Visual Studio 2010 WPF Project ran in debug or rel

问题:

I had started a question here: WPF drag and drop files onto TreeView from windows explorer but I just discovered this is a totally different problem that what I thought it was.

I have an extremely simple test case.

I was using a treeview but if I use a simple listbox with no code just the following xaml

<StackPanel Orientation="Vertical">
    <ListBox Height="312" Background="#FFBDD6FF" AllowDrop="True"/>
</StackPanel>

If I run the project in expression blend and drag a file over the listbox I see the arrow and the little square below it that incdicates you can drag and drop.

If I run the same project in visual studio and drag a file over the listbox I get a black circle with a line through it.

What could be wrong with my computer or code that is causing that?

回答1:

Is it possible that you are running Visual Studio as Administrator and Expression Blend normally?