c# - DragDropEffect.Copy Resets itself to None -

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i have scatterviewitem in scatterview, manipulation not handled me. have richtextbox in scatterview, property allowdrop = true.

by default, richtextbox's dragenter event fires whenever scatterviewitem drag it, correct. checked dragdropeffect here, , it's dragdropeffect.move. drop event fires appropriately after that.

i changed dragdropeffect move copy in dragenter, drop event no longer fires. checked dragdropeffect again in dragover , somehow became none. tried setting in dragover copy (again) each time become none on next trigger of dragover.

the time drop event fire if dragdropeffect set all or move. how change dragdropeffect.copy , still fire drop event? did set e.handled = true after setting dragdropeffect.copy.

edit: apologises, did manipulate svi's drag , drop little. in scatterview's onmanipulationstarted, svi , called svi.begindragdrop(svi.datacontext). that's did svi.

what (drageventargs).allowedeffects property value? can set (drageventargs).effects property 1 of values specified (drageventargs).allowedeffects property. if dragdropeffects.copy not option found in (drageventargs).allowedeffects property enumeration, not able use function.

you can set option when create data object , call dodragdrop:

dragdrop.dodragdrop(item, dragdata, dragdropeffects.all);

update >>>

as said, normally, set allowable dragdropeffects enumeration when call dodragdrop... after seeing have called surfacedragcursor.begindragdrop method, looked online @ surfacedragdrop.begindragdrop method page @ msdn , found this:

public static surfacedragcursor begindragdrop (     frameworkelement dragsource,     frameworkelement draggedelement,     frameworkelement cursorvisual,     object data,     ienumerable<inputdevice> inputdevices,     dragdropeffects allowedeffects )

i'm guessing last parameter here set dragdropeffects allowable effect enumeration.


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