Drag & Drop event, WPF vs WinForm

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I got this weird problem in Drag & Drop events, that I cannot figure out.

I am trying to make Drag & Drop work in my plain simple WPF application.
If I Drag a Contact Card from Microsoft Lync 2010 to my WPF program, then I am not allowed to.

There is no "DragEnter", "DragOver" or "Drop" event in my WPF application.
But if I do a Drag & Drop from applications like Word, Internet Explorer or Google Chrome it works fine. I get "DragEnter", "DragOver" and "Drop" events.

The wired part come now. If I do the same in a WinForm application, it works as expected when I do a Drag & Drop of a Contact Card from Microsoft Lync.

I feel, I need to setup something up in my WPF application, perhaps some low level debugging ?

- In my WPF and WinForm I have set "AllowDrop" to true
In "DragOver" event, I have set e.Effects = DragDropEffects.Copy and e.Handled = true.

Posted 28-Nov-12 20:22pm

Kim Togo

Updated 22-Oct-18 0:26am

v3

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[no name] 14-May-18 23:21pm

Maybe WPF doesn't "recognize" the "Contact Card".

Word docs, Excel sheets, HTML docs are practically "universal"; not some "Contact Card".

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earloc · Answer 1 · 2012-11-28T20:56:00

Solution 1

what did you try? when you say "no DragEnter event, etc. in you application", where did you look at?

A Window, for instance, has events such as "DragEnter", "DragLeave", etc. but they won't get raised if "AllowDrop" is set to false. Is that your problem?

EDIT1: accidently posted this as solution - it was intended as comment...

Posted 28-Nov-12 20:56pm

earloc

Updated 28-Nov-12 22:07pm

v2

Comments

Kim Togo 29-Nov-12 3:10am

In my WPF I have set "AllowDrop" to true, and have hookup all events on "DragEnter", "DragOver", "DragLeave" and "Drop"

In my "DragOver" event, I have set e.Effects = DragDropEffects.Copy and e.Handled = true.
But still no "DragEnter", "DragOver" events is triggered, WHEN I do a Drag & Drop from Microsoft Lync.

If I do a Drag & Drop from Internet Explorer, it works as expected.

earloc 29-Nov-12 3:25am

Ok, that sure seems weird. But the complete Drag&Drop behavior is a chapter of it's own since the beginning...WPF, sadly, does nothing to make this event-hazzle a bit more programmer friendlier (at least not OOTB).
I would check if the DragDropEffect your are setting is supported by the Lync-Drag operation (e.g. by examining the AllowedEffects-property of the DragEventArgs).

Also try to hookup to the GiveFeedback-event.

Sorry i can't help more on this issue.

Kim Togo 29-Nov-12 4:03am

Hi Earloc
I very much appreciate your help.

And about "I would check if the DragDropEffect your are setting is supported by the Lync-Drag operation (e.g. by examining the AllowedEffects-property of the DragEventArgs)."

My problem is, that no Drag events are generate in my WPF application. But in WinForm it works.

Kim Togo · Answer 2 · 2018-10-22T00:27:00

Solution 3

The solution to this problems was an update to Microsoft Lync 2010 from Microsoft.

Posted 22-Oct-18 0:27am

Kim Togo