How to download image in WPF Image control?

aluzi liu 486

The Image control's "Source" prpoerty, if pass it a url address, Image control can auto download image from web server and display it, that's pretty cool.
But in real world, my web server require authentication, in this case, Image control can not download image it'self.

So my question is, how to pass the authentication data to Image control?
If can't do this, I want to create custom "Image" inherit from Image control, how to override it's download process?

And, if ListBox contains thousands item, how to detect a ListBoxItem is visible or not(out of current ListBox viewport)?
Beacuse I don't want to download all item's image at the samtime.
I want download the image only when the item is visible(like the user scroll ListBox, the item below became visible to user).

Hui Liu-MSFT 38,251 Reputation points Microsoft Vendor

2022-09-15T07:57:59.26+00:00

Hi,@aluzi liu . For downloading images in a web server with authentication, you could try the solutions here to see if it helps you. For downloading a large number of images in ListBox, you can try UI Virtualization by referring to here.
aluzi liu 486 Reputation points

2022-09-18T05:12:49.11+00:00

Thanks! I will check it out.
Hui Liu-MSFT 38,251 Reputation points Microsoft Vendor

2022-09-27T04:29:07.627+00:00

Hi,@aluzi liu . Is there an update to your question? Has the problem been solved? If solved, please share the solution. Happy to help if you still have questions.