c# - Determine in code whether to allow a dragdrop drop using the Silverlight Toolkit -


i'm using silverlight toolkit implement drag/drop functionality in silverlight 4 web application. drag source listbox, , i've got eighteen potential drop targets. need allow/disallow dropping based on string value on dragged object.

i have no problem doing comparison , determining whether or not item allowed dropped on target, however, i'm having trouble figuring out best event handle, , how make not accept drop.

i've looked @ dragenter event, , looks best place handle this, i'm not quite sure need make not drop. here's snippet of of code i've tried, doesn't prevent drop:

      lbdragdrop.dragenter += (src, e) =>           {               vaultsocketviewmodel vm = this.datacontext vaultsocketviewmodel;                listboxdragdroptarget target = src listboxdragdroptarget;                observablecollection<itemmodel> listboxbinding = vm.slots[target.name];                object data = e.data.getdata(e.data.getformats()[0]);                itemdrageventargs eventargs = data itemdrageventargs;               selectioncollection coll = eventargs.data selectioncollection;                 itemmodel newitem = coll.select(t => t.item).oftype<itemmodel>().firstordefault();                if (!target.name.startswith(newitem.itemslot))  // don't allow drop               {                   e.effects = microsoft.windows.dragdropeffects.none;                   e.handled = true;               }               else               {                }             };

just change effects none (like you're doing) should enough - example of internal code in treeview drag drop target in toolkit (the seteffects method)

http://silverlight.codeplex.com/sourcecontrol/changeset/view/57505#779753


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