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Outlook 2010 issue. Drag-n-drop onto a custom task pane causes Selection.Count to grow RRS feed

  • Question

  • Hello,
    We have an issue reported by our customer. I reproduced the issue in the project described below.
    The project. The project is downloadable here, file size = 16 969. This is an Outlook 2010 add-in project in VSTO 2010. The code in ThisAddin.vb:
    Public Class ThisAddIn
        Private WithEvents explorer As Outlook.Explorer
        Private ctp As Microsoft.Office.Tools.CustomTaskPane
    
        Private Sub ThisAddIn_Startup() Handles Me.Startup
            explorer = Application.ActiveExplorer()
            ctp = Me.CustomTaskPanes.Add(New UserControl1(), "Title")
            ctp.DockPosition = Microsoft.Office.Core.MsoCTPDockPosition.msoCTPDockPositionRight
            ctp.Visible = True
        End Sub
    
        Private Sub ThisAddIn_Shutdown() Handles Me.Shutdown
            Me.CustomTaskPanes.Remove(ctp)
            System.Runtime.InteropServices.Marshal.ReleaseComObject(explorer)
        End Sub
    
        Private Sub explorer_SelectionChange() Handles explorer.SelectionChange
            Dim selection As Outlook.Selection = explorer.Selection
            System.Diagnostics.Debug.WriteLine("!!! selection.Count=" + selection.Count.ToString())
            Dim res As Integer
            res = System.Runtime.InteropServices.Marshal.ReleaseComObject(selection)
            System.Diagnostics.Debug.WriteLine("!!! res=" + res.ToString())
        End Sub
    End Class
    

    UserControl1.vb
    Public Class UserControl1
    
        Private Sub UserControl1_DragEnter(sender As System.Object, e As System.Windows.Forms.DragEventArgs) Handles MyBase.DragEnter
            e.Effect = Windows.Forms.DragDropEffects.All
        End Sub
    
        Private Sub UserControl1_DragDrop(sender As System.Object, e As System.Windows.Forms.DragEventArgs) Handles MyBase.DragDrop
    
        End Sub
    End Class
    

    InitializeComponent in UserControl1.Designer.vb:
        <System.Diagnostics.DebuggerStepThrough()> _
        Private Sub InitializeComponent()
            Me.SuspendLayout()
            '
            'UserControl1
            '
            Me.AllowDrop = True
            Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
            Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
            Me.Name = "UserControl1"
            Me.ResumeLayout(False)
    
        End Sub
    

    The issue. Start Outlok 2010 SP 1 32-bit. In the explorer window, drag an item onto the custom task pane; you may be required to drop one more item. Now start selecting items and check the selection.Count. The result: selection.Count grows while you select new items. The expected behavior: selection.Count should return the number of items actually selected in the explorer.
    In my tests, the Navigation pane was Normal, the To-Do Bar was Normal, the Reading pane was Off.
    Note. If the Reading Pane is shown, it freezes after drag-n-drop. Because we reported the Outlook team about Reading Pane freezing after drag-n-drop in Outlook 2010 32-bit a while back, the current issue seems to be just another manifestation of the same bug. However, I didn't test the current issue in Outlook 2010 64-bit, sorry.

    Regards from Belarus (GMT + 2),

    Andrei Smolin
    Add-in Express Team Leader
    Monday, September 26, 2011 3:12 PM

All replies

  • Hi Andrei.  I've notified the product team.
    Eric Legault
    MVP (Outlook)
    About me...
    Monday, September 26, 2011 6:07 PM
  • Hi Eric,

     

    Would you please share the Connect link for us? It will be very beneficial for all of the community members who interesting in it to track the process of it.

     

    Have a good day,

     

    Tom


    Tom Xu [MSFT]
    MSDN Community Support | Feedback to us
    Get or Request Code Sample from Microsoft
    Please remember to mark the replies as answers if they help and unmark them if they provide no help.

    Thursday, September 29, 2011 9:02 AM
  • I was never given a Connect link, as I don't think the Outlook team ever files anything there.  I was told that it's a known issue.  You can follow up with Teresa Thomas if you like.
    Eric Legault
    MVP (Outlook)
    About me...
    Thursday, September 29, 2011 2:57 PM
  • Hi Eric,

    Thanks for your clarify.

    Have a good day,

    Tom


    Tom Xu [MSFT]
    MSDN Community Support | Feedback to us
    Get or Request Code Sample from Microsoft
    Please remember to mark the replies as answers if they help and unmark them if they provide no help.

    Friday, September 30, 2011 3:14 AM
  • Hello everyone,

    We've found a solution for this problem. Find a shared add-in project demonstrating the solution in Outlook, custom task pane and drag-drop problem on the Add-in Express blog.


    Regards from Belarus (GMT + 3),

    Andrei Smolin
    Add-in Express Team Leader

    Please mark answers and useful posts to help other developers use the forums efficiently.

    Monday, March 26, 2012 3:54 PM