ProgressBarBackgroundWorker.RunWorkerAsync() End Sub Private Sub ProgressBarBackgroundWorker_DoWork(sender As Object, e As ComponentModel

问题 If I am in a function in the code behind, and I want to implement displaying a "Loading..." in the status bar the following makes sense, but as we know from WinForms is a NoNo: StatusBarMessageText.Text = "Loading Configuration Settings..."; LoadSettingsGridData(); StatusBarMessageText.Text = "Done"; What we all now from WinForms Chapter 1 class 101, is the form won't display changes to the user until after the Entire Function completes... meaning the "Loading" message will never be displayed