如何在后台线程中加载图像而不影响UI？

Question

I am fetching a number of images from the internet and loading into my winform. Everything works fine except for the time lag when the images are fetched from a slow connection. I want the images to be fetched in background but the UI should not become unresponsive.

I tried 'BackgroundWorker' but it didn't work. Is there any other way of doing this? I read about async calls but I am not sure if it will work for me.

Background Worker ::

 foreach(String str in images )
            {
              BackgroundWorker bw=new BackgroundWorker();
              bw.DoWork += (s, e) => { run(str); };  // 
              bw.RunWorkerAsync();
            }

and run() simply sets the image url to the picture box.

Answer 1

You can't make UI updates except from the thread you created the UI object on.

You can however use "Invoke" to make a call on the class's main thread.

Invoke( (Action)(() => { pictureBox.image = loadedImage; }) );