The variable selectedPath consists of the path that was passed to the backgroundWorker1 earlier via the parameter txtPath. Text , it is being accessed via e. If you need to reset some controls afterwards, do it in the following way as already mentioned above :.
Using Lambda's makes it easy, as you could see in the code. And here's the complete example, which runs in LinqPad 6 just copy and paste it into an empty C Program query - I decided to use LinqPad this time so you can learn something new, because you all know how to create a new Windows Forms project in Visual Studio and if you still want to do so, just copy the events below and drag and drop the controls to the form :.
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How to update GUI with backgroundworker? Ask Question. Asked 12 years, 1 month ago. Active 1 year, 1 month ago. Viewed 94k times. Matt Mads Andersen Mads Andersen 3, 4 4 gold badges 35 35 silver badges 43 43 bronze badges. Why do you poke UI thread when there's a BackgroundWorker? I was having issues with report progress. ReportProgress p, param ;" in DoWork — rluks.
Add a comment. Active Oldest Votes. David Murdoch This throws an exception. Please see update - I have shifted the while loop into the single instance of the 'DoWork' method; this will allow you to push UI notifications via 'ReportProgress', and then if you like, you can add a method handler for the 'Completed' if you ever want to break out of your infinite loop This seems to work!
All this threading is now the cause of my animations between screens not working. I dont know why : But thats a whole new problem. Marked as accepted answer. Thanks : — Mads Andersen. Can't figure out why. Mike Marshall Mike Marshall 7, 4 4 gold badges 37 37 silver badges 62 62 bronze badges.
I think I have done this application quite clumsy. Having UI objects inside my controller objects. So I am not sure if this fits my program. There is also going to be alot of change if I am going to do this I think. Given that the original question is tagged wpf , I find this answer completely inapplicable.
RunWorkerAsync ;. Lee Lee k 20 20 gold badges silver badges bronze badges. A separate class on a separate thread updates a list box on the Form. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 9 years, 4 months ago. Active 9 years, 4 months ago. Viewed 14k times. Community Bot 1 1 1 silver badge. LordAro LordAro 1, 3 3 gold badges 14 14 silver badges 31 31 bronze badges. Add a comment. Active Oldest Votes. In your Winform class, have a public delegate that can update the controls. Invoke Form1. This would be good, however it involves passing 'this' as a parameter, and i have been lead to believe that if you have to do this, the structure of your program is bad.
I may be completely wrong though : — LordAro. You are right, it is not a good idea to pass 'this' as a parameter. Here, you are not passing 'this'.. This should answer the question. I wanted to add a warning because I noticed that some of the simple solutions omit the InvokeRequired check.
I noticed that if your code executes before the window handle of the control has been created e. Even if the operation is time-consuming thread. March 4, c Leave a comment. If there is a new record, I then want the script to store the entries from two sp What I am trying to achieve is when clicking on the button it should open a URL in a n Add menu.
InvokeMember propertyName, BindingFlags. Body as MemberExpression. IsSubclassOf propertyInfo. ReflectedType this. GetProperty propertyInfo. Name, propertyInfo. InvokeMember propertyInfo. Name, BindingFlags. Handling long work Since. LongWork progress , TaskCreationOptions. LongRunning ; label. Delay Wait ; progress. Report i.
Task instead of Thread. It uses the current SynchronizationContext from its creation place here the UI thread. LongRunning that hints to do not queue the task into ThreadPool. FailingWork progress ; button. Report "I will fail in Report 3 - i. ToString ; Task. NET 4: control. Fire and forget extension method for. This is the classic way you should do this: using System; using System. Forms; using System.
StartWork ; workerThread. The simple solution is to use Control. Sleep ; backgroundWorker1. ReportProgress 0, "A" ; Thread. ReportProgress 0, "B" ; Thread. Target as ISynchronizeInvoke; if target! Invoke d, Raise this, EventArgs. Empty ; Of course, you can also make use of the BackGroundWorker class, which will abstract this matter for you.
You can do that by calling Control. None of the Invoke stuff in the previous answers is necessary. Make sure you do not call BeginInvoke too frequently or it could overrun the message pump.
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