backgroundworker

Background worker does not Work WPF

大兔子大兔子 提交于 2019-12-24 13:13:05
问题 In my WPF program it took huge processing time and freezing for long time. so I decided to use background worker and process it in background. but it does not work. through debug, the program stop at Render3D() . It does not throw exception. Its like when you put return . In other word it does nothing after reaching Render3D() and will just return. (I don't say it will return Because im not sure but the behavior is same as return) private readonly BackgroundWorker backgroundWorker = new

Synchronous work in a BackgroundWorker

旧街凉风 提交于 2019-12-24 12:08:20
问题 My application performs time consuming work independently on several files. I created a BackgroundWorker to pass the work off to on each file, but it appears the backgroundworker is only capable of performing asynchronous work. Is it possible to do several asynchronous tasks in unison with it, or is there a similar object for performing synchronous operations? 回答1: The background worker is usually used to update the UI and/or to pass off work so you don't freeze the UI when a long running

android.app.RemoteServiceException: Context.startForegroundService() did not then call Service.startForeground( ) in React native

陌路散爱 提交于 2019-12-24 10:59:27
问题 I'm trying to create background service in Android Oreo using react-native-background-job but when I'll start the service is call success but Showing crash dialog service is stopped. please provide a solution for this problem. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { context.startForegroundService(starter); } else { context.startService(starter); } 回答1: You are not allowed to start background service using startForegroundService - if service doesn't elevate itself into the

What can I access from a BackgroundWorker without “Cross Threading”?

早过忘川 提交于 2019-12-24 05:16:14
问题 I realise that I can't access Form controls from the DoWork event handler of a BackgroundWorker. (And if I try to, I get an Exception, as expected). However, am I allowed to access other (custom) objects that exist on my Form? For instance, I've created a "Settings" class and instantiated it in my Form and I seem to be able to read and write to its properties. Is it just luck that this works? What if I had a static class? Would I be able to access that safely? 回答1: @Engram: You've got the

Handling multiple operations using BackgroundWorker

北城余情 提交于 2019-12-24 04:55:14
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. Now, how do i

ASP.NET - Get website's URL without HttpContext.Current (running in background thread)

风流意气都作罢 提交于 2019-12-24 04:00:50
问题 Bit of a long shot, but is there a way in ASP.NET to dynamically get the website's URL (http://www.example.com) when there is no HttpContext.Current available. There is no HttpContext because the code is running in a background thread* (but under the ASP.NET AppDomain). I have a background process that sends emails out every evening, and needs to include the Web address, but I don't want to hard code it because of deployments and testing (it changes from http://localhost:12345 to http:/

C# Can't close form created by Background Worker

半城伤御伤魂 提交于 2019-12-24 01:25:46
问题 My Backgroundworker loads a new "pop-up" form, but how do I terminate background worker and the newly created form? private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { BussyForm bussyForm = new BussyForm(); bussyForm.ShowDialog(); } This has no effect: backgroundWorker1.Dispose(); backgroundWorker1.CancelAsync(); backgroundWorker1 = null; 回答1: You shouldn't be showing a form from a non-UI thread. You should only have one UI thread, and it, and only it, should access all

C# winform backgroundworker

我是研究僧i 提交于 2019-12-24 00:42:12
问题 I am currently working on a home project for myself. The program is written in C# using winforms. The problem I'm currently experiencing is as followed: I have a listview in my mainform called lvwGames When I run the program without debugging, it runs fine. However when I start with a debug, I get an error. This has something to do with the background worker thread. Allow me to post some code to assist me. private void MainViewLoad(object sender, EventArgs e) { RefreshGamesListView(); }

Diffrernce between BackgroundWorker.ReportProgress() and Control.BeginInvoke()

∥☆過路亽.° 提交于 2019-12-23 21:13:04
问题 What is the difference between options 1 and 2 in the following? private void BGW_DoWork(object sender, DoWorkEventArgs e) { for (int i=1; i<=100; i++) { string txt = i.ToString(); if (Test_Check.Checked) //OPTION 1 Test_BackgroundWorker.ReportProgress(i, txt); else //OPTION 2 this.BeginInvoke((Action<int, string>)UpdateGUI, new object[] {i, txt}); } } private void BGW_ProgressChanged(object sender, ProgressChangedEventArgs e) { UpdateGUI(e.ProgressPercentage, (string)e.UserState); } private

Check to see if a thread in another form is still running

瘦欲@ 提交于 2019-12-23 20:23:35
问题 I have a Windows Form application that involves two Forms. The child form is used to export data into CSV files, and uses a background worker to write the file. While this is occurring I have the form hidden. The parent form is still active while the background worker is running, so the user can exit the application, even when the background worker is writing files. On the parent form I have added a FormClosing event handler to prompt the user if a background worker is still running. The