Hi, I am a beginner with WPF and trying a home project to become familiar with the technology. I have a simple form where the user selects an image file, I then display EXIF data along with a thumbnail of the image. This is working fine but when I select a RAW image file (~9 MB) there can be a slight delay while the thumb loads, so I ...
Here's what I'm trying to solve: My class (which could be hosted by an UI app or a windows service or whatever), needs to receive windows messages. Somewhere around here, someone gave the suggestion (and some source code) to create a windows form in a separate thread that will create the form and whenever a windows message that I'm inte...
Hello all, I am trying to create a login form. The problem that I am having is that the login process is taking too long and is locking up my GUI. I have read up on background worker, but I am still uncertain on how to have my program wait for the login process but not freeze my GUI. Here is my code to help explain it more. Login.cs ...
Hi... There is a sequence for FORM(some UI) should get downloaded using service. Currently, this download is in a BackgroundWorker Thread. Now, since the performance is slow... We decided to categories the FORMS into 2 and start downloading parallely using another BackgroundWorker on top of the existing Thread. Now, the scenario is t...
I am using 5 BackgroundWorker objects running at the same time for a certain purpose, and all of them have to change the same label. How do I do that ? How do I modify the form from more than one thread then ? And how do i do it in case i want to change a public string ? ...
for (do it a bunch of times) { while (backgroundWorker1.IsBusy && backgroundWorker2.IsBusy && backgroundWorker3.IsBusy && backgroundWorker4.IsBusy && backgroundWorker5.IsBusy) { System.Threading.Thread.Sleep(0001); } if (!backgroundWorker1.IsBusy) { ba...
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...
Each time my code needs to talk to the network or a database I use a backgroundworker, can I use too many, what is the correct way of doing these tasks? If I don't use a background worker the gui locks up if a remote host is down etc so using a backgroundworker is the only way I know to fix this. I'm self taught so I'm learning as I g...
I have a simple program that has backgroundworkers, and it runs with no stop, and no matter when I close it, it will always have some still running (or all of them) and I've noticed that closing the application doesn't completly kill it. After running it some times, there are processes (1 for each run) that remain on the process tab of t...
I have 15 BackgroundWorers that are running all the time, each one of them works for about half a second (making web request) and none of them is ever stopped. I've noticed that my program takes about 80% of my computer's processing resources and about 15mb of memory (core 2 duo, 4gb ddr2 memory). It it normal? web requests are not hea...
I'm having some problems using a backgroundworker in a WPF app. Here's the situation: I'm trying to do two things. First scanning a number of images and then use barcode recognition on the scanned images. I'm retrieving the scanned images as a list of BitmapSource objects and these should be available to my backgroundworker thread. Aft...
For instance, a thread that is a BackgroundWorker, can be cast like: private void worker_DoWork(object sender, DoWorkEventArgs e) { System.ComponentModel.BackgroundWorker senderWorker = sender as System.ComponentModel.BackgroundWorker; } The code above represents what I have for my Background worker th...
Ok this may be really simple but everything I try just seems to hit a brick wall. I have a view model with two properties, which are bound to my WPF form: bool IsWorking {get;set;} ObservableCollection<OtherViewModel> PendingItems {get;set;} I have a method that I call to fetch some new pending items from outlook, however I also wh...
Hi, I have a method which is worked asynchronous by a BackgroundWorker. Within this method, some code loops infinitly with an interval of 1000 ms. Within this code, depending on some value, an event is dispatched. As far as I have understood this, this event runs in the same thread as the code from which it has been raised. But what...
Hello all, I am trying to build a small application that logins into a server and gathers data from it constantly. The problem that I am having is that my GUI is slow to respond even when using either background worker or a thread. When my application tries to login into the server, I see "(Not Responding)" appear in my login form, but ...
Hi, I have to do 3 async operations parallely inside a Windows NT Service (using .Net2.0/C#). For that I am using Backgroundworker component. Is it a good option/approach? For continuous operation, I am calling RunWorkerAsync() again in RunWorkerCompleted event. Please suggest me. ...
Learning to build multithreading WPF applications I read about some restrictions in using BackgroundWorker that was not very clear for me. Please, help me to understand: If I want not only one thread working behind the scene of UI, but maybe several ones, starting and ending independently one from another, will the BackgroundWorker fit...
Has anyone tried TwainDotNet for scanning with TWAIN API calls from .NET? Though it works well usually I've some issues with it when used along with WPF application using MVVM. Basically I'm calling Twain scanning functions from a Service, which in turn uses a BackgroundWorker. List<BitmapSource> bitmapSources = new List<BitmapSource>()...
I am designing an application which has the potential to hang while waiting for data from servers (either Database or internet) the problem is that I don't know how best to cope with the multitude of different places things may take time. I am happy to display a 'loading' dialog to the user while access is happening but ideally I don't ...
In a WPF app I have a sheduled database access task, periodically run by a timer and this task have been executed in a BackgroundWorker thread. When connection attempt failed I raise an exception by try_catch construction and I want to update a Status Bar text in a UI thread. Is there some prebuild event construction in a BackgroundWo...