Solved

Responsive WPF UI

Posted on 2014-01-22
3
287 Views
Last Modified: 2014-02-18
I ahve a WPF application not implementing any mVVM.
I have  button click event, where I would like to show a progress Image, and then start a background thread to get some data.
In the background thread when the data has ben retrieved, I want to hide the Progress image.

  private void Button_Click(object sender, RoutedEventArgs e)
        {          
           
            //imgProgress.Visibility = System.Windows.Visibility.Visible;
            Application.Current.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal, new Action(
                delegate()
                {
                    imgProgress.Visibility = System.Windows.Visibility.Visible;
                              }));
         
            StartBackgroundThread();
         
        }

 public void StartBackgroundThread()
        {
            BackgroundWorker bgWorker = new BackgroundWorker();
            bgWorker.WorkerSupportsCancellation = true;
            bgWorker.DoWork += new DoWorkEventHandler(bgWorker_DoWork);
            bgWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgWorker_RunWorkerCompleted);          
            bgWorker.RunWorkerAsync();
        }

        void bgWorker_DoWork(object sender, DoWorkEventArgs e)
        {
       
            BackgroundWorker bgWork = (BackgroundWorker)sender;
            if ((bgWork.CancellationPending == true)) { e.Cancel = true; }
            else
            {
                GetData(0;
            }
        }

 void bgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
imgProgress.Visibility = System.Windows.Visibility.Hidden;
}

THE UI freezes when the data retrival takes a long time, so does the Progress image.
0
Comment
Question by:countrymeister
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 23

Expert Comment

by:wdosanjos
ID: 39802027
Try making bgWorker a private class variable instead of local.  This will prevent it from being GC, which might be causing the behavior you described.
0
 
LVL 1

Accepted Solution

by:
countrymeister earned 0 total points
ID: 39806864
Tried that but it did not help
0
 
LVL 1

Author Closing Comment

by:countrymeister
ID: 39866902
Please close this question, no expert helped
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question