Help with ProgressBar
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Hi I'm having a bit of an issue with my progress bar in WPF. Let me first explain why I want a progress bar. I have a list of products that I save back to a database when clicking a Save button. Sometimes this list can contain quite a lot of items, and this takes a while to save. I use a for loop to loop through and save each item in this list. So what I want to do is increment the progress bar after each loop iteration. Is this possible? Below is what I tried doing but it only updates the progress bar after the loop has finished, even though I'm running it on a different thread:
for (int i = 0; i < someList.Count; i++) { //CODE SAVE LIST ITEM //CODE SAVE LIST ITEM new Thread(delegate() { UpdateProgress(100 / productPartsList.Count); }).Start(); }//end of for loop //UPDATE PROGRESS BAR METHOD public void UpdateProgress(double increment) { progressIncrement = progressIncrement + increment; Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { progressBar1.SetValue(System.Windows.Controls.ProgressBar.ValueProperty, progressIncrement); }, null); }Any hints? -
Hi I'm having a bit of an issue with my progress bar in WPF. Let me first explain why I want a progress bar. I have a list of products that I save back to a database when clicking a Save button. Sometimes this list can contain quite a lot of items, and this takes a while to save. I use a for loop to loop through and save each item in this list. So what I want to do is increment the progress bar after each loop iteration. Is this possible? Below is what I tried doing but it only updates the progress bar after the loop has finished, even though I'm running it on a different thread:
for (int i = 0; i < someList.Count; i++) { //CODE SAVE LIST ITEM //CODE SAVE LIST ITEM new Thread(delegate() { UpdateProgress(100 / productPartsList.Count); }).Start(); }//end of for loop //UPDATE PROGRESS BAR METHOD public void UpdateProgress(double increment) { progressIncrement = progressIncrement + increment; Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { progressBar1.SetValue(System.Windows.Controls.ProgressBar.ValueProperty, progressIncrement); }, null); }Any hints?Hi, I think you have to use another DispatcherPriority flag. Because : DispatcherPriority.Background means the enumeration value is 4. Operations are processed after all other non-idle operations are completed. So i would recommend you to use at least DispatcherPriority.Normal or you also could try DispatcherPriority.Render . Cheers Noodles
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Hi, I think you have to use another DispatcherPriority flag. Because : DispatcherPriority.Background means the enumeration value is 4. Operations are processed after all other non-idle operations are completed. So i would recommend you to use at least DispatcherPriority.Normal or you also could try DispatcherPriority.Render . Cheers Noodles
Thanks Noodles. That didn't help though, and I tried every priority available. Here's another code sample I tried: NOTE: This is called inside my loop, so it gets done for every loop iteration
System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(
delegate()
{
System.Windows.Threading.DispatcherOperation
dispatcherOp = prgbSave.Dispatcher.BeginInvoke(
System.Windows.Threading.DispatcherPriority.Render,
new Action(
delegate()
{
progressIncrement = progressIncrement + (100.0 / productPartsList.Count);
prgbSave.Value = progressIncrement;
}
));dispatcherOp.Completed += new EventHandler(dispatcherOp\_Completed); } )); thread.Start();This does the same :mad: The progressbar only gets updated after the loop has completed.
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Hi I'm having a bit of an issue with my progress bar in WPF. Let me first explain why I want a progress bar. I have a list of products that I save back to a database when clicking a Save button. Sometimes this list can contain quite a lot of items, and this takes a while to save. I use a for loop to loop through and save each item in this list. So what I want to do is increment the progress bar after each loop iteration. Is this possible? Below is what I tried doing but it only updates the progress bar after the loop has finished, even though I'm running it on a different thread:
for (int i = 0; i < someList.Count; i++) { //CODE SAVE LIST ITEM //CODE SAVE LIST ITEM new Thread(delegate() { UpdateProgress(100 / productPartsList.Count); }).Start(); }//end of for loop //UPDATE PROGRESS BAR METHOD public void UpdateProgress(double increment) { progressIncrement = progressIncrement + increment; Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { progressBar1.SetValue(System.Windows.Controls.ProgressBar.ValueProperty, progressIncrement); }, null); }Any hints? -
Hi I'm having a bit of an issue with my progress bar in WPF. Let me first explain why I want a progress bar. I have a list of products that I save back to a database when clicking a Save button. Sometimes this list can contain quite a lot of items, and this takes a while to save. I use a for loop to loop through and save each item in this list. So what I want to do is increment the progress bar after each loop iteration. Is this possible? Below is what I tried doing but it only updates the progress bar after the loop has finished, even though I'm running it on a different thread:
for (int i = 0; i < someList.Count; i++) { //CODE SAVE LIST ITEM //CODE SAVE LIST ITEM new Thread(delegate() { UpdateProgress(100 / productPartsList.Count); }).Start(); }//end of for loop //UPDATE PROGRESS BAR METHOD public void UpdateProgress(double increment) { progressIncrement = progressIncrement + increment; Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { progressBar1.SetValue(System.Windows.Controls.ProgressBar.ValueProperty, progressIncrement); }, null); }Any hints?The normal way to do this in a WPF application is to implement a background worker, where you'd save the items in your background thread, and you'd dispatch the updated progress values back to the calling thread which would update the progress bar.
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