CODEWITHSUNDEEP
wpfdrag-and-drop
Néstor Sánchez A.
Néstor Sánchez A.

Reputation: 3978

Why my WPF application has Drag & Drop disabled (even when AllowDrop is true)?

My WPF application inhibits the Drop of files from Windows Explorer, showing a Stop-sign cursor.

I've tried setting the AllowDrop property (that of the UIElement ancestor) to true on the main window and contained controls, but no luck at all, no drag-drop events are fired.

Any ideas or suggestions to find the cause?

Upvotes: 21

Views: 13470

Answers (3)

stambikk
stambikk

Reputation: 1365

In my case it was running Visual Studio as Administrator on Windows 10. The UAC prevented the drag/drop. When I ran VS without elevating drag/drop started working in debug mode.

Upvotes: 20

aliceraunsbaek
aliceraunsbaek

Reputation: 665

According to this: http://codeinreview.com/136/enabling-drag-and-drop-over-a-grid-in-wpf/ (Which I am happy to report works!)

All you need to do is add a background on the control that has to get the drop. This will enable hit testing and thus make the drop-feature work.

Note: The background can be transparent, you just have to set it.

Upvotes: 8

Néstor Sánchez A.
Néstor Sánchez A.

Reputation: 3978

Solved!

The problem was that executing my app thru VisualStudio (run/debug) prevented the interop with Windows' drag & drop mechanism. Running the App as stand-alone makes it work, but cannot debug interactively.

This answer helped a lot: Visual Studio 2010 WPF Project ran in debug or relase will not allow drag and drop to any control

Upvotes: 26

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