Re: How to create responsive drag and drop experience even if lots of processing is required

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

If you're using the 2.0 runtime take a look at the BackgroundWorkerThread
for doing your decryption. You can put a placeholder on the drop target
while the files are being decrypted and get an asyncronous notification of
the process progress and notification.



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"Gunnar" <sundfar@xxxxxxxxxxxxxxxxxxx> wrote in message
news:OAx8klcoGHA.2268@xxxxxxxxxxxxxxxxxxxxxxx
I have a winforms application that can encrypt and unencrypt files. I want
to support drag and drop files out to Windows Explorer.
In my current version I unencrypt my files in the MyListview_ItemDrag
Event, build an array of files and call DoDragDrop() with
DataFormats.FileDrop.
This works, but I'm concerned about this architecture. If a user starts to
drag several files from my listView and all of these files are really BIG.
It can take some time to unencrypt these files and place them in a
directory. Meanwhile the application thread is busy and the application
seems unresponsive to the user.

As far as I know, no DragDrop-like Event will trigger in my code when I
drop in an external app like Explorer. So is there no way to postpone the
time-consuming part (unencrypting files) to the DragDrop part when the
user releases the mouse button??

I hope I'm wrong. Any tips, suggestions?
Regards, Gunnar Sundfar



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